我正在模拟sierpinski三角形的混沌游戏。
我试图画一个新点，而不是清除最后一个点。随着GUI上的点数增加以创建sierpinski三角形图像，绘制点的速度由于for循环而减小。我想在没有for循环的情况下运行这个程序，但每次重绘时，前一点都会清除。
截至目前，我已经制作了这个程序的工作版本，但我希望它更高效。
这是我整个计划的代码。
import javax.swing.*; //JFrame and JPanel
import java.awt.*; //Color and Container
import javax.swing.JOptionPane;
import java.awt.event.*;
import java.util.Scanner;
import java.io.*;
import java.util.Random;
import java.util.ArrayList;
import java.util.List;
/**
* Write a description of class ChaosGame here.
*
* @author (your name)
* @version (a version number or a date)
*/
public class ChaosGame
{
public static void main(String[] args) {
JFrame theGUI = new JFrame("Chaos Game");
theGUI.setSize(800, 800);
theGUI.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
ColorPanel panel = new ColorPanel(Color.white);
Container pane = theGUI.getContentPane();
pane.add(panel);
theGUI.setVisible(true);
}
}
class ColorPanel extends JPanel implements MouseMotionListener, MouseListener{
private Random random = new Random();
private Seed s;
private Red r;
private Blue b;
private Green gr;
private boolean followMouse = true;
javax.swing.Timer timer;
javax.swing.Timer arraytimer;
private int x, y;
private int newx, newy;
private int redx = 100;
private int redy = 660;
private int bluex = 700;
private int bluey = 660;
private int greenx = 400;
private int greeny = 140;
private int pointx, pointy;
private int seedx, seedy;
private int i;
private int dotcounter;
private Point[] p = new Point[10000];
public ColorPanel(Color backcolor){
setBackground(backcolor);
s = new Seed(400, 400, Color.YELLOW);
r = new Red(100, 660, Color.RED);
b = new Blue(700, 660, Color.BLUE);
gr = new Green(400, 140, Color.GREEN);
i = 0;
dotcounter = 0;
addMouseListener(this);
addMouseMotionListener(this);
this.setFocusable(true);
timer = new javax.swing.Timer(1, new MoveListener());
arraytimer = new javax.swing.Timer(1, new ArrayTimer());
}
public void paintComponent(Graphics g){
//tells ball what to do when it hits the sides
super.paintComponent(g);
r.fill(g);
b.fill(g);
gr.fill(g);
s.fill(g);
Font font = new Font("Courier", Font.PLAIN, 30);
g.setFont(font);
if (followMouse == true){
timer.start();
s.moveto(x, y);
g.drawString("Seed" ,x + 10, y - 10);
}
else if (followMouse == false){
timer.stop();
arraytimer.start();
s.moveto(seedx, seedy);
int n = random.nextInt(3) + 1;
newx = pointx;
newy = pointy;
//1 = red
//2 = green
//3 = blue
if(dotcounter <= 14){
if (n == 1){
pointx = (newx + redx) / 2;
pointy = (newy + redy) / 2;
p[dotcounter] = new Point(pointx, pointy, Color.WHITE);
}
else if (n == 2){
pointx = (newx + greenx) / 2;
pointy = (newy + greeny) / 2;
p[dotcounter] = new Point(pointx, pointy, Color.WHITE);
}
else if (n == 3){
pointx = (newx + bluex) / 2;
pointy = (newy + bluey) / 2;
p[dotcounter] = new Point(pointx, pointy, Color.WHITE);
}
}
else if (dotcounter >= 15 && dotcounter < 10000){
if (n == 1){
pointx = (newx + redx) / 2;
pointy = (newy + redy) / 2;
p[dotcounter] = new Point(pointx, pointy, Color.RED);
}
else if (n == 2){
pointx = (newx + greenx) / 2;
pointy = (newy + greeny) / 2;
p[dotcounter] = new Point(pointx, pointy, Color.GREEN);
}
else if (n == 3){
pointx = (newx + bluex) / 2;
pointy = (newy + bluey) / 2;
p[dotcounter] = new Point(pointx, pointy, Color.BLUE);
}
}
else{
arraytimer.stop();
}
for (i = 0; i < dotcounter; i++)
{
p[i].fill(g);
}
}
g.drawString(""+dotcounter, 600, 60);
}
@Override
public void mouseDragged(MouseEvent e) {
// TODO Auto-generated method stub
}
@Override
public void mouseMoved(MouseEvent e) {
x = e.getX();
y = e.getY();
}
@Override
public void mouseClicked(MouseEvent e) {
// TODO Auto-generated method stub
}
@Override
public void mouseEntered(MouseEvent e) {
// TODO Auto-generated method stub
}
@Override
public void mouseExited(MouseEvent e) {
// TODO Auto-generated method stub
}
@Override
public void mousePressed(MouseEvent e){
if (followMouse == true){
seedx = x;
seedy = y;
pointx = seedx;
pointy = seedy;
followMouse = false;
}
else{}
}
@Override
public void mouseReleased(MouseEvent e) {
// TODO Auto-generated method stub
}
private class MoveListener implements ActionListener{
public void actionPerformed(ActionEvent e){
repaint();
}
}
private class ArrayTimer implements ActionListener{
public void actionPerformed(ActionEvent e){
dotcounter++;
repaint();
}
}
}
class Seed{
private int centerX, centerY, radius;
private Color color;
public Seed(int x, int y, Color thecolor){
centerX = x;
centerY = y;
radius = 4;
color = thecolor;
}
public void fill(Graphics g){
//fills circle
Color oldColor = g.getColor();
g.setColor(color);
g.fillOval(centerX-radius, centerY-radius, radius*2, radius*2);
g.setColor(oldColor);
}
public void moveto(int xAmount, int yAmount){
//Moves ball
centerX = xAmount;
centerY = yAmount;
}
}
class Red{
private int centerX, centerY, radius;
private Color color;
public Red(int x, int y, Color thecolor){
centerX = x;
centerY = y;
radius = 4;
color = thecolor;
}
public void fill(Graphics g){
//fills circle
Color oldColor = g.getColor();
g.setColor(color);
g.fillOval(centerX-radius, centerY-radius, radius*2, radius*2);
g.setColor(oldColor);
}
public void moveto(int xAmount, int yAmount){
//Moves ball
centerX = xAmount;
centerY = yAmount;
}
}
class Blue{
private int centerX, centerY, radius;
private Color color;
public Blue(int x, int y, Color thecolor){
centerX = x;
centerY = y;
radius = 4;
color = thecolor;
}
public void fill(Graphics g){
//fills circle
Color oldColor = g.getColor();
g.setColor(color);
g.fillOval(centerX-radius, centerY-radius, radius*2, radius*2);
g.setColor(oldColor);
}
public void moveto(int xAmount, int yAmount){
//Moves ball
centerX = xAmount;
centerY = yAmount;
}
}
class Green{
private int centerX, centerY, radius;
private Color color;
public Green(int x, int y, Color thecolor){
centerX = x;
centerY = y;
radius = 4;
color = thecolor;
}
public void fill(Graphics g){
//fills circle
Color oldColor = g.getColor();
g.setColor(color);
g.fillOval(centerX-radius, centerY-radius, radius*2, radius*2);
g.setColor(oldColor);
}
public void moveto(int xAmount, int yAmount){
//Moves ball
centerX = xAmount;
centerY = yAmount;
}
}
class Point{
private int centerX, centerY, radius;
private Color color;
public Point(int x, int y, Color thecolor){
centerX = x;
centerY = y;
radius = 1;
color = thecolor;
}
public void fill(Graphics g){
//fills circle
Color oldColor = g.getColor();
g.setColor(color);
g.fillRect(centerX-radius, centerY-radius, radius, radius);
g.setColor(oldColor);
}
public void moveto(int xAmount, int yAmount){
//Moves ball
centerX = xAmount;
centerY = yAmount;
}
}
答案 0 :(得分：1)
请查看Custom Painting Approaches以了解执行此操作的两种常用方法：
听起来第二种方法就是你在第一种方法遇到性能问题时所需的方法。