I have an circle in my java program. Its just a simple circle like this:
private BufferedImage img;
Graphics2D g = img.createGraphics();
g.fill(new Area(new Ellipse2D.Double(x, y, diam, diam)));
Now i want to insert an image into the circle. I know how i can create an image with the drawImage like this:
image = Toolkit.getDefaultToolkit().getImage(url);
g2.drawImage(image, x, y, WIDTH, HEIGHT, null);
But how can i create an image inside a circle?
Edit: I tried to do the clipping as ControlAltDel suggested but it is not working and i dont know why. My code is bellow. My program works fine with just simple yellow circles. In the file Pang.java i tried to replace the line: g.fill(bubbles[i].getBubbleArea()); by: Image image = new ImageIcon("bubble.png").getImage(); g.clip(new Ellipse2D.Double(100, 100, 50, 5)); g.drawImage(image, 150, 180, null); but its not working and i donst get any errors. What am i doing wrong?
Pang.java:
package pang.gui;
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.awt.image.BufferedImage;
import java.awt.TexturePaint;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.*;
class ShapeCollision {
private BufferedImage img;
private Area limits;
private int w = 800;// width of the game window
private int h = 400;// heigth of the game window
// private Bubble bubble = new Bubble(w, h);
private Bubble[] bubbles = new Bubble[4];
ShapeCollision() {
img = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
/**
* global image of the game shown in the window. This image will be
* added to the JLabel (imageLabel)
*/
final JLabel imageLabel = new JLabel(new ImageIcon(img));
/**
* JLabel that contains the global image of the game
*/
for (int i = 0; i < bubbles.length; i++) {
bubbles[i] = new Bubble(40 + i * 80, 40 + i * 80,i);
}
limits = new Area(new Rectangle(0, 0, w, h));
/**
* game limits or painted area
*/
ActionListener animate = new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
animate();
imageLabel.repaint();
}
};
Timer timer = new Timer(50, animate);
/**
* Repaint rate
*/
timer.start();
JOptionPane.showMessageDialog(null, imageLabel);
timer.stop();
}
public void animate() {
Graphics2D g = img.createGraphics();
/**
* Creates a Graphics2D, which can be used to draw into this
* BufferedImage (img).
*/
g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
/**
* removes edges from the shape, makes rounder objects
*/
g.setColor(Color.BLUE);
/**
* color of the game windows background
*/
g.fillRect(0, 0, img.getWidth(), img.getHeight());
/**
* size of the Graphics2D object (g). In this case the game window is
* filled
*/
for (Bubble bubble : bubbles) {
bubble.IncrementPos();
bubbleWallCollision(bubble);
}
for (Bubble bubble : bubbles) {
detectBubblesCollisions(bubble);
}
g.setColor(Color.YELLOW);
for (int i = 0; i < bubbles.length; i++) {
//Image image = new ImageIcon("bubble.png").getImage();
//g.clip(new Ellipse2D.Double(100, 100, 50,
// 5));
//g.drawImage(image, 150, 180, null);
g.fill(bubbles[i].getBubbleArea());
/**
* the bubble is filled *after* the obstacles, so the bubble is
* allways shown. If the bubble is on top of an abstacle that
* obstacle is covered by the bubble
*/
}
g.dispose();
}
private void detectBubblesCollisions(Bubble bubble1) {
for (Bubble bubble : bubbles) {
if (bubble1 != bubble) {
if (bubble1.getX() + bubble1.getBubbleDiam() / 2
+ bubble.getBubbleDiam() / 2 > bubble.getX()
&& bubble1.getX() < bubble.getX()
+ bubble1.getBubbleDiam() / 2
+ bubble.getBubbleDiam() / 2
&& bubble1.getY() + bubble1.getBubbleDiam() / 2
+ bubble.getBubbleDiam() / 2 > bubble.getY()
&& bubble1.getY() < bubble1.getY()
+ bubble1.getBubbleDiam() / 2
+ bubble.getBubbleDiam() / 2) {
if (PangUtilities.areasDistance(bubble1, bubble) < bubble1
.getBubbleDiam() / 2 + bubble.getBubbleDiam() / 2) {
calculateNewVelocities(bubble1, bubble);
}
}
}
}
}
private void calculateNewVelocities(Bubble bubble1, Bubble bubble) {
double mass1 = bubble1.getBubbleDiam()/2;
double mass2 = bubble.getBubbleDiam()/2;
double velX1 = bubble1.get_xDelta();
double velX2 = bubble.get_xDelta();
double velY1 = bubble1.get_yDelta();
double velY2 = bubble.get_yDelta();
double newVelX1 = (velX1 * (mass1 - mass2) + (2 * mass2 * velX2)) / (mass1 + mass2);
double newVelX2 = (velX2 * (mass2 - mass1) + (2 * mass1 * velX1)) / (mass1 + mass2);
double newVelY1 = (velY1 * (mass1 - mass2) + (2 * mass2 * velY2)) / (mass1 + mass2);
double newVelY2 = (velY2 * (mass2 - mass1) + (2 * mass1 * velY1)) / (mass1 + mass2);
bubble1.set_xDelta(newVelX1);
bubble.set_xDelta(newVelX2);
bubble1.set_yDelta(newVelY1);
bubble.set_yDelta(newVelY2);
bubble1.setX(bubble1.getX() + newVelX1);
bubble1.setY(bubble1.getY() + newVelY1);
bubble.setX(bubble.getX() + newVelX2);
bubble.setY(bubble.getY() + newVelY2);
}
private void bubbleWallCollision(Bubble bubble) {
if (bubble.getX() + bubble.getBubbleDiam()/2 >= w
&& bubble.get_xDelta() > 0)
bubble.invert_xDelta();
if (bubble.getX()-bubble.getBubbleDiam()/2 <= 0 && bubble.get_xDelta() < 0)
bubble.invert_xDelta();
if (bubble.getY() + bubble.getBubbleDiam()/2 >= h
&& bubble.get_yDelta() > 0)
bubble.invert_yDelta();
if (bubble.getY()-bubble.getBubbleDiam()/2 <= 0 && bubble.get_yDelta() < 0)
bubble.invert_yDelta();
}
public static void main(String[] args) {
Runnable r = new Runnable() {
@Override
public void run() {
new ShapeCollision();
}
};
SwingUtilities.invokeLater(r);
}
}Bubble.java:
package pang.gui;
import java.awt.Shape;
import java.awt.geom.Area;
import java.awt.geom.Ellipse2D;
public class Bubble {
private Area bubbleArea = new Area();
private double bubbleDiam = 20, bubbleSpeed = 2;// bubble diameter
private Shape shape;
private double x;
private double y;
private int initialDirectionX, initialDirectionY;
private double xDelta = bubbleSpeed;// bubble move increments
private double yDelta = bubbleSpeed;// bubble move increments
public Bubble(int x, int y,int i) {
this.x = x;// Bubble position
this.y = y;// Bubble position
this.bubbleDiam *=i+1;
System.out.println(bubbleDiam);
genDirection();
}
public void IncrementPos() {
x += xDelta;// new position of the bubble
y += yDelta;// new position of the bubble
this.bubbleArea = new Area(new Ellipse2D.Double(x-bubbleDiam/2, y-bubbleDiam/2, bubbleDiam,
bubbleDiam));// bubble area definition
shape=new Ellipse2D.Double(x-bubbleDiam/2, y-bubbleDiam/2, bubbleDiam,
bubbleDiam);
}
public Shape getShape() {
return shape;
}
public void setX(double d) {
this.x = d;
}
public void setY(double d) {
this.y = d;
}
public Area getBubbleArea() {
return bubbleArea;
}
public double getBubbleDiam() {
return bubbleDiam;
}
public double get_xDelta() {
return xDelta;
}
public double get_yDelta() {
return yDelta;
}
public void set_xDelta(double d) {
this.xDelta = d;
}
public void set_yDelta(double d) {
this.yDelta = d;
}
public void invert_yDelta() {
yDelta *= -1;
}
public void invert_xDelta() {
xDelta *= -1;
}
public double getX() {
return x;
}
public double getY() {
return y;
}
private void genDirection() {
do {
initialDirectionX = PangUtilities.genRandomInt(-3, 3);
} while (initialDirectionX == 0);
do {
initialDirectionY = PangUtilities.genRandomInt(-3, 3);
} while (initialDirectionX == initialDirectionY
|| initialDirectionY == 0);
xDelta *= initialDirectionX;
yDelta *= initialDirectionY;
}
}PangUtilities.java:
package pang.gui;
import java.util.Random;
public class PangUtilities {
public static int genRandomInt(int min, int max) {
Random rand = new Random();
return min + rand.nextInt((max - min) + 1);
}
public static double areasDistance(Bubble b1, Bubble b2) {
double distance = Math
.sqrt(((b1.getX() - b2.getX()) * (b1.getX() - b2.getX()))
+ ((b1.getY() - b2.getY()) * (b1.getY() - b2.getY())));
return distance;
}
}
