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/*
* $Id: JXGraph.java 4147 2012-02-01 17:13:24Z kschaefe $
*
* Copyright 2006 Sun Microsystems, Inc., 4150 Network Circle,
* Santa Clara, California 95054, U.S.A. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
package org.jdesktop.swingx;
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Cursor;
import java.awt.Dimension;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.RenderingHints;
import java.awt.Stroke;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import java.awt.event.MouseWheelEvent;
import java.awt.event.MouseWheelListener;
import java.awt.geom.GeneralPath;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.text.DecimalFormat;
import java.text.NumberFormat;
import java.util.LinkedList;
import java.util.List;
import org.jdesktop.beans.AbstractBean;
import org.jdesktop.beans.JavaBean;
import org.jdesktop.swingx.painter.Painter;
// TODO: keyboard navigation
// TODO: honor clip rect with text painting
// TODO: let client change zoom multiplier
// TODO: improve text drawing when origin is not on a multiple of majorX/majorY
// TODO: programmatically zoom in and out (or expose ZOOM_MULTIPLIER)
/**
* JXGraph provides a component which can display one or more
* plots on top of a graduated background (or grid.)
*
* User input
*
* To help analyze the plots, this component allows the user to pan the
* view by left-clicking and dragging the mouse around. Using the mouse wheel,
* the user is also able to zoom in and out. Clicking the middle button resets
* the view to its original position.
*
* All user input can be disabled by calling
* {@link #setInputEnabled(boolean)} and passing false. This does not prevent
* subclasses from registering their own event listeners, such as mouse or key
* listeners.
*
* Initializing the component and setting the view
*
* Whenever a new instance of this component is created, the grid boundaries,
* or view, must be defined. The view is comprised of several elements whose
* descriptions are the following:
*
*
* - minX: Minimum value initially displayed by the component on the
* X axis (horizontally.)
* - minY: Minimum value initially displayed by the component on the
* Y axis (vertically.)
* - maxX: Maximum value initially displayed by the component on the
* X axis (horizontally.)
* - maxY: Maximum value initially displayed by the component on the
* Y axis (vertically.)
* - originX: Origin on the X axis of the vertical axis.
* - originY: Origin on the Y axis of the horizontal axis.
* - majorX: Distance between two major vertical lines of the
* grid.
* - majorY: Distance between two major horizontal lines of the
* grid.
* - minCountX: Number of minor vertical lines between two major
* vertical lines in the grid.
* - minCountY: Number of minor horizontal lines between two major
* horizontal lines in the grid.
*
*
* View and origin
*
* The default constructor defines a view bounds by -1.0 and
* +1.0 on both axis, and centered on an origin at
* (0, 0).
*
* To simplify the API, the origin can be read and written with a
* Point2D instance (see {@link #getOrigin()} and
* {@link #setOrigin(Point2D)}.)
*
* Likewise, the view can be read and written with a
* Rectangle2D instance (see {@link #getView()} and
* {@link #setView(Rectangle2D)}.) In this case, you need not to define the
* maximum boundaries of the view. Instead, you need to set the origin of the
* rectangle as the minimum boundaries. The width and the height of the
* rectangle define the distance between the minimum and maximum boundaries. For
* instance, to set the view to minX=-1.0, maxX=1.0, minY=-1.0 and maxY=1.0 you
* can use the following rectangle:
*
* new Rectangle2D.Double(-1.0d, -1.0d, 2.0d, 2.0d);
*
* You can check the boundaries by calling Rectangle2D.getMaxX()
* and Rectangle2D.getMaxY() once your rectangle has been
* created.
*
* Alternatively, you can set the view and the origin at the same time by
* calling the method {@link #setViewAndOrigin(Rectangle2D)}. Calling this
* method will set the origin so as to center it in the view defined by the
* rectangle.
*
* Grid lines
*
* By default, the component defines a spacing of 0.2 units between two
* major grid lines. It also defines 4 minor grid lines between two major
* grid lines. The spacing between major grid lines and the number of minor
* grid lines can be accessed through the getters {@link #getMajorX()},
* {@link #getMajorY()}, {@link #getMinorCountX()} and
* {@link #getMinorCountY()}.
*
* You can change the number of grid lines at runtime by calling the setters
* {@link #setMajorX(double)}, {@link #setMajorY(double)},
* {@link #setMinorCountX(int)} and {@link #setMinorCountY(int)}.
*
* Appearance
*
* Although it provides sensible defaults, this component lets you change
* its appearance in several ways. It is possible to modify the colors of the
* graph by calling the setters {@link #setAxisColor(Color)},
* {@link #setMajorGridColor(Color)} and {@link #setMinorGridColor(Color)}.
*
* You can also enable or disable given parts of the resulting graph by
* calling the following setters:
*
*
* - {@link #setAxisPainted(boolean)}: Defines whether the main axis (see
* {@link #getOrigin()}) is painted.
* - {@link #setBackgroundPainted(boolean)}: Defines whether the background
* is painted (see {@link #setBackground(Color)}.)
* - {@link #setGridPainted(boolean)}: Defines whether the grid is
* painted.
* - {@link #setTextPainted(boolean)}: Defines whether the axis labels are
* painted.
*
*
* Usage example
*
* The following code snippet creates a new graph centered on
* (0, 0), bound to the view [-1.0 1.0 -1.0 1.0], with
* a major grid line every 0.5 units and a minor grid line count of 5:
*
*
* Point2D origin = new Point2D.Double(0.0d, 0.0d);
* Rectangle2D view = new Rectangle2D.Double(-1.0d, 1.0d, 2.0d, 2.0d);
* JXGraph graph = new JXGraph(origin, view, 0.5d, 5, 0.5d, 5);
*
*
* Plots
*
* Definition
*
* A plot is defined by a mathematical transformation that, given a value on
* the graph's X axis, returns a value on the Y axis. The component draws the
* result by plotting a spot of color at the coordinates defined by
* (X, f(X)) where f() is the aforementionned
* mathematical transformation. Given the following transformation:
*
*
* f(X) = X * 2.0
*
*
* For X=1.0, the component will show a spot of color at the
* coordinates (1.0, 2.0).
*
* Creating a new plot
*
* Every plot drawn by the component must be a subclass of
* {@link JXGraph.Plot}. This abstract public class defines a single method to
* be implemented by its children:
*
*
* public double compute(double value)
*
*
* The previous example can be defined by a concrete
* JXGraph.Plot as follow:
*
*
* class TwiceTheValuePlot extends JXGraph.Plot {
* public double compute(double value) {
* return value * 2.0d;
* }
* }
*
*
* Most of the time though, a plot requires supplementary parameters. For
* instance, let's define the X axis of your graph as the mass of an object. To
* compute the weight of the object given its mass, you need to use the
* acceleration of gravity (w=m*g where g is the
* acceleration.) To let the user modify this last parameter, to compute his
* weight at the surface of the moon for instance, you need to add a parameter
* to your plot.
*
* While JXGraph.Plot does not give you an API for such a
* purpose, it does define an event dispatching API (see
* {@link JXGraph#firePropertyChange(String, double, double)}.) Whenever a
* plot is added to the graph, the component registers itself as a property
* listener of the plot. If you take care of firing events whenever the user
* changes a parameter of your plot, the graph will automatically update its
* display. While not mandatory, it is highly recommended to leverage this
* API.
*
* Adding and removing plots to and from the graph
*
* To add a plot to the graph, simply call the method
* {@link #addPlots(Color, JXGraph.Plot...)}. You can use it to add one or more
* plots at the same time and associate them with a color. This color is used
* when drawing the plots:
*
*
* JXGraph.Plot plot = new TwiceTheValuePlot();
* graph.addPlots(Color.BLUE, plot);
*
*
* These two lines will display our previously defined plot in blue on
* screen. Removing one or several plots is as simple as calling the method
* {@link #removePlots(JXGraph.Plot...)}. You can also remove all plots at once
* with {@link #removeAllPlots()}.
*
* Painting more information
*
* How to draw on the graph
*
* If you need to add more information on the graph you need to extend
* it and override the method {@link #paintExtra(Graphics2D)}. This
* method has a default empty implementation and is called after everything
* has been drawn. Its sole parameter is a reference to the component's drawing
* surface, as configured by {@link #setupGraphics(Graphics2D)}. By default, the
* setup method activates antialising but it can be overriden to change the
* drawing surface. (Translation, rotation, new rendering hints, etc.)
*
* Getting the right coordinates
*
* To properly draw on the graph you will need to perform a translation
* between the graph's coordinates and the screen's coordinates. The component
* defines 4 methods to assist you in this task:
*
*
* - {@link #xPixelToPosition(double)}: Converts a pixel coordinate on the
* X axis into a world coordinate.
* - {@link #xPositionToPixel(double)}: Converts a world coordinate on the
* X axis into a pixel coordinate.
* - {@link #yPixelToPosition(double)}: Converts a pixel coordinate on the
* Y axis into a world coordinate.
* - {@link #yPositionToPixel(double)}: Converts a world coordinate on the
* Y axis into a pixel coordinate.
*
*
* If you have defined a graph view centered on the origin
* (0, 0), the origin of the graph will be at the exact center of
* the screen. That means the world coordinates (0, 0) are
* equivalent to the pixel coordinates (width / 2, height / 2).
* Thus, calling xPositionToPixel(0.0d) would give you the same
* value as the expression getWidth() / 2.0d.
*
* Converting from world coordinates to pixel coordinates is mostly used to
* draw the result of a mathematical transformation. Converting from pixel
* coordinates to world coordinates is mostly used to get the position in the
* world of a mouse event.
*
* @see JXGraph.Plot
* @author Romain Guy
*/
@JavaBean
public class JXGraph extends JXPanel {
// stroke widths used to draw the main axis and the grid
// the main axis is slightly thicker
private static final float STROKE_AXIS = 1.2f;
private static final float STROKE_GRID = 1.0f;
// defines by how much the view is shrinked or expanded everytime the
// user zooms in or out
private static final float ZOOM_MULTIPLIER = 1.1f;
//listens to changes to plots and repaints the graph
private PropertyChangeListener plotChangeListener;
// default color of the graph (does not include plots colors)
private Color majorGridColor = Color.GRAY.brighter();
private Color minorGridColor = new Color(220, 220, 220);
private Color axisColor = Color.BLACK;
// the list of plots currently known and displayed by the graph
private List plots;
// view boundaries as defined by the user
private double minX;
private double maxX;
private double minY;
private double maxY;
// the default view is set when the view is manually changed by the client
// it is used to reset the view in resetView()
private Rectangle2D defaultView;
// coordinates of the major axis
private double originX;
private double originY;
// definition of the grid
// various default values are used when the view is reset
private double majorX;
private double defaultMajorX;
private int minorCountX;
private double majorY;
private double defaultMajorY;
private int minorCountY;
// enables painting layers
private boolean textPainted = true;
private boolean gridPainted = true;
private boolean axisPainted = true;
private boolean backPainted = true;
// used by the PanHandler to move the view
private Point dragStart;
// mainFormatter is used for numbers > 0.01 and < 100
// secondFormatter uses scientific notation
private NumberFormat mainFormatter;
private NumberFormat secondFormatter;
// input handlers
private boolean inputEnabled = true;
private ZoomHandler zoomHandler;
private PanMotionHandler panMotionHandler;
private PanHandler panHandler;
private ResetHandler resetHandler;
/**
* Creates a new graph display. The following properties are
* automatically set:
*
* - view: -1.0 to +1.0 on both axis
* - origin: At
(0, 0)
* - grid: Spacing of 0.2 between major lines; minor lines
* count is 4
*
*/
public JXGraph() {
this(0.0, 0.0, -1.0, 1.0, -1.0, 1.0, 0.2, 4, 0.2, 4);
}
/**
* Creates a new graph display with the specified view. The following
* properties are automatically set:
*
* - origin: Center of the specified view
* Creates a new graph display with the specified view and grid lines. * The origin is set at the center of the view.
* * @param view the rectangle defining the view boundaries * @param majorX the spacing between two major grid lines on the X axis * @param minorCountX the number of minor grid lines between two major * grid lines on the X axis * @param majorY the spacing between two major grid lines on the Y axis * @param minorCountY the number of minor grid lines between two major * grid lines on the Y axis * @throws IllegalArgumentException if minX >= maxX or minY >= maxY or * minorCountX < 0 or minorCountY < 0 or * majorX <= 0.0 or majorY <= 0.0 */ public JXGraph(Rectangle2D view, double majorX, int minorCountX, double majorY, int minorCountY) { this(new Point2D.Double(view.getCenterX(), view.getCenterY()), view, majorX, minorCountX, majorY, minorCountY); } /** *Creates a new graph display with the specified view and origin. * The following properties are automatically set:
*-
*
- grid: Spacing of 0.2 between major lines; minor lines * count is 4 *
Creates a new graph display with the specified view, origin and grid * lines.
* * @param origin the coordinates of the main axis origin * @param view the rectangle defining the view boundaries * @param majorX the spacing between two major grid lines on the X axis * @param minorCountX the number of minor grid lines between two major * grid lines on the X axis * @param majorY the spacing between two major grid lines on the Y axis * @param minorCountY the number of minor grid lines between two major * grid lines on the Y axis * @throws IllegalArgumentException if minX >= maxX or minY >= maxY or * minorCountX < 0 or minorCountY < 0 or * majorX <= 0.0 or majorY <= 0.0 */ public JXGraph(Point2D origin, Rectangle2D view, double majorX, int minorCountX, double majorY, int minorCountY) { this(origin.getX(), origin.getY(), view.getMinX(), view.getMaxX(), view.getMinY(), view.getMaxY(), majorX, minorCountX, majorY, minorCountY); } /** *Creates a new graph display with the specified view, origin and grid * lines.
* * @param originX the coordinate of the major X axis * @param originY the coordinate of the major Y axis * @param minX the minimum coordinate on the X axis for the view * @param maxX the maximum coordinate on the X axis for the view * @param minY the minimum coordinate on the Y axis for the view * @param maxY the maximum coordinate on the Y axis for the view * @param majorX the spacing between two major grid lines on the X axis * @param minorCountX the number of minor grid lines between two major * grid lines on the X axis * @param majorY the spacing between two major grid lines on the Y axis * @param minorCountY the number of minor grid lines between two major * grid lines on the Y axis * @throws IllegalArgumentException if minX >= maxX or minY >= maxY or * minorCountX < 0 or minorCountY < 0 or * majorX <= 0.0 or majorY <= 0.0 */ public JXGraph(double originX, double originY, double minX, double maxX, double minY, double maxY, double majorX, int minorCountX, double majorY, int minorCountY) { if (minX >= maxX) { throw new IllegalArgumentException("minX must be < to maxX"); } if (minY >= maxY) { throw new IllegalArgumentException("minY must be < to maxY"); } if (minorCountX < 0) { throw new IllegalArgumentException("minorCountX must be >= 0"); } if (minorCountY < 0) { throw new IllegalArgumentException("minorCountY must be >= 0"); } if (majorX <= 0.0) { throw new IllegalArgumentException("majorX must be > 0.0"); } if (majorY <= 0.0) { throw new IllegalArgumentException("majorY must be > 0.0"); } this.originX = originX; this.originY = originY; this.minX = minX; this.maxX = maxX; this.minY = minY; this.maxY = maxY; this.defaultView = new Rectangle2D.Double(minX, minY, maxX - minX, maxY - minY); this.setMajorX(this.defaultMajorX = majorX); this.setMinorCountX(minorCountX); this.setMajorY(this.defaultMajorY = majorY); this.setMinorCountY(minorCountY); this.plots = new LinkedListEnables or disables user input on the component. When user input is * enabled, panning, zooming and view resetting. Disabling input will * prevent the user from modifying the currently displayed view.
*
Calling {@link #setEnabled(boolean)} disables the component in the * Swing hierarchy and invokes this method.
* * @param enabled true if user input must be enabled, false otherwise * @see #setEnabled(boolean) * @see #isInputEnabled() */ public void setInputEnabled(boolean enabled) { if (inputEnabled != enabled) { boolean old = isInputEnabled(); this.inputEnabled = enabled; if (enabled) { addMouseListener(resetHandler); addMouseListener(panHandler); addMouseMotionListener(panMotionHandler); addMouseWheelListener(zoomHandler); } else { removeMouseListener(resetHandler); removeMouseListener(panHandler); removeMouseMotionListener(panMotionHandler); removeMouseWheelListener(zoomHandler); } firePropertyChange("inputEnabled", old, isInputEnabled()); } } /** *Defines whether or not user input is accepted and managed by this * component. The component is always created with user input enabled.
* * @return true if user input is enabled, false otherwise * @see #setInputEnabled(boolean) */ public boolean isInputEnabled() { return inputEnabled; } /** *Defines whether or not axis labels are painted by this component. * The component is always created with text painting enabled.
* * @return true if axis labels are painted, false otherwise * @see #setTextPainted(boolean) * @see #getForeground() */ public boolean isTextPainted() { return textPainted; } /** *Enables or disables the painting of axis labels depending on the * value of the parameter. Text painting is enabled by default.
* * @param textPainted if true, axis labels are painted * @see #isTextPainted() * @see #setForeground(Color) */ public void setTextPainted(boolean textPainted) { boolean old = isTextPainted(); this.textPainted = textPainted; firePropertyChange("textPainted", old, this.textPainted); } /** *Defines whether or not grids lines are painted by this component. * The component is always created with grid lines painting enabled.
* * @return true if grid lines are painted, false otherwise * @see #setGridPainted(boolean) * @see #getMajorGridColor() * @see #getMinorGridColor() */ public boolean isGridPainted() { return gridPainted; } /** *Enables or disables the painting of grid lines depending on the * value of the parameter. Grid painting is enabled by default.
* * @param gridPainted if true, axis labels are painted * @see #isGridPainted() * @see #setMajorGridColor(Color) * @see #setMinorGridColor(Color) */ public void setGridPainted(boolean gridPainted) { boolean old = isGridPainted(); this.gridPainted = gridPainted; firePropertyChange("gridPainted", old, isGridPainted()); } /** *Defines whether or not the graph main axis is painted by this * component. The component is always created with main axis painting * enabled.
* * @return true if main axis is painted, false otherwise * @see #setTextPainted(boolean) * @see #getAxisColor() */ public boolean isAxisPainted() { return axisPainted; } /** *Enables or disables the painting of main axis depending on the * value of the parameter. Axis painting is enabled by default.
* * @param axisPainted if true, axis labels are painted * @see #isAxisPainted() * @see #setAxisColor(Color) */ public void setAxisPainted(boolean axisPainted) { boolean old = isAxisPainted(); this.axisPainted = axisPainted; firePropertyChange("axisPainted", old, isAxisPainted()); } /** *Defines whether or not the background painted by this component. * The component is always created with background painting enabled. * When background painting is disabled, background painting is deferred * to the parent class.
* * @return true if background is painted, false otherwise * @see #setBackgroundPainted(boolean) * @see #getBackground() */ public boolean isBackgroundPainted() { return backPainted; } /** *Enables or disables the painting of background depending on the * value of the parameter. Background painting is enabled by default.
* * @param backPainted if true, axis labels are painted * @see #isBackgroundPainted() * @see #setBackground(Color) */ public void setBackgroundPainted(boolean backPainted) { boolean old = isBackgroundPainted(); this.backPainted = backPainted; firePropertyChange("backgroundPainted", old, isBackgroundPainted()); } /** *Gets the major grid lines color of this component.
* * @return this component's major grid lines color * @see #setMajorGridColor(Color) * @see #setGridPainted(boolean) */ public Color getMajorGridColor() { return majorGridColor; } /** *Sets the color of major grid lines on this component. The color * can be translucent.
* * @param majorGridColor the color to become this component's major grid * lines color * @throws IllegalArgumentException if the specified color is null * @see #getMajorGridColor() * @see #isGridPainted() */ public void setMajorGridColor(Color majorGridColor) { if (majorGridColor == null) { throw new IllegalArgumentException("Color cannot be null."); } Color old = getMajorGridColor(); this.majorGridColor = majorGridColor; firePropertyChange("majorGridColor", old, getMajorGridColor()); } /** *Gets the minor grid lines color of this component.
* * @return this component's minor grid lines color * @see #setMinorGridColor(Color) * @see #setGridPainted(boolean) */ public Color getMinorGridColor() { return minorGridColor; } /** *Sets the color of minor grid lines on this component. The color * can be translucent.
* * @param minorGridColor the color to become this component's minor grid * lines color * @throws IllegalArgumentException if the specified color is null * @see #getMinorGridColor() * @see #isGridPainted() */ public void setMinorGridColor(Color minorGridColor) { if (minorGridColor == null) { throw new IllegalArgumentException("Color cannot be null."); } Color old = getMinorGridColor(); this.minorGridColor = minorGridColor; firePropertyChange("minorGridColor", old, getMinorGridColor()); } /** *Gets the main axis color of this component.
* * @return this component's main axis color * @see #setAxisColor(Color) * @see #setGridPainted(boolean) */ public Color getAxisColor() { return axisColor; } /** *Sets the color of main axis on this component. The color * can be translucent.
* * @param axisColor the color to become this component's main axis color * @throws IllegalArgumentException if the specified color is null * @see #getAxisColor() * @see #isAxisPainted() */ public void setAxisColor(Color axisColor) { if (axisColor == null) { throw new IllegalArgumentException("Color cannot be null."); } Color old = getAxisColor(); this.axisColor = axisColor; firePropertyChange("axisColor", old, getAxisColor()); } /** *Gets the distance, in graph units, between two major grid lines on * the X axis.
* * @return the spacing between two major grid lines on the X axis * @see #setMajorX(double) * @see #getMajorY() * @see #setMajorY(double) * @see #getMinorCountX() * @see #setMinorCountX(int) */ public double getMajorX() { return majorX; } /** *Sets the distance, in graph units, between two major grid lines on * the X axis.
* * @param majorX the requested spacing between two major grid lines on the * X axis * @throws IllegalArgumentException if majorX is <= 0.0d * @see #getMajorX() * @see #getMajorY() * @see #setMajorY(double) * @see #getMinorCountX() * @see #setMinorCountX(int) */ public void setMajorX(double majorX) { if (majorX <= 0.0) { throw new IllegalArgumentException("majorX must be > 0.0"); } double old = getMajorX(); this.majorX = majorX; this.defaultMajorX = majorX; repaint(); firePropertyChange("majorX", old, getMajorX()); } /** *Gets the number of minor grid lines between two major grid lines * on the X axis.
* * @return the number of minor grid lines between two major grid lines * @see #setMinorCountX(int) * @see #getMinorCountY() * @see #setMinorCountY(int) * @see #getMajorX() * @see #setMajorX(double) */ public int getMinorCountX() { return minorCountX; } /** *Sets the number of minor grid lines between two major grid lines on * the X axis.
* * @param minorCountX the number of minor grid lines between two major grid * lines on the X axis * @throws IllegalArgumentException if minorCountX is < 0 * @see #getMinorCountX() * @see #getMinorCountY() * @see #setMinorCountY(int) * @see #getMajorX() * @see #setMajorX(double) */ public void setMinorCountX(int minorCountX) { if (minorCountX < 0) { throw new IllegalArgumentException("minorCountX must be >= 0"); } int old = getMinorCountX(); this.minorCountX = minorCountX; repaint(); firePropertyChange("minorCountX", old, getMinorCountX()); } /** *Gets the distance, in graph units, between two major grid lines on * the Y axis.
* * @return the spacing between two major grid lines on the Y axis * @see #setMajorY(double) * @see #getMajorX() * @see #setMajorX(double) * @see #getMinorCountY() * @see #setMinorCountY(int) */ public double getMajorY() { return majorY; } /** *Sets the distance, in graph units, between two major grid lines on * the Y axis.
* * @param majorY the requested spacing between two major grid lines on the * Y axis * @throws IllegalArgumentException if majorY is <= 0.0d * @see #getMajorY() * @see #getMajorX() * @see #setMajorX(double) * @see #getMinorCountY() * @see #setMinorCountY(int) */ public void setMajorY(double majorY) { if (majorY <= 0.0) { throw new IllegalArgumentException("majorY must be > 0.0"); } double old = getMajorY(); this.majorY = majorY; this.defaultMajorY = majorY; repaint(); firePropertyChange("majorY", old, getMajorY()); } /** *Gets the number of minor grid lines between two major grid lines * on the Y axis.
* * @return the number of minor grid lines between two major grid lines * @see #setMinorCountY(int) * @see #getMinorCountX() * @see #setMinorCountX(int) * @see #getMajorY() * @see #setMajorY(double) */ public int getMinorCountY() { return minorCountY; } /** *Sets the number of minor grid lines between two major grid lines on * the Y axis.
* * @param minorCountY the number of minor grid lines between two major grid * lines on the Y axis * @throws IllegalArgumentException if minorCountY is < 0 * @see #getMinorCountY() * @see #getMinorCountX() * @see #setMinorCountX(int) * @see #getMajorY() * @see #setMajorY(double) */ public void setMinorCountY(int minorCountY) { if (minorCountY < 0) { throw new IllegalArgumentException("minorCountY must be >= 0"); } int old = getMinorCountY(); this.minorCountY = minorCountY; repaint(); firePropertyChange("minorCountY", old, getMinorCountY()); } /** *Sets the view and the origin of the graph at the same time. The view * minimum boundaries are defined by the location of the rectangle passed * as parameter. The width and height of the rectangle define the distance * between the minimum and maximum boundaries:
* *-
*
- minX: bounds.getX() *
- minY: bounds.getY() *
- maxY: bounds.getMaxX() (minX + bounds.getWidth()) *
- maxX: bounds.getMaxY() (minY + bounds.getHeight()) *
The origin is located at the center of the view. Its coordinates are * defined by calling bounds.getCenterX() and bounds.getCenterY().
* * @param bounds the rectangle defining the graph's view and its origin * @see #getView() * @see #setView(Rectangle2D) * @see #getOrigin() * @see #setOrigin(Point2D) */ public void setViewAndOrigin(Rectangle2D bounds) { setView(bounds); setOrigin(new Point2D.Double(bounds.getCenterX(), bounds.getCenterY())); } /** *Sets the view of the graph. The view minimum boundaries are defined by * the location of the rectangle passed as parameter. The width and height * of the rectangle define the distance between the minimum and maximum * boundaries:
* *-
*
- minX: bounds.getX() *
- minY: bounds.getY() *
- maxY: bounds.getMaxX() (minX + bounds.getWidth()) *
- maxX: bounds.getMaxY() (minY + bounds.getHeight()) *
If the specified view is null, nothing happens.
* *Calling this method leaves the origin intact.
* * @param bounds the rectangle defining the graph's view and its origin * @see #getView() * @see #setViewAndOrigin(Rectangle2D) */ public void setView(Rectangle2D bounds) { if (bounds == null) { return; } Rectangle2D old = getView(); defaultView = new Rectangle2D.Double(bounds.getX(), bounds.getY(), bounds.getWidth(), bounds.getHeight()); minX = defaultView.getMinX(); maxX = defaultView.getMaxX(); minY = defaultView.getMinY(); maxY = defaultView.getMaxY(); majorX = defaultMajorX; majorY = defaultMajorY; firePropertyChange("view", old, getView()); repaint(); } /** *Gets the view of the graph. The returned rectangle defines the bounds * of the view as follows:
* *-
*
- minX: bounds.getX() *
- minY: bounds.getY() *
- maxY: bounds.getMaxX() (minX + bounds.getWidth()) *
- maxX: bounds.getMaxY() (minY + bounds.getHeight()) *
Resets the view to the default view if it has been changed by the user * by panning and zooming. The default view is defined by the view last * specified in a constructor call or a call to the methods * {@link #setView(Rectangle2D)} and * {@link #setViewAndOrigin(Rectangle2D)}.
* * @see #setView(Rectangle2D) * @see #setViewAndOrigin(Rectangle2D) */ public void resetView() { setView(defaultView); } /** *Sets the origin of the graph. The coordinates of the origin are * defined by the coordinates of the point passed as parameter.
* *If the specified view is null, nothing happens.
* *Calling this method leaves the view intact.
* * @param origin the coordinates of the new origin * @see #getOrigin() * @see #setViewAndOrigin(Rectangle2D) */ public void setOrigin(Point2D origin) { if (origin == null) { return; } Point2D old = getOrigin(); originX = origin.getX(); originY = origin.getY(); firePropertyChange("origin", old, getOrigin()); repaint(); } /** *Gets the origin coordinates of the graph. The coordinates are
* represented as an instance of Point2D and stored in
* double format.
Adds one or more plots to the graph. These plots are associated to * a color used to draw them.
* *If plotList is null or empty, nothing happens.
* *This method is not thread safe and should be called only from the * EDT.
* * @param color the color to be usd to draw the plots * @param plotList the list of plots to add to the graph * @throws IllegalArgumentException if color is null * @see #removePlots(JXGraph.Plot...) * @see #removeAllPlots() */ public void addPlots(Color color, Plot... plotList) { if (color == null) { throw new IllegalArgumentException("Plots color cannot be null."); } if (plotList == null) { return; } for (Plot plot : plotList) { DrawablePlot drawablePlot = new DrawablePlot(plot, color); if (plot != null && !plots.contains(drawablePlot)) { plot.addPropertyChangeListener(plotChangeListener); plots.add(drawablePlot); } } repaint(); } /** *Removes the specified plots from the graph. Plots to be removed * are identified by identity. This means you cannot remove a plot by * passing a clone or another instance of the same subclass of * {@link JXGraph.Plot}.
* *If plotList is null or empty, nothing happens.
* *This method is not thread safe and should be called only from the * EDT.
* * @param plotList the list of plots to be removed from the graph * @see #removeAllPlots() * @see #addPlots(Color, JXGraph.Plot...) */ public void removePlots(Plot... plotList) { if (plotList == null) { return; } for (Plot plot : plotList) { if (plot != null) { DrawablePlot toRemove = null; for (DrawablePlot drawable: plots) { if (drawable.getEquation() == plot) { toRemove = drawable; break; } } if (toRemove != null) { plot.removePropertyChangeListener(plotChangeListener); plots.remove(toRemove); } } } repaint(); } /** *Removes all the plots currently associated with this graph.
* *This method is not thread safe and should be called only from the * EDT.
* * @see #removePlots(JXGraph.Plot...) * @see #addPlots(Color, JXGraph.Plot...) */ public void removeAllPlots() { plots.clear(); repaint(); } /** * {@inheritDoc} */ @Override public Dimension getPreferredSize() { return new Dimension(400, 400); } /** *Converts a position, in graph units, from the Y axis into a pixel
* coordinate. For instance, if you defined the origin so it appears at the
* exact center of the view, calling
* yPositionToPixel(getOriginY()) will return a value
* approximately equal to getHeight() / 2.0.
Converts a position, in graph units, from the X axis into a pixel
* coordinate. For instance, if you defined the origin so it appears at the
* exact center of the view, calling
* xPositionToPixel(getOriginX()) will return a value
* approximately equal to getWidth() / 2.0.
Converts a pixel coordinate from the X axis into a graph position, in
* graph units. For instance, if you defined the origin so it appears at the
* exact center of the view, calling
* xPixelToPosition(getWidth() / 2.0) will return a value
* approximately equal to getOriginX().
Converts a pixel coordinate from the Y axis into a graph position, in
* graph units. For instance, if you defined the origin so it appears at the
* exact center of the view, calling
* yPixelToPosition(getHeight() / 2.0) will return a value
* approximately equal to getOriginY().
This painting method is meant to be overridden by subclasses of
* JXGraph. This method is called after all the painting
* is done. By overriding this method, a subclass can display extra
* information on top of the graph.
The graphics surface passed as parameter is configured by * {@link #setupGraphics(Graphics2D)}.
* * @param g2 the graphics surface on which the graph is drawn * @see #setupGraphics(Graphics2D) * @see #xPixelToPosition(double) * @see #yPixelToPosition(double) * @see #xPositionToPixel(double) * @see #yPositionToPixel(double) */ protected void paintExtra(Graphics2D g2) { } // Draw all the registered plots with the appropriate color. private void drawPlots(Graphics2D g2) { for (DrawablePlot drawable: plots) { g2.setColor(drawable.getColor()); drawPlot(g2, drawable.getEquation()); } } // Draw a single plot as a GeneralPath made of straight lines. private void drawPlot(Graphics2D g2, Plot equation) { float x = 0.0f; float y = (float) yPositionToPixel(equation.compute(xPixelToPosition(0.0))); GeneralPath path = new GeneralPath(); path.moveTo(x, y); float width = getWidth(); for (x = 0.0f; x < width; x += 1.0f) { double position = xPixelToPosition(x); y = (float) yPositionToPixel(equation.compute(position)); path.lineTo(x, y); } g2.draw(path); } // Draws the grid. First draw the vertical lines, then the horizontal lines. private void drawGrid(Graphics2D g2) { Stroke stroke = g2.getStroke(); if (isGridPainted()) { drawVerticalGrid(g2); drawHorizontalGrid(g2); } g2.setStroke(stroke); } // Draw all labels. First draws labels on the horizontal axis, then labels // on the vertical axis. If the axis is set not to be painted, this // method draws the origin as a straight cross. private void drawLabels(Graphics2D g2) { if (isTextPainted()) { double axisH = yPositionToPixel(originY); double axisV = xPositionToPixel(originX); if (isAxisPainted()) { Stroke stroke = g2.getStroke(); g2.setStroke(new BasicStroke(STROKE_AXIS)); g2.setColor(getAxisColor()); g2.drawLine((int) axisV - 3, (int) axisH, (int) axisV + 3, (int) axisH); g2.drawLine((int) axisV, (int) axisH - 3, (int) axisV, (int) axisH + 3); g2.setStroke(stroke); } g2.setColor(getForeground()); FontMetrics metrics = g2.getFontMetrics(); g2.drawString(format(originX) + "; " + format(originY), (int) axisV + 5, (int) axisH + metrics.getHeight()); drawHorizontalAxisLabels(g2); drawVerticalAxisLabels(g2); } } // Draws labels on the vertical axis. First draws labels below the origin, // then draw labels on top of the origin. private void drawVerticalAxisLabels(Graphics2D g2) { double axisV = xPositionToPixel(originX); // double startY = Math.floor((minY - originY) / majorY) * majorY; double startY = Math.floor(minY / majorY) * majorY; for (double y = startY; y < maxY + majorY; y += majorY) { if (((y - majorY / 2.0) < originY) && ((y + majorY / 2.0) > originY)) { continue; } int position = (int) yPositionToPixel(y); g2.drawString(format(y), (int) axisV + 5, position); } } // Draws the horizontal lines of the grid. Draws both minor and major // grid lines. private void drawHorizontalGrid(Graphics2D g2) { double minorSpacing = majorY / getMinorCountY(); double axisV = xPositionToPixel(originX); Stroke gridStroke = new BasicStroke(STROKE_GRID); Stroke axisStroke = new BasicStroke(STROKE_AXIS); Rectangle clip = g2.getClipBounds(); int position; if (!isAxisPainted()) { position = (int) xPositionToPixel(originX); if (position >= clip.x && position <= clip.x + clip.width) { g2.setColor(getMajorGridColor()); g2.drawLine(position, clip.y, position, clip.y + clip.height); } } // double startY = Math.floor((minY - originY) / majorY) * majorY; double startY = Math.floor(minY / majorY) * majorY; for (double y = startY; y < maxY + majorY; y += majorY) { g2.setStroke(gridStroke); g2.setColor(getMinorGridColor()); for (int i = 0; i < getMinorCountY(); i++) { position = (int) yPositionToPixel(y - i * minorSpacing); if (position >= clip.y && position <= clip.y + clip.height) { g2.drawLine(clip.x, position, clip.x + clip.width, position); } } position = (int) yPositionToPixel(y); if (position >= clip.y && position <= clip.y + clip.height) { g2.setColor(getMajorGridColor()); g2.drawLine(clip.x, position, clip.x + clip.width, position); if (isAxisPainted()) { g2.setStroke(axisStroke); g2.setColor(getAxisColor()); g2.drawLine((int) axisV - 3, position, (int) axisV + 3, position); } } } } // Draws labels on the horizontal axis. First draws labels on the right of // the origin, then on the left. private void drawHorizontalAxisLabels(Graphics2D g2) { double axisH = yPositionToPixel(originY); FontMetrics metrics = g2.getFontMetrics(); // double startX = Math.floor((minX - originX) / majorX) * majorX; double startX = Math.floor(minX / majorX) * majorX; for (double x = startX; x < maxX + majorX; x += majorX) { if (((x - majorX / 2.0) < originX) && ((x + majorX / 2.0) > originX)) { continue; } int position = (int) xPositionToPixel(x); g2.drawString(format(x), position, (int) axisH + metrics.getHeight()); } } // Draws the vertical lines of the grid. Draws both minor and major // grid lines. private void drawVerticalGrid(Graphics2D g2) { double minorSpacing = majorX / getMinorCountX(); double axisH = yPositionToPixel(originY); Stroke gridStroke = new BasicStroke(STROKE_GRID); Stroke axisStroke = new BasicStroke(STROKE_AXIS); Rectangle clip = g2.getClipBounds(); int position; if (!isAxisPainted()) { position = (int) yPositionToPixel(originY); if (position >= clip.y && position <= clip.y + clip.height) { g2.setColor(getMajorGridColor()); g2.drawLine(clip.x, position, clip.x + clip.width, position); } } // double startX = Math.floor((minX - originX) / majorX) * majorX; double startX = Math.floor(minX / majorX) * majorX; for (double x = startX; x < maxX + majorX; x += majorX) { g2.setStroke(gridStroke); g2.setColor(getMinorGridColor()); for (int i = 0; i < getMinorCountX(); i++) { position = (int) xPositionToPixel(x - i * minorSpacing); if (position >= clip.x && position <= clip.x + clip.width) { g2.drawLine(position, clip.y, position, clip.y + clip.height); } } position = (int) xPositionToPixel(x); if (position >= clip.x && position <= clip.x + clip.width) { g2.setColor(getMajorGridColor()); g2.drawLine(position, clip.y, position, clip.y + clip.height); if (isAxisPainted()) { g2.setStroke(axisStroke); g2.setColor(getAxisColor()); g2.drawLine(position, (int) axisH - 3, position, (int) axisH + 3); } } } } // Drase the main axis. private void drawAxis(Graphics2D g2) { if (!isAxisPainted()) { return; } double axisH = yPositionToPixel(originY); double axisV = xPositionToPixel(originX); Rectangle clip = g2.getClipBounds(); g2.setColor(getAxisColor()); Stroke stroke = g2.getStroke(); g2.setStroke(new BasicStroke(STROKE_AXIS)); if (axisH >= clip.y && axisH <= clip.y + clip.height) { g2.drawLine(clip.x, (int) axisH, clip.x + clip.width, (int) axisH); } if (axisV >= clip.x && axisV <= clip.x + clip.width) { g2.drawLine((int) axisV, clip.y, (int) axisV, clip.y + clip.height); } g2.setStroke(stroke); } /** *This method is called by the component prior to any drawing operation * to configure the drawing surface. The default implementation enables * antialiasing on the graphics.
*This method can be overriden by subclasses to modify the drawing * surface before any painting happens.
* * @param g2 the graphics surface to set up * @see #paintExtra(Graphics2D) * @see #paintBackground(Graphics2D) */ protected void setupGraphics(Graphics2D g2) { g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); } /** *This method is called by the component whenever it needs to paint * its background. The default implementation fills the background with * a solid color as defined by {@link #getBackground()}. Background painting * does not happen when {@link #isBackgroundPainted()} returns false.
*It is recommended to subclasses to honor the contract defined by * {@link #isBackgroundPainted()} and {@link #setBackgroundPainted(boolean)}. * * @param g2 the graphics surface on which the background must be drawn * @see #setupGraphics(Graphics2D) * @see #paintExtra(Graphics2D) * @see #isBackgroundPainted() * @see #setBackgroundPainted(boolean) */ protected void paintBackground(Graphics2D g2) { if (isBackgroundPainted()) { Painter p = getBackgroundPainter(); if (p != null) { p.paint(g2, this, getWidth(), getHeight()); } else { g2.setColor(getBackground()); g2.fill(g2.getClipBounds()); } } } // Format a number with the appropriate number formatter. Numbers >= 0.01 // and < 100 are formatted with a regular, 2-digits, numbers formatter. // Other numbers use a scientific notation given by a DecimalFormat instance private String format(double number) { boolean farAway = (number != 0.0d && Math.abs(number) < 0.01d) || Math.abs(number) > 99.0d; return (farAway ? secondFormatter : mainFormatter).format(number); } /** *
A plot represents a mathematical transformation used by * {@link JXGraph}. When a plot belongs to a graph, the graph component * asks for the transformation of a value along the X axis. The resulting * value defines the Y coordinates at which the graph must draw a spot of * color.
* *Here is a sample implementation of this class that draws a straight line * once added to a graph (it follows the well-known equation y=a.x+b):
* *
* class LinePlot extends JXGraph.Plot {
* public double compute(double value) {
* return 2.0 * value + 1.0;
* }
* }
*
*
* When a plot is added to an instance of
* JXGraph, the JXGraph automatically becomes
* a new property change listener of the plot. If property change events are
* fired, the graph will be updated accordingly.
More information about plots usage can be found in {@link JXGraph} in * the section entitled Plots.
* * @see JXGraph * @see JXGraph#addPlots(Color, JXGraph.Plot...) */ public abstract static class Plot extends AbstractBean { /** *Creates a new, parameter-less plot.
*/ protected Plot() { } /** *This method must return the result of a mathematical * transformation of its sole parameter.
* * @param value a value along the X axis of the graph currently * drawing this plot * @return the result of the mathematical transformation of value */ public abstract double compute(double value); } // Encapsulates a plot and its color. Avoids the use of a full-blown Map. private static class DrawablePlot { private final Plot equation; private final Color color; private DrawablePlot(Plot equation, Color color) { this.equation = equation; this.color = color; } private Plot getEquation() { return equation; } private Color getColor() { return color; } @Override public boolean equals(Object o) { if (this == o) { return true; } if (o == null || getClass() != o.getClass()) { return false; } final DrawablePlot that = (DrawablePlot) o; if (!color.equals(that.color)) { return false; } return equation.equals(that.equation); } @Override public int hashCode() { int result; result = equation.hashCode(); result = 29 * result + color.hashCode(); return result; } } // Shrinks or expand the view depending on the mouse wheel direction. // When the wheel moves down, the view is expanded. Otherwise it is shrunk. private class ZoomHandler implements MouseWheelListener { @Override public void mouseWheelMoved(MouseWheelEvent e) { double distanceX = maxX - minX; double distanceY = maxY - minY; double cursorX = minX + distanceX / 2.0; double cursorY = minY + distanceY / 2.0; int rotation = e.getWheelRotation(); if (rotation < 0) { distanceX /= ZOOM_MULTIPLIER; distanceY /= ZOOM_MULTIPLIER; majorX /= ZOOM_MULTIPLIER; majorY /= ZOOM_MULTIPLIER; } else { distanceX *= ZOOM_MULTIPLIER; distanceY *= ZOOM_MULTIPLIER; majorX *= ZOOM_MULTIPLIER; majorY *= ZOOM_MULTIPLIER; } minX = cursorX - distanceX / 2.0; maxX = cursorX + distanceX / 2.0; minY = cursorY - distanceY / 2.0; maxY = cursorY + distanceY / 2.0; repaint(); } } // Listens for a click on the middle button of the mouse and resets the view private class ResetHandler extends MouseAdapter { @Override public void mousePressed(MouseEvent e) { if (e.getButton() != MouseEvent.BUTTON2) { return; } resetView(); } } // Starts and ends drag gestures with mouse left button. private class PanHandler extends MouseAdapter { @Override public void mousePressed(MouseEvent e) { if (e.getButton() != MouseEvent.BUTTON1) { return; } dragStart = e.getPoint(); setCursor(Cursor.getPredefinedCursor(Cursor.MOVE_CURSOR)); } @Override public void mouseReleased(MouseEvent e) { if (e.getButton() != MouseEvent.BUTTON1) { return; } setCursor(Cursor.getDefaultCursor()); } } // Handles drag gesture with the left mouse button and relocates the view // accordingly. private class PanMotionHandler extends MouseMotionAdapter { @Override public void mouseDragged(MouseEvent e) { Point dragEnd = e.getPoint(); double distance = xPixelToPosition(dragEnd.getX()) - xPixelToPosition(dragStart.getX()); minX = minX - distance; maxX = maxX - distance; distance = yPixelToPosition(dragEnd.getY()) - yPixelToPosition(dragStart.getY()); minY = minY - distance; maxY = maxY - distance; repaint(); dragStart = dragEnd; } } }