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| <PRE>
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| import java.awt.*;
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| import java.awt.event.*;
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| import javax.swing.*;
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| import java.util.*;
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|
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| public class PaintPanel extends JPanel
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| implements MouseMotionListener {
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|
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| /* static class variables to determine shapes */
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| public static int LINE = 0;
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| public static int RECTANGLE = 1;
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| public static int OVAL = 2;
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|
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| private boolean filledShape = true;
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| private int shape = 1; // default is rectangle
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| private int startX;
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| private int startY;
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| private int stopX;
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| private int stopY;
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| private Color paintColor;
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| private boolean mousePressed;
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| private PaintShape tempShape;
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| private Vector storedShapes;
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|
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| public PaintPanel() {
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| super(true); // being double buffered
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|
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| paintColor = Color.black;
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| storedShapes = new Vector();
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|
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| addMouseListener(new MouseAdapter() {
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| public void mousePressed(MouseEvent mp) {
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| if ((mp.getModifiers()
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| & InputEvent.BUTTON1_MASK) != 0) {
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|
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| startX = mp.getX();
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| startY = mp.getY();
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| mousePressed = true;
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| }
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| }
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|
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| public void mouseReleased(MouseEvent mr) {
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| if ((mr.getModifiers()
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| & InputEvent.BUTTON1_MASK) != 0) {
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|
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| mousePressed = false;
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| stopX = mr.getX();
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| stopY = mr.getY();
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| tempShape = new PaintShape(filledShape,
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| paintColor, shape, startX, startY);
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| tempShape.setStop(stopX, stopY);
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| storedShapes.addElement(tempShape);
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| repaint();
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| }
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| }
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|
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| public void mouseClicked(MouseEvent mc) {
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| if (mc.getClickCount() > 1 && (mc.getModifiers()
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| & InputEvent.BUTTON3_MASK) != 0) {
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|
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| Point p = new Point(mc.getX(), mc.getY());
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| removeShape(p);
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| }
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| }
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| });
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| addMouseMotionListener(this);
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| }
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|
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| private void removeShape(Point xy) {
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| for (int i = 0; i < storedShapes.size(); i++) {
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| PaintShape tempS = (PaintShape)
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| storedShapes.elementAt(i);
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| if (tempS.contains(xy)) {
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| storedShapes.removeElement(tempS);
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| repaint();
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| break;
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| }
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| }
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| }
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|
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| public void mouseMoved(MouseEvent skipIt) { /* empty */ }
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|
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| public void mouseDragged(MouseEvent me) {
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| stopX = me.getX();
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| stopY = me.getY();
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| repaint();
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| }
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|
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| public void paintComponent(Graphics g) {
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| super.paintComponent(g);
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| for(int i = 0; i < storedShapes.size(); i++) {
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| PaintShape tempObj = (PaintShape)storedShapes.elementAt(i);
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| tempObj.paintComponent(g);
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| }
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| Color oldColor = g.getColor();
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| g.setColor(paintColor);
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|
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| if (shape == 0) { // that is line
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| g.drawLine(startX, startY, stopX, stopY);
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| } else {
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| /* make four temp variables to avoid trouble */
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| int startXX = startX;
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| int startYY = startY;
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| int width = stopX - startX;
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| int height = stopY - startY;
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| if (width < 0) { // not good
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| startXX = stopX;
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| width = -width;
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| } else {
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| startXX = startX;
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| }
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| if (height < 0) { // not good
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| startYY = stopY;
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| height = -height;
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| } else {
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| startYY = startY;
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| }
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|
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| if (shape == 1) { // that is rectangle
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| if (filledShape) {
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| g.fillRect(startXX, startYY, width, height);
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| } else {
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| g.drawRect(startXX, startYY, width, height);
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| }
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| } else { // remaining is oval
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| if (mousePressed) {
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| g.drawRect(startXX, startYY, width, height);
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| }
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| if (filledShape) {
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| g.fillOval(startXX, startYY, width, height);
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| } else {
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| g.drawOval(startXX, startYY, width, height);
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| }
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| }
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| }
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| g.setColor(oldColor);
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| }
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|
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| public void setFilled(boolean b) {
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| filledShape = b;
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| }
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|
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| public void setShape(int sh) {
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| shape = sh;
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| }
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|
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| public void setColor(Color c) {
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| paintColor = c;
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| }
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| }
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| </PRE>
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| [[Category:Into Java]]
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