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/*******************************************************************************
* Copyright (c) 2000, 2010, 2012 IBM Corporation, Gerhardt Informatics Kft. and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
* Gerhardt Informatics Kft. - GEFGWT port
*******************************************************************************/
package org.eclipse.draw2d;
import java.util.ArrayList;
import org.eclipse.draw2d.geometry.Dimension;
import org.eclipse.draw2d.geometry.Rectangle;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.FontMetrics;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.widgets.Shell;
/**
* Provides miscellaneous Figure operations.
*/
public class FigureUtilities {
private static final float RGB_VALUE_MULTIPLIER = 0.6f;
private static GC gc;
private static Font appliedFont;
private static FontMetrics metrics;
private static Color ghostFillColor = new Color(null, 31, 31, 31);
/**
* Returns a new Color the same as the passed color in a darker hue.
*
* @param color
* the color to darken
* @return the darkened color
* @since 2.0
*/
public static Color darker(Color color) {
return new Color(null, (int) (color.getRed() * RGB_VALUE_MULTIPLIER),
(int) (color.getGreen() * RGB_VALUE_MULTIPLIER),
(int) (color.getBlue() * RGB_VALUE_MULTIPLIER));
}
/**
* Returns the FontMetrics associated with the passed Font.
*
* @param f
* the font
* @return the FontMetrics for the given font
* @see GC#getFontMetrics()
* @since 2.0
*/
public static FontMetrics getFontMetrics(Font f) {
setFont(f);
if (metrics == null)
metrics = getGC().getFontMetrics();
return metrics;
}
/**
* Returns the GC used for various utilities. Advanced graphics must not be
* switched on by clients using this GC.
*
* @deprecated do not mess with this GC
* @return the GC
*/
protected static GC getGC() {
if (gc == null) {
gc = new GC(new Shell());
appliedFont = gc.getFont();
}
return gc;
}
/**
* Returns the dimensions of the String s using the font f.
* Tab expansion and carriage return processing are performed.
*
* @param s
* the string
* @param f
* the font
* @return the text's dimensions
* @see GC#textExtent(String)
*/
protected static org.eclipse.swt.graphics.Point getTextDimension(String s,
Font f) {
setFont(f);
return getGC().textExtent(s);
}
/**
* Returns the highest ancestor for the given figure
*
* @since 3.0
* @param figure
* a figure
* @return the root ancestor
*/
public static IFigure getRoot(IFigure figure) {
while (figure.getParent() != null)
figure = figure.getParent();
return figure;
}
/**
* Returns the dimensions of the String s using the font f. No
* tab expansion or carriage return processing will be performed.
*
* @param s
* the string
* @param f
* the font
* @return the string's dimensions
* @see GC#stringExtent(java.lang.String)
*/
protected static org.eclipse.swt.graphics.Point getStringDimension(
String s, Font f) {
setFont(f);
return getGC().stringExtent(s);
}
/**
* Returns the Dimensions of the given text, converting newlines and tabs
* appropriately.
*
* @param text
* the text
* @param f
* the font
* @return the dimensions of the given text
* @since 2.0
*/
public static Dimension getTextExtents(String text, Font f) {
return new Dimension(getTextDimension(text, f));
}
/**
* Returns the Dimensions of s in Font f.
*
* @param s
* the string
* @param f
* the font
* @return the dimensions of the given string
* @since 2.0
*/
public static Dimension getStringExtents(String s, Font f) {
return new Dimension(getStringDimension(s, f));
}
/**
* Returns the Dimensions of the given text, converting newlines and tabs
* appropriately.
*
* @param s
* the string
* @param f
* the font
* @param result
* the Dimension that will contain the result of this calculation
* @since 2.0
*/
public static void getTextExtents(String s, Font f, Dimension result) {
org.eclipse.swt.graphics.Point pt = getTextDimension(s, f);
result.width = pt.x;
result.height = pt.y;
}
/**
* Returns the width of s in Font f.
*
* @param s
* the string
* @param f
* the font
* @return the width
* @since 2.0
*/
public static int getTextWidth(String s, Font f) {
return getTextDimension(s, f).x;
}
/**
* Returns a Color the same as the passed color in a lighter hue.
*
* @param rgb
* the color
* @return the lighter color
* @since 2.0
*/
public static Color lighter(Color rgb) {
int r = rgb.getRed(), g = rgb.getGreen(), b = rgb.getBlue();
return new Color(null, Math.max(2,
Math.min((int) (r / RGB_VALUE_MULTIPLIER), 255)), Math.max(2,
Math.min((int) (g / RGB_VALUE_MULTIPLIER), 255)), Math.max(2,
Math.min((int) (b / RGB_VALUE_MULTIPLIER), 255)));
}
/**
* Produces a ghosting effect on the shape s.
*
* @param s
* the shape
* @return the ghosted shape
* @since 2.0
*/
public static Shape makeGhostShape(Shape s) {
s.setBackgroundColor(ghostFillColor);
s.setFillXOR(true);
s.setOutlineXOR(true);
return s;
}
/**
* Mixes the passed Colors and returns the resulting Color.
*
* @param c1
* the first color
* @param c2
* the second color
* @param weight
* the first color's weight from 0-1
* @return the new color
* @since 2.0
*/
public static Color mixColors(Color c1, Color c2, double weight) {
return new Color(null, (int) (c1.getRed() * weight + c2.getRed()
* (1 - weight)), (int) (c1.getGreen() * weight + c2.getGreen()
* (1 - weight)), (int) (c1.getBlue() * weight + c2.getBlue()
* (1 - weight)));
}
/**
* Mixes the passed Colors and returns the resulting Color.
*
* @param c1
* the first color
* @param c2
* the second color
* @return the new color
* @since 2.0
*/
public static Color mixColors(Color c1, Color c2) {
if (c1 == null || c2 == null) {
return new Color(null, 0, 255, 0);
}
return new Color(null, (c1.getRed() + c2.getRed()) / 2,
(c1.getGreen() + c2.getGreen()) / 2,
(c1.getBlue() + c2.getBlue()) / 2);
}
/**
* Paints a border with an etching effect, having a shadow of Color
* shadow and highlight of Color highlight.
*
* @param g
* the graphics object
* @param r
* the bounds of the border
* @param shadow
* the shadow color
* @param highlight
* the highlight color
* @since 2.0
*/
public static void paintEtchedBorder(Graphics g, Rectangle r, Color shadow,
Color highlight) {
int x = r.x, y = r.y, w = r.width, h = r.height;
g.setLineStyle(Graphics.LINE_SOLID);
g.setLineWidth(1);
g.setXORMode(false);
w -= 2;
h -= 2;
g.setForegroundColor(shadow);
g.drawRectangle(x, y, w, h);
x++;
y++;
g.setForegroundColor(highlight);
g.drawRectangle(x, y, w, h);
}
/**
* Helper method to paint a grid. Painting is optimized as it is restricted
* to the Graphics' clip.
*
* @param g
* The Graphics object to be used for painting
* @param f
* The figure in which the grid is to be painted
* @param origin
* Any point where the grid lines are expected to intersect
* @param distanceX
* Distance between vertical grid lines; if 0 or less, vertical
* grid lines will not be drawn
* @param distanceY
* Distance between horizontal grid lines; if 0 or less,
* horizontal grid lines will not be drawn
*
* @since 3.0
*/
public static void paintGrid(Graphics g, IFigure f,
org.eclipse.draw2d.geometry.Point origin, int distanceX,
int distanceY) {
Rectangle clip = g.getClip(Rectangle.SINGLETON);
if (distanceX > 0) {
if (origin.x >= clip.x)
while (origin.x - distanceX >= clip.x)
origin.x -= distanceX;
else
while (origin.x < clip.x)
origin.x += distanceX;
for (int i = origin.x; i < clip.x + clip.width; i += distanceX)
g.drawLine(i, clip.y, i, clip.y + clip.height);
}
if (distanceY > 0) {
if (origin.y >= clip.y)
while (origin.y - distanceY >= clip.y)
origin.y -= distanceY;
else
while (origin.y < clip.y)
origin.y += distanceY;
for (int i = origin.y; i < clip.y + clip.height; i += distanceY)
g.drawLine(clip.x, i, clip.x + clip.width, i);
}
}
/**
* Paints a border with an etching effect, having a shadow of a darker
* version of g's background color, and a highlight a lighter version of g's
* background color.
*
* @param g
* the graphics object
* @param r
* the bounds of the border
* @since 2.0
*/
public static void paintEtchedBorder(Graphics g, Rectangle r) {
Color rgb = g.getBackgroundColor(), shadow = darker(rgb), highlight = lighter(rgb);
paintEtchedBorder(g, r, shadow, highlight);
}
/**
* Sets Font to passed value.
*
* @param f
* the new font
* @since 2.0
*/
protected static void setFont(Font f) {
if (appliedFont == f || f.equals(appliedFont))
return;
getGC().setFont(f);
appliedFont = f;
metrics = null;
}
/**
* Returns the figure which is the nearest common ancestor of both figures,
* or null if there is no common ancestor. A figure is an
* ancestor if it is the parent of another figure, or if it is the ancestor
* of that figure's parent. If one figure is the ancestor of the other, it
* is returned as the common ancestor.
*
* @since 3.1
* @param l
* left
* @param r
* right
* @return the common ancestor, if it exists, or null.
*/
public static IFigure findCommonAncestor(IFigure l, IFigure r) {
if (l == r)
return l;
ArrayList left = new ArrayList();
ArrayList right = new ArrayList();
while (l != null) {
left.add(l);
l = l.getParent();
}
while (r != null) {
right.add(r);
r = r.getParent();
}
if (left.isEmpty() || right.isEmpty())
return null;
for (int i = 0; i < left.size(); i++) {
if (right.contains(left.get(i)))
return (IFigure) left.get(i);
}
return null;
}
/**
* Returns true if the ancestor contains the descendant, or is
* the ancestor of the descendant's parent.
*
* @param ancestor
* the ancestor
* @param descendant
* the descendant
* @return true if ancestor
* @since 3.2
*/
public static boolean isAncestor(final IFigure ancestor, IFigure descendant) {
while (descendant != null) {
descendant = descendant.getParent();
if (descendant == ancestor)
return true;
}
return false;
}
/**
* Determines whether the given figure is showing and not (completely)
* clipped.
*
* @param figure
* The figure to test
* @return true if the given figure is showing and not
* completely clipped, false otherwise.
* @since 3.7
*/
public static boolean isNotFullyClipped(IFigure figure) {
if (figure == null || !figure.isShowing()) {
return false;
}
// check if figure is clipped
// TODO: IClippingStrategy has to be taken into consideration as well.
Rectangle figBounds = figure.getBounds().getCopy();
IFigure walker = figure.getParent();
while (!figBounds.isEmpty() && walker != null) {
walker.translateToParent(figBounds);
figBounds.intersect(walker.getBounds());
walker = walker.getParent();
}
return !figBounds.isEmpty();
}
}
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