Determining if my mouse is on a shape or not.
Greetings All,
I am writing a program where I am rendering varying geometric shapes on a jpanel. I want to be able to mouse over each shape, and keep track of whether I am on any particular shape so I can do something with the shape.
I have started going down the path of having a class that stores the actual pixels the shape encompasses. I suppose that will work, and am not ready to throw that approach away (although it seems a bit primitive), but before I reinvented the wheel, I was wondering if there might already be some code snippets demonstrating a strategy, not necessarily mine, that works (I would assume so). I have been unable to find anything on the web yet.
Can anyone help?
Thanks,
Richard
# 2
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.util.ArrayList;
public class RolloverTest{
public static void main(String[] args){
new RolloverTest();
}
public RolloverTest(){
shapes = new ArrayList(5);
Rectangle rect1 = new Rectangle(10, 10, 40, 40);
shapes.add(new HotShape(rect1, mouseOff));
Rectangle rect2 = new Rectangle(40, 70, 40, 40);
shapes.add(new HotShape(rect2, mouseOff));
Line2D line1 = new Line2D.Double(100, 100, 200, 200);
shapes.add(new HotShape(line1, mouseOff));
Line2D line2 = new Line2D.Double(10, 300, 300, 10);
shapes.add(new HotShape(line2, mouseOff));
Ellipse2D oval1 = new Ellipse2D.Double(300, 100, 60, 60);
shapes.add(new HotShape(oval1, mouseOff));
hotPiece = (HotShape)shapes.get(0);
drawingBoard = new DrawingBoard(this);
frame = new JFrame("Rollover Test");
frame.setContentPane(drawingBoard);
frame.setSize(500, 500);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
public class DrawingBoard extends JPanel implements MouseMotionListener{
public DrawingBoard(RolloverTest rt){
this.rt = rt;
this.setBackground(Color.WHITE);
this.addMouseMotionListener(this);
}
public void paintComponent(Graphics g){
super.paintComponent(g);
Graphics2D gfx = (Graphics2D)g;
gfx.setStroke(new BasicStroke(5));
for(int i = 0; i < rt.shapes.size(); i++){
HotShape shape = (HotShape)rt.shapes.get(i);
gfx.setColor(shape.color);
gfx.draw(shape.shape);
}
}
public void mouseDragged(MouseEvent evt){}
public void mouseMoved(MouseEvent evt){
Rectangle rect = new Rectangle(evt.getX(), evt.getY(), 1, 1);
for(int i = 0; i < rt.shapes.size(); i++){
HotShape shape = (HotShape)rt.shapes.get(i);
if(//shape.shape.contains((double)evt.getX(), (double)evt.getY())){
shape.shape.intersects(rect)){
rt.hotPiece.color = rt.mouseOff;
rt.hotPiece = shape;
shape.color = rt.mouseOn;
this.repaint();
}
}
}
RolloverTest rt;
}
public class HotShape{
public HotShape(Shape shape, Color color){
this.shape = shape;
this.color = color;
}
Shape shape;
Color color;
}
JFrame frame;
DrawingBoard drawingBoard;
ArrayList shapes;
HotShape hotPiece;
Color mouseOff = Color.BLUE;
Color mouseOn = Color.RED;
}
