simple.server.extension.d20.StdDraw Maven / Gradle / Ivy
package simple.server.extension.d20;
/**
* ***********************************************************************
* Compilation: javac StdDraw.java Execution: java StdDraw
*
* Standard drawing library. This class provides a basic capability for creating
* drawings with your programs. It uses a simple graphics model that allows you
* to create drawings consisting of points, lines, and curves in a window on
* your computer and to save the drawings to a file.
*
* Todo ---- - Add support for gradient fill, etc.
*
* Remarks ------- - don't use AffineTransform for rescaling since it inverts
* images and strings - careful using setFont in inner loop within an animation
* - it can cause flicker
*
************************************************************************
*/
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.awt.image.BufferedImage;
import java.awt.image.DirectColorModel;
import java.awt.image.WritableRaster;
import java.io.File;
import java.io.IOException;
import java.net.URL;
import java.util.LinkedList;
import java.util.TreeSet;
import javax.imageio.ImageIO;
import javax.swing.*;
/**
* Standard draw. This class provides a basic capability for creating
* drawings with your programs. It uses a simple graphics model that allows you
* to create drawings consisting of points, lines, and curves in a window on
* your computer and to save the drawings to a file.
*
* For additional documentation, see
* Section 1.5 of
* Introduction to Programming in Java: An Interdisciplinary Approach by
* Robert Sedgewick and Kevin Wayne.
*/
public final class StdDraw implements ActionListener, MouseListener, MouseMotionListener, KeyListener {
// pre-defined colors
public static final Color BLACK = Color.BLACK;
public static final Color BLUE = Color.BLUE;
public static final Color CYAN = Color.CYAN;
public static final Color DARK_GRAY = Color.DARK_GRAY;
public static final Color GRAY = Color.GRAY;
public static final Color GREEN = Color.GREEN;
public static final Color LIGHT_GRAY = Color.LIGHT_GRAY;
public static final Color MAGENTA = Color.MAGENTA;
public static final Color ORANGE = Color.ORANGE;
public static final Color PINK = Color.PINK;
public static final Color RED = Color.RED;
public static final Color WHITE = Color.WHITE;
public static final Color YELLOW = Color.YELLOW;
/**
* Shade of blue used in Introduction to Programming in Java. It is Pantone
* 300U. The RGB values are approximately (9, 90, 266).
*/
public static final Color BOOK_BLUE = new Color(9, 90, 166);
public static final Color BOOK_LIGHT_BLUE = new Color(103, 198, 243);
/**
* Shade of red used in Algorithms 4th edition. It is Pantone 1805U. The RGB
* values are approximately (150, 35, 31).
*/
public static final Color BOOK_RED = new Color(150, 35, 31);
// default colors
private static final Color DEFAULT_PEN_COLOR = BLACK;
private static final Color DEFAULT_CLEAR_COLOR = WHITE;
// current pen color
private static Color penColor;
// default canvas size is DEFAULT_SIZE-by-DEFAULT_SIZE
private static final int DEFAULT_SIZE = 512;
private static int width = DEFAULT_SIZE;
private static int height = DEFAULT_SIZE;
// default pen radius
private static final double DEFAULT_PEN_RADIUS = 0.002;
// current pen radius
private static double penRadius;
// show we draw immediately or wait until next show?
private static boolean defer = false;
// boundary of drawing canvas, 5% border
private static final double BORDER = 0.05;
private static final double DEFAULT_XMIN = 0.0;
private static final double DEFAULT_XMAX = 1.0;
private static final double DEFAULT_YMIN = 0.0;
private static final double DEFAULT_YMAX = 1.0;
private static double xmin, ymin, xmax, ymax;
// for synchronization
private final static Object mouseLock = new Object();
private final static Object keyLock = new Object();
// default font
private static final Font DEFAULT_FONT = new Font("SansSerif", Font.PLAIN, 16);
// current font
private static Font font;
// double buffered graphics
private static BufferedImage offscreenImage, onscreenImage;
private static Graphics2D offscreen, onscreen;
// singleton for callbacks: avoids generation of extra .class files
private static StdDraw std = new StdDraw();
// the frame for drawing to the screen
private static JFrame frame;
// mouse state
private static boolean mousePressed = false;
private static double mouseX = 0;
private static double mouseY = 0;
// queue of typed key characters
private static LinkedList keysTyped = new LinkedList<>();
// set of key codes currently pressed down
private static TreeSet keysDown = new TreeSet<>();
// not instantiable
private StdDraw() {
}
// static initializer
static {
init();
}
/**
* Set the window size to the default size 512-by-512 pixels.
*/
public static void setCanvasSize() {
setCanvasSize(DEFAULT_SIZE, DEFAULT_SIZE);
}
/**
* Set the window size to w-by-h pixels.
*
* @param w the width as a number of pixels
* @param h the height as a number of pixels
* @throws a RunTimeException if the width or height is 0 or negative
*/
public static void setCanvasSize(int w, int h) {
if (w < 1 || h < 1) {
throw new RuntimeException("width and height must be positive");
}
width = w;
height = h;
init();
}
// init
private static void init() {
if (frame != null) {
frame.setVisible(false);
}
frame = new JFrame();
offscreenImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
onscreenImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
offscreen = offscreenImage.createGraphics();
onscreen = onscreenImage.createGraphics();
setXscale();
setYscale();
offscreen.setColor(DEFAULT_CLEAR_COLOR);
offscreen.fillRect(0, 0, width, height);
setPenColor();
setPenRadius();
setFont();
clear();
// add antialiasing
RenderingHints hints = new RenderingHints(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
hints.put(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
offscreen.addRenderingHints(hints);
// frame stuff
ImageIcon icon = new ImageIcon(onscreenImage);
JLabel draw = new JLabel(icon);
draw.addMouseListener(std);
draw.addMouseMotionListener(std);
frame.setContentPane(draw);
frame.addKeyListener(std); // JLabel cannot get keyboard focus
frame.setResizable(false);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // closes all windows
// frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); // closes only current window
frame.setTitle("Standard Draw");
frame.setJMenuBar(createMenuBar());
frame.pack();
frame.requestFocusInWindow();
frame.setVisible(true);
}
// create the menu bar (changed to private)
private static JMenuBar createMenuBar() {
JMenuBar menuBar = new JMenuBar();
JMenu menu = new JMenu("File");
menuBar.add(menu);
JMenuItem menuItem1 = new JMenuItem(" Save... ");
menuItem1.addActionListener(std);
menuItem1.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S,
Toolkit.getDefaultToolkit().getMenuShortcutKeyMask()));
menu.add(menuItem1);
return menuBar;
}
/**
* ***********************************************************************
* User and screen coordinate systems
* ***********************************************************************
*/
/**
* Set the x-scale to be the default (between 0.0 and 1.0).
*/
public static void setXscale() {
setXscale(DEFAULT_XMIN, DEFAULT_XMAX);
}
/**
* Set the y-scale to be the default (between 0.0 and 1.0).
*/
public static void setYscale() {
setYscale(DEFAULT_YMIN, DEFAULT_YMAX);
}
/**
* Set the x-scale (a 10% border is added to the values)
*
* @param min the minimum value of the x-scale
* @param max the maximum value of the x-scale
*/
public static void setXscale(double min, double max) {
double size = max - min;
xmin = min - BORDER * size;
xmax = max + BORDER * size;
}
/**
* Set the y-scale (a 10% border is added to the values).
*
* @param min the minimum value of the y-scale
* @param max the maximum value of the y-scale
*/
public static void setYscale(double min, double max) {
double size = max - min;
ymin = min - BORDER * size;
ymax = max + BORDER * size;
}
/**
* Set the x-scale and y-scale (a 10% border is added to the values)
*
* @param min the minimum value of the x- and y-scales
* @param max the maximum value of the x- and y-scales
*/
public static void setScale(double min, double max) {
setXscale(min, max);
setYscale(min, max);
}
// helper functions that scale from user coordinates to screen coordinates and back
private static double scaleX(double x) {
return width * (x - xmin) / (xmax - xmin);
}
private static double scaleY(double y) {
return height * (ymax - y) / (ymax - ymin);
}
private static double factorX(double w) {
return w * width / Math.abs(xmax - xmin);
}
private static double factorY(double h) {
return h * height / Math.abs(ymax - ymin);
}
private static double userX(double x) {
return xmin + x * (xmax - xmin) / width;
}
private static double userY(double y) {
return ymax - y * (ymax - ymin) / height;
}
/**
* Clear the screen to the default color (white).
*/
public static void clear() {
clear(DEFAULT_CLEAR_COLOR);
}
/**
* Clear the screen to the given color.
*
* @param color the Color to make the background
*/
public static void clear(Color color) {
offscreen.setColor(color);
offscreen.fillRect(0, 0, width, height);
offscreen.setColor(penColor);
draw();
}
/**
* Get the current pen radius.
*/
public static double getPenRadius() {
return penRadius;
}
/**
* Set the pen size to the default (.002).
*/
public static void setPenRadius() {
setPenRadius(DEFAULT_PEN_RADIUS);
}
/**
* Set the radius of the pen to the given size.
*
* @param r the radius of the pen
* @throws RuntimeException if r is negative
*/
public static void setPenRadius(double r) {
if (r < 0) {
throw new RuntimeException("pen radius must be positive");
}
penRadius = r * DEFAULT_SIZE;
BasicStroke stroke = new BasicStroke((float) penRadius, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND);
// BasicStroke stroke = new BasicStroke((float) penRadius);
offscreen.setStroke(stroke);
}
/**
* Get the current pen color.
*/
public static Color getPenColor() {
return penColor;
}
/**
* Set the pen color to the default color (black).
*/
public static void setPenColor() {
setPenColor(DEFAULT_PEN_COLOR);
}
/**
* Set the pen color to the given color. The available pen colors are BLACK,
* BLUE, CYAN, DARK_GRAY, GRAY, GREEN, LIGHT_GRAY, MAGENTA, ORANGE, PINK,
* RED, WHITE, and YELLOW.
*
* @param color the Color to make the pen
*/
public static void setPenColor(Color color) {
penColor = color;
offscreen.setColor(penColor);
}
/**
* Get the current font.
*/
public static Font getFont() {
return font;
}
/**
* Set the font to the default font (sans serif, 16 point).
*/
public static void setFont() {
setFont(DEFAULT_FONT);
}
/**
* Set the font to the given value.
*
* @param f the font to make text
*/
public static void setFont(Font f) {
font = f;
}
/**
* ***********************************************************************
* Drawing geometric shapes.
* ***********************************************************************
*/
/**
* Draw a line from (x0, y0) to (x1, y1).
*
* @param x0 the x-coordinate of the starting point
* @param y0 the y-coordinate of the starting point
* @param x1 the x-coordinate of the destination point
* @param y1 the y-coordinate of the destination point
*/
public static void line(double x0, double y0, double x1, double y1) {
offscreen.draw(new Line2D.Double(scaleX(x0), scaleY(y0), scaleX(x1), scaleY(y1)));
draw();
}
/**
* Draw one pixel at (x, y).
*
* @param x the x-coordinate of the pixel
* @param y the y-coordinate of the pixel
*/
private static void pixel(double x, double y) {
offscreen.fillRect((int) Math.round(scaleX(x)), (int) Math.round(scaleY(y)), 1, 1);
}
/**
* Draw a point at (x, y).
*
* @param x the x-coordinate of the point
* @param y the y-coordinate of the point
*/
public static void point(double x, double y) {
double xs = scaleX(x);
double ys = scaleY(y);
double r = penRadius;
// double ws = factorX(2*r);
// double hs = factorY(2*r);
// if (ws <= 1 && hs <= 1) pixel(x, y);
if (r <= 1) {
pixel(x, y);
} else {
offscreen.fill(new Ellipse2D.Double(xs - r / 2, ys - r / 2, r, r));
}
draw();
}
/**
* Draw a circle of radius r, centered on (x, y).
*
* @param x the x-coordinate of the center of the circle
* @param y the y-coordinate of the center of the circle
* @param r the radius of the circle
* @throws RuntimeException if the radius of the circle is negative
*/
public static void circle(double x, double y, double r) {
if (r < 0) {
throw new RuntimeException("circle radius can't be negative");
}
double xs = scaleX(x);
double ys = scaleY(y);
double ws = factorX(2 * r);
double hs = factorY(2 * r);
if (ws <= 1 && hs <= 1) {
pixel(x, y);
} else {
offscreen.draw(new Ellipse2D.Double(xs - ws / 2, ys - hs / 2, ws, hs));
}
draw();
}
/**
* Draw filled circle of radius r, centered on (x, y).
*
* @param x the x-coordinate of the center of the circle
* @param y the y-coordinate of the center of the circle
* @param r the radius of the circle
* @throws RuntimeException if the radius of the circle is negative
*/
public static void filledCircle(double x, double y, double r) {
if (r < 0) {
throw new RuntimeException("circle radius can't be negative");
}
double xs = scaleX(x);
double ys = scaleY(y);
double ws = factorX(2 * r);
double hs = factorY(2 * r);
if (ws <= 1 && hs <= 1) {
pixel(x, y);
} else {
offscreen.fill(new Ellipse2D.Double(xs - ws / 2, ys - hs / 2, ws, hs));
}
draw();
}
/**
* Draw an ellipse with given semimajor and semiminor axes, centered on (x,
* y).
*
* @param x the x-coordinate of the center of the ellipse
* @param y the y-coordinate of the center of the ellipse
* @param semiMajorAxis is the semimajor axis of the ellipse
* @param semiMinorAxis is the semiminor axis of the ellipse
* @throws RuntimeException if either of the axes are negative
*/
public static void ellipse(double x, double y, double semiMajorAxis, double semiMinorAxis) {
if (semiMajorAxis < 0) {
throw new RuntimeException("ellipse semimajor axis can't be negative");
}
if (semiMinorAxis < 0) {
throw new RuntimeException("ellipse semiminor axis can't be negative");
}
double xs = scaleX(x);
double ys = scaleY(y);
double ws = factorX(2 * semiMajorAxis);
double hs = factorY(2 * semiMinorAxis);
if (ws <= 1 && hs <= 1) {
pixel(x, y);
} else {
offscreen.draw(new Ellipse2D.Double(xs - ws / 2, ys - hs / 2, ws, hs));
}
draw();
}
/**
* Draw an ellipse with given semimajor and semiminor axes, centered on (x,
* y).
*
* @param x the x-coordinate of the center of the ellipse
* @param y the y-coordinate of the center of the ellipse
* @param semiMajorAxis is the semimajor axis of the ellipse
* @param semiMinorAxis is the semiminor axis of the ellipse
* @throws RuntimeException if either of the axes are negative
*/
public static void filledEllipse(double x, double y, double semiMajorAxis, double semiMinorAxis) {
if (semiMajorAxis < 0) {
throw new RuntimeException("ellipse semimajor axis can't be negative");
}
if (semiMinorAxis < 0) {
throw new RuntimeException("ellipse semiminor axis can't be negative");
}
double xs = scaleX(x);
double ys = scaleY(y);
double ws = factorX(2 * semiMajorAxis);
double hs = factorY(2 * semiMinorAxis);
if (ws <= 1 && hs <= 1) {
pixel(x, y);
} else {
offscreen.fill(new Ellipse2D.Double(xs - ws / 2, ys - hs / 2, ws, hs));
}
draw();
}
/**
* Draw an arc of radius r, centered on (x, y), from angle1 to angle2 (in
* degrees).
*
* @param x the x-coordinate of the center of the circle
* @param y the y-coordinate of the center of the circle
* @param r the radius of the circle
* @param angle1 the starting angle. 0 would mean an arc beginning at 3
* o'clock.
* @param angle2 the angle at the end of the arc. For example, if you want a
* 90 degree arc, then angle2 should be angle1 + 90.
* @throws RuntimeException if the radius of the circle is negative
*/
public static void arc(double x, double y, double r, double angle1, double angle2) {
if (r < 0) {
throw new RuntimeException("arc radius can't be negative");
}
while (angle2 < angle1) {
angle2 += 360;
}
double xs = scaleX(x);
double ys = scaleY(y);
double ws = factorX(2 * r);
double hs = factorY(2 * r);
if (ws <= 1 && hs <= 1) {
pixel(x, y);
} else {
offscreen.draw(new Arc2D.Double(xs - ws / 2, ys - hs / 2, ws, hs, angle1, angle2 - angle1, Arc2D.OPEN));
}
draw();
}
/**
* Draw a square of side length 2r, centered on (x, y).
*
* @param x the x-coordinate of the center of the square
* @param y the y-coordinate of the center of the square
* @param r radius is half the length of any side of the square
* @throws RuntimeException if r is negative
*/
public static void square(double x, double y, double r) {
if (r < 0) {
throw new RuntimeException("square side length can't be negative");
}
double xs = scaleX(x);
double ys = scaleY(y);
double ws = factorX(2 * r);
double hs = factorY(2 * r);
if (ws <= 1 && hs <= 1) {
pixel(x, y);
} else {
offscreen.draw(new Rectangle2D.Double(xs - ws / 2, ys - hs / 2, ws, hs));
}
draw();
}
/**
* Draw a filled square of side length 2r, centered on (x, y).
*
* @param x the x-coordinate of the center of the square
* @param y the y-coordinate of the center of the square
* @param r radius is half the length of any side of the square
* @throws RuntimeException if r is negative
*/
public static void filledSquare(double x, double y, double r) {
if (r < 0) {
throw new RuntimeException("square side length can't be negative");
}
double xs = scaleX(x);
double ys = scaleY(y);
double ws = factorX(2 * r);
double hs = factorY(2 * r);
if (ws <= 1 && hs <= 1) {
pixel(x, y);
} else {
offscreen.fill(new Rectangle2D.Double(xs - ws / 2, ys - hs / 2, ws, hs));
}
draw();
}
/**
* Draw a rectangle of given half width and half height, centered on (x, y).
*
* @param x the x-coordinate of the center of the rectangle
* @param y the y-coordinate of the center of the rectangle
* @param halfWidth is half the width of the rectangle
* @param halfHeight is half the height of the rectangle
* @throws RuntimeException if halfWidth or halfHeight is negative
*/
public static void rectangle(double x, double y, double halfWidth, double halfHeight) {
if (halfWidth < 0) {
throw new RuntimeException("half width can't be negative");
}
if (halfHeight < 0) {
throw new RuntimeException("half height can't be negative");
}
double xs = scaleX(x);
double ys = scaleY(y);
double ws = factorX(2 * halfWidth);
double hs = factorY(2 * halfHeight);
if (ws <= 1 && hs <= 1) {
pixel(x, y);
} else {
offscreen.draw(new Rectangle2D.Double(xs - ws / 2, ys - hs / 2, ws, hs));
}
draw();
}
/**
* Draw a filled rectangle of given half width and half height, centered on
* (x, y).
*
* @param x the x-coordinate of the center of the rectangle
* @param y the y-coordinate of the center of the rectangle
* @param halfWidth is half the width of the rectangle
* @param halfHeight is half the height of the rectangle
* @throws RuntimeException if halfWidth or halfHeight is negative
*/
public static void filledRectangle(double x, double y, double halfWidth, double halfHeight) {
if (halfWidth < 0) {
throw new RuntimeException("half width can't be negative");
}
if (halfHeight < 0) {
throw new RuntimeException("half height can't be negative");
}
double xs = scaleX(x);
double ys = scaleY(y);
double ws = factorX(2 * halfWidth);
double hs = factorY(2 * halfHeight);
if (ws <= 1 && hs <= 1) {
pixel(x, y);
} else {
offscreen.fill(new Rectangle2D.Double(xs - ws / 2, ys - hs / 2, ws, hs));
}
draw();
}
/**
* Draw a polygon with the given (x[i], y[i]) coordinates.
*
* @param x an array of all the x-coordindates of the polygon
* @param y an array of all the y-coordindates of the polygon
*/
public static void polygon(double[] x, double[] y) {
int N = x.length;
GeneralPath path = new GeneralPath();
path.moveTo((float) scaleX(x[0]), (float) scaleY(y[0]));
for (int i = 0; i < N; i++) {
path.lineTo((float) scaleX(x[i]), (float) scaleY(y[i]));
}
path.closePath();
offscreen.draw(path);
draw();
}
/**
* Draw a filled polygon with the given (x[i], y[i]) coordinates.
*
* @param x an array of all the x-coordindates of the polygon
* @param y an array of all the y-coordindates of the polygon
*/
public static void filledPolygon(double[] x, double[] y) {
int N = x.length;
GeneralPath path = new GeneralPath();
path.moveTo((float) scaleX(x[0]), (float) scaleY(y[0]));
for (int i = 0; i < N; i++) {
path.lineTo((float) scaleX(x[i]), (float) scaleY(y[i]));
}
path.closePath();
offscreen.fill(path);
draw();
}
/**
* ***********************************************************************
* Drawing images.
* ***********************************************************************
*/
// get an image from the given filename
private static Image getImage(String filename) {
// to read from file
ImageIcon icon = new ImageIcon(filename);
// try to read from URL
if ((icon == null) || (icon.getImageLoadStatus() != MediaTracker.COMPLETE)) {
try {
URL url = new URL(filename);
icon = new ImageIcon(url);
} catch (Exception e) { /*
* not a url
*/ }
}
// in case file is inside a .jar
if ((icon == null) || (icon.getImageLoadStatus() != MediaTracker.COMPLETE)) {
URL url = StdDraw.class.getResource(filename);
if (url == null) {
throw new RuntimeException("image " + filename + " not found");
}
icon = new ImageIcon(url);
}
return icon.getImage();
}
/**
* Draw picture (gif, jpg, or png) centered on (x, y).
*
* @param x the center x-coordinate of the image
* @param y the center y-coordinate of the image
* @param s the name of the image/picture, e.g., "ball.gif"
* @throws RuntimeException if the image is corrupt
*/
public static void picture(double x, double y, String s) {
Image image = getImage(s);
double xs = scaleX(x);
double ys = scaleY(y);
int ws = image.getWidth(null);
int hs = image.getHeight(null);
if (ws < 0 || hs < 0) {
throw new RuntimeException("image " + s + " is corrupt");
}
offscreen.drawImage(image, (int) Math.round(xs - ws / 2.0), (int) Math.round(ys - hs / 2.0), null);
draw();
}
/**
* Draw picture (gif, jpg, or png) centered on (x, y), rotated given number
* of degrees
*
* @param x the center x-coordinate of the image
* @param y the center y-coordinate of the image
* @param s the name of the image/picture, e.g., "ball.gif"
* @param degrees is the number of degrees to rotate counterclockwise
* @throws RuntimeException if the image is corrupt
*/
public static void picture(double x, double y, String s, double degrees) {
Image image = getImage(s);
double xs = scaleX(x);
double ys = scaleY(y);
int ws = image.getWidth(null);
int hs = image.getHeight(null);
if (ws < 0 || hs < 0) {
throw new RuntimeException("image " + s + " is corrupt");
}
offscreen.rotate(Math.toRadians(-degrees), xs, ys);
offscreen.drawImage(image, (int) Math.round(xs - ws / 2.0), (int) Math.round(ys - hs / 2.0), null);
offscreen.rotate(Math.toRadians(+degrees), xs, ys);
draw();
}
/**
* Draw picture (gif, jpg, or png) centered on (x, y), rescaled to w-by-h.
*
* @param x the center x coordinate of the image
* @param y the center y coordinate of the image
* @param s the name of the image/picture, e.g., "ball.gif"
* @param w the width of the image
* @param h the height of the image
* @throws RuntimeException if the width height are negative
* @throws RuntimeException if the image is corrupt
*/
public static void picture(double x, double y, String s, double w, double h) {
Image image = getImage(s);
double xs = scaleX(x);
double ys = scaleY(y);
if (w < 0) {
throw new RuntimeException("width is negative: " + w);
}
if (h < 0) {
throw new RuntimeException("height is negative: " + h);
}
double ws = factorX(w);
double hs = factorY(h);
if (ws < 0 || hs < 0) {
throw new RuntimeException("image " + s + " is corrupt");
}
if (ws <= 1 && hs <= 1) {
pixel(x, y);
} else {
offscreen.drawImage(image, (int) Math.round(xs - ws / 2.0),
(int) Math.round(ys - hs / 2.0),
(int) Math.round(ws),
(int) Math.round(hs), null);
}
draw();
}
/**
* Draw picture (gif, jpg, or png) centered on (x, y), rotated given number
* of degrees, rescaled to w-by-h.
*
* @param x the center x-coordinate of the image
* @param y the center y-coordinate of the image
* @param s the name of the image/picture, e.g., "ball.gif"
* @param w the width of the image
* @param h the height of the image
* @param degrees is the number of degrees to rotate counterclockwise
* @throws RuntimeException if the image is corrupt
*/
public static void picture(double x, double y, String s, double w, double h, double degrees) {
Image image = getImage(s);
double xs = scaleX(x);
double ys = scaleY(y);
double ws = factorX(w);
double hs = factorY(h);
if (ws < 0 || hs < 0) {
throw new RuntimeException("image " + s + " is corrupt");
}
if (ws <= 1 && hs <= 1) {
pixel(x, y);
}
offscreen.rotate(Math.toRadians(-degrees), xs, ys);
offscreen.drawImage(image, (int) Math.round(xs - ws / 2.0),
(int) Math.round(ys - hs / 2.0),
(int) Math.round(ws),
(int) Math.round(hs), null);
offscreen.rotate(Math.toRadians(+degrees), xs, ys);
draw();
}
/**
* ***********************************************************************
* Drawing text.
* ***********************************************************************
*/
/**
* Write the given text string in the current font, centered on (x, y).
*
* @param x the center x-coordinate of the text
* @param y the center y-coordinate of the text
* @param s the text
*/
public static void text(double x, double y, String s) {
offscreen.setFont(font);
FontMetrics metrics = offscreen.getFontMetrics();
double xs = scaleX(x);
double ys = scaleY(y);
int ws = metrics.stringWidth(s);
int hs = metrics.getDescent();
offscreen.drawString(s, (float) (xs - ws / 2.0), (float) (ys + hs));
draw();
}
/**
* Write the given text string in the current font, centered on (x, y) and
* rotated by the specified number of degrees
*
* @param x the center x-coordinate of the text
* @param y the center y-coordinate of the text
* @param s the text
* @param degrees is the number of degrees to rotate counterclockwise
*/
public static void text(double x, double y, String s, double degrees) {
double xs = scaleX(x);
double ys = scaleY(y);
offscreen.rotate(Math.toRadians(-degrees), xs, ys);
text(x, y, s);
offscreen.rotate(Math.toRadians(+degrees), xs, ys);
}
/**
* Write the given text string in the current font, left-aligned at (x, y).
*
* @param x the x-coordinate of the text
* @param y the y-coordinate of the text
* @param s the text
*/
public static void textLeft(double x, double y, String s) {
offscreen.setFont(font);
FontMetrics metrics = offscreen.getFontMetrics();
double xs = scaleX(x);
double ys = scaleY(y);
int hs = metrics.getDescent();
offscreen.drawString(s, (float) (xs), (float) (ys + hs));
draw();
}
/**
* Write the given text string in the current font, right-aligned at (x, y).
*
* @param x the x-coordinate of the text
* @param y the y-coordinate of the text
* @param s the text
*/
public static void textRight(double x, double y, String s) {
offscreen.setFont(font);
FontMetrics metrics = offscreen.getFontMetrics();
double xs = scaleX(x);
double ys = scaleY(y);
int ws = metrics.stringWidth(s);
int hs = metrics.getDescent();
offscreen.drawString(s, (float) (xs - ws), (float) (ys + hs));
draw();
}
/**
* Display on screen, pause for t milliseconds, and turn on animation
* mode: subsequent calls to drawing methods such as line(),
* circle(), and square() will not be displayed on screen
* until the next call to show(). This is useful for producing
* animations (clear the screen, draw a bunch of shapes, display on screen
* for a fixed amount of time, and repeat). It also speeds up drawing a huge
* number of shapes (call show(0) to defer drawing on screen, draw
* the shapes, and call show(0) to display them all on screen at
* once).
*
* @param t number of milliseconds
*/
public static void show(int t) {
defer = false;
draw();
try {
Thread.sleep(t);
} catch (InterruptedException e) {
System.out.println("Error sleeping");
}
defer = true;
}
/**
* Display on-screen and turn off animation mode: subsequent calls to
* drawing methods such as line(), circle(), and
* square() will be displayed on screen when called. This is the
* default.
*/
public static void show() {
defer = false;
draw();
}
// draw onscreen if defer is false
private static void draw() {
if (defer) {
return;
}
onscreen.drawImage(offscreenImage, 0, 0, null);
frame.repaint();
}
/**
* ***********************************************************************
* Save drawing to a file.
* ***********************************************************************
*/
/**
* Save onscreen image to file - suffix must be png, jpg, or gif.
*
* @param filename the name of the file with one of the required suffixes
*/
public static void save(String filename) {
File file = new File(filename);
String suffix = filename.substring(filename.lastIndexOf('.') + 1);
// png files
switch (suffix.toLowerCase()) {
// need to change from ARGB to RGB for jpeg
case "png":
try {
ImageIO.write(onscreenImage, suffix, file);
} catch (IOException e) {
e.printStackTrace();
} break;
case "jpg":
WritableRaster raster = onscreenImage.getRaster();
WritableRaster newRaster;
newRaster = raster.createWritableChild(0, 0, width, height, 0, 0, new int[]{0, 1, 2});
DirectColorModel cm = (DirectColorModel) onscreenImage.getColorModel();
DirectColorModel newCM = new DirectColorModel(cm.getPixelSize(),
cm.getRedMask(),
cm.getGreenMask(),
cm.getBlueMask());
BufferedImage rgbBuffer = new BufferedImage(newCM, newRaster, false, null);
try {
ImageIO.write(rgbBuffer, suffix, file);
} catch (IOException e) {
e.printStackTrace();
} break;
default:
System.out.println("Invalid image file type: " + suffix);
break;
}
}
/**
* This method cannot be called directly.
*/
@Override
public void actionPerformed(ActionEvent e) {
FileDialog chooser = new FileDialog(StdDraw.frame, "Use a .png or .jpg extension", FileDialog.SAVE);
chooser.setVisible(true);
String filename = chooser.getFile();
if (filename != null) {
StdDraw.save(chooser.getDirectory() + File.separator + chooser.getFile());
}
}
/**
* ***********************************************************************
* Mouse interactions.
* ***********************************************************************
*/
/**
* Is the mouse being pressed?
*
* @return true or false
*/
public static boolean mousePressed() {
synchronized (mouseLock) {
return mousePressed;
}
}
/**
* What is the x-coordinate of the mouse?
*
* @return the value of the x-coordinate of the mouse
*/
public static double mouseX() {
synchronized (mouseLock) {
return mouseX;
}
}
/**
* What is the y-coordinate of the mouse?
*
* @return the value of the y-coordinate of the mouse
*/
public static double mouseY() {
synchronized (mouseLock) {
return mouseY;
}
}
/**
* This method cannot be called directly.
*/
@Override
public void mouseClicked(MouseEvent e) {
}
/**
* This method cannot be called directly.
*/
@Override
public void mouseEntered(MouseEvent e) {
}
/**
* This method cannot be called directly.
*/
@Override
public void mouseExited(MouseEvent e) {
}
/**
* This method cannot be called directly.
*/
@Override
public void mousePressed(MouseEvent e) {
synchronized (mouseLock) {
mouseX = StdDraw.userX(e.getX());
mouseY = StdDraw.userY(e.getY());
mousePressed = true;
}
}
/**
* This method cannot be called directly.
*/
@Override
public void mouseReleased(MouseEvent e) {
synchronized (mouseLock) {
mousePressed = false;
}
}
/**
* This method cannot be called directly.
*/
@Override
public void mouseDragged(MouseEvent e) {
synchronized (mouseLock) {
mouseX = StdDraw.userX(e.getX());
mouseY = StdDraw.userY(e.getY());
}
}
/**
* This method cannot be called directly.
*/
@Override
public void mouseMoved(MouseEvent e) {
synchronized (mouseLock) {
mouseX = StdDraw.userX(e.getX());
mouseY = StdDraw.userY(e.getY());
}
}
/**
* ***********************************************************************
* Keyboard interactions.
* ***********************************************************************
*/
/**
* Has the user typed a key?
*
* @return true if the user has typed a key, false otherwise
*/
public static boolean hasNextKeyTyped() {
synchronized (keyLock) {
return !keysTyped.isEmpty();
}
}
/**
* What is the next key that was typed by the user? This method returns a
* Unicode character corresponding to the key typed (such as 'a' or 'A'). It
* cannot identify action keys (such as F1 and arrow keys) or modifier keys
* (such as control).
*
* @return the next Unicode key typed
*/
public static char nextKeyTyped() {
synchronized (keyLock) {
return keysTyped.removeLast();
}
}
/**
* Is the keycode currently being pressed? This method takes as an argument
* the keycode (corresponding to a physical key). It can handle action keys
* (such as F1 and arrow keys) and modifier keys (such as shift and
* control). See KeyEvent.java
* for a description of key codes.
*
* @return true if keycode is currently being pressed, false otherwise
*/
public static boolean isKeyPressed(int keycode) {
return keysDown.contains(keycode);
}
/**
* This method cannot be called directly.
*/
@Override
public void keyTyped(KeyEvent e) {
synchronized (keyLock) {
keysTyped.addFirst(e.getKeyChar());
}
}
/**
* This method cannot be called directly.
*/
@Override
public void keyPressed(KeyEvent e) {
keysDown.add(e.getKeyCode());
}
/**
* This method cannot be called directly.
*/
@Override
public void keyReleased(KeyEvent e) {
keysDown.remove(e.getKeyCode());
}
/**
* Test client.
*/
public static void main(String[] args) {
StdDraw.square(.2, .8, .1);
StdDraw.filledSquare(.8, .8, .2);
StdDraw.circle(.8, .2, .2);
StdDraw.setPenColor(StdDraw.BOOK_RED);
StdDraw.setPenRadius(.02);
StdDraw.arc(.8, .2, .1, 200, 45);
// draw a blue diamond
StdDraw.setPenRadius();
StdDraw.setPenColor(StdDraw.BOOK_BLUE);
double[] x = {.1, .2, .3, .2};
double[] y = {.2, .3, .2, .1};
StdDraw.filledPolygon(x, y);
// text
StdDraw.setPenColor(StdDraw.BLACK);
StdDraw.text(0.2, 0.5, "black text");
StdDraw.setPenColor(StdDraw.WHITE);
StdDraw.text(0.8, 0.8, "white text");
}
}