本作者在构造射线的重绘时出现了错误，将会在以后的文章中贴出来。。。

画板的重绘

      当窗体的状态发生改变时，画板上的缓存会自动清空。屏幕上绘制的图像是将窗体中的对象数据从内存中取出来放到缓存中，再绘制的。故因此需要找一个东西来存这些图形的数据。

步骤

一，创建一个图形类，构造绘制图形的属性和绘图的方法。

package com.xx.h;import java.awt.Color;
import java.awt.Graphics;
import java.util.Random;public class Shap {String type;int x1, y1, x2, y2, x3, x4, x5, y3, y4, y5, x6, y6, x7, y7;int x0, y0, dx, dy, x1f, y1f, x2f, y2f, x1d, x2d, y1d, y2d, x3d, y3d, n;Color color;public void drawShape(Graphics gp) {gp.setColor(color);if (type.equals("╲")) {gp.drawLine(x1, y1, x2, y2);} else if (type.equals("□")) {gp.drawRect(Math.min(x1, x2), Math.min(y1, y2), Math.abs(x2 - x1), Math.abs(y2 - y1));System.out.println("鼠标释放");} else if (type.equals("○")) {gp.drawOval(Math.min(x1, x2), Math.min(y1, y2), Math.abs(x2 - x1), Math.abs(y2 - y1));} else if (type.equals("△")) {gp.drawLine(x3, y3, x4, y4);gp.drawLine(x5, y5, x4, y4);gp.drawLine(x3, y3, x5, y5);} else if (type.equals("谢尔彬三角形")) {drawsjx(8, 500, 500, 400, 400, gp);}else if(type.equals("地毯")){drawdt(6, 300, 300, 550, gp);}else if (type.equals("蕨类")) {drawjue(gp);} else if (type.equals("画笔")) {gp.drawLine(x1, y1, x6, y6);} else if (type.equals("射线")) {gp.drawLine(x1, y1, x6, y6);}else if(type.equals("枫叶")){drawfy(gp);}}private void drawfy(Graphics g) {double xn1 = 0f, yn1 = 0f;// double a[]=;直接定义// int i[]=new int[10]; 先定义大小再根据for循环（要创建一个方法）double a[] = { 0.1400, 0.4300, 0.4500, 0.4900 };double b[] = { 0.0100, 0.5200, -0.4900, 0.0000 };double c[] = { 0.0000, -0.4500, 0.4700, 0.0000 };double d[] = { 0.5100, 0.5000, 0.4700, 0.5100 };double e[] = { -0.0800, 1.4900, -1.6200, 0.0200 };double f[] = { -1.3100, -0.7500, -0.7400, 1.6200 };Random rr = new Random(4);for (int i = 1; i < 22500; i++) {int tt = rr.nextInt(4);double xn11 = (a[tt] * xn1 + b[tt] * yn1 + e[tt]);double yn11 = (c[tt] * xn1 + d[tt] * yn1 + f[tt]);System.out.println(xn11 + "    " + yn11);int x1 = (int) (xn11 * 130 + 700);int y1 = (int) (yn11 * 130 + 600);g.setColor(new Color(198, 60, 60));g.drawLine(x1, y1, x1, y1);System.out.println(x1 + "    " + y1);xn1 = xn11;yn1 = yn11;}}public void drawdt(int n, int x0f, int y0f, int dx,Graphics g) {if (n == 0)return;
//      try {//          Thread.sleep(10);
//      } catch (InterruptedException e) {//          // TODO Auto-generated catch block
//          e.printStackTrace();
//      }Random ra = new Random();ra.nextInt(255);g.setColor(new Color(ra.nextInt(255), ra.nextInt(255), ra.nextInt(255)));g.drawRect(x0f, y0f, dx, dx);int x0d = x0f + (dx / 3);int y0d = y0f + (dx / 3);g.drawRect(x0d, y0d, dx / 3, dx / 3);drawdt(n - 1, x0f, y0f, dx / 3,g);drawdt(n - 1, x0d, y0f, dx / 3,g);drawdt(n - 1, x0d + dx / 3, y0f, dx / 3,g);drawdt(n - 1, x0f, y0f + dx / 3, dx / 3,g);drawdt(n - 1, x0d + dx / 3, y0f + (dx) / 3, dx / 3,g);drawdt(n - 1, x0f, y0d + (dx) / 3, dx / 3,g);drawdt(n - 1, x0d, y0d + (dx) / 3, dx / 3,g);drawdt(n - 1, x0d + dx / 3, y0d + (dx) / 3, dx / 3,g);}public void drawsjx(int n, int x0, int y0, int dx, int dy, Graphics g) {System.out.println("三角形");if (n == 0)return;// ra.nextInt(255);System.out.println("DRAWXRB1");int x1f = x0 + dx;int x2f = x0 - dx;int y1f = y0 + dy;int y2f = y0 + dy;g.drawLine(x0, y0, x1f, y1f);g.drawLine(x0, y0, x2f, y2f);g.drawLine(x2f, y2f, x1f, y1f);int x1d = (x0 + x1f) / 2;int y1d = (y0 + y1f) / 2;int x2d = (x0 + x2f) / 2;int y2d = (y0 + y2f) / 2;int x3d = (x1f + x2f) / 2;int y3d = y2f;g.drawLine(x1d, y1d, x2d, y2d);g.drawLine(x1d, y2d, x3d, y3d);g.drawLine(x2d, y2d, x3d, y3d);drawsjx(n - 1, x1d, y1d, dx / 2, dy / 2, g);drawsjx(n - 1, x2d, y2d, dx / 2, dy / 2, g);drawsjx(n - 1, x0, y0, dx / 2, dy / 2, g);}public void drawjue(Graphics g) {double xn1 = 0, yn1 = 0;double a[] = { 0.0, 0.2, -0.15, 0.85 };double b[] = { 0.0, -0.26, 0.28, 0.04 };double c[] = { 0.0, 0.23, 0.26, -0.04 };double d[] = { 0.16, 0.22, 0.24, 0.85 };double e[] = { 0.0, 0.0, 0.0, 0.0 };double f[] = { 0.0, 1.6, 0.44, 1.6 };// 定义一个随机类Random rr = new Random();// 递归调用225000次for (int i = 1; i < 22500; i++) {// 可以轮流得到七个数int tt = rr.nextInt(100);int m = 0;if (tt < 2) {m = 1;} else if (tt > 1 && tt < 9) {m = 2;} else if (tt > 8 && tt < 15) {m = 3;} else if (tt > 14 && tt < 101) {m = 3;}double xn11 = a[m] * xn1 + b[m] * yn1 + e[m];double yn11 = c[m] * xn1 + d[m] * yn1 + f[m];System.out.println(xn11 + "    " + yn11);int x1 = (int) (xn11 * 50 + 300);int y1 = (int) (yn11 * 50 + 400);g.drawLine(x1, y1, x1, y1);System.out.println(x1 + "    " + y1);// 递归调用xn1 = xn11;yn1 = yn11;}}
}

二，构造主面板的类

在构造主面板的类上构造一个图形类的数组，并定义好大小。
注意直接继承JFrame的类

public class Rejframe extends JFrame {Shap s[] = new Shap[100000];

重写Jframe 的paint方法（在paint方法中引入数组对象）

 public void paint(Graphics g) {super.paint(g);for (int i = 0; i < s.length; i++) {if (s[i] != null) {s[i].drawShape(g);}}}
}

或者构造一个新的类来重写paint的方法

public class Njframe extends JFrame{Shape[] shapestr;public Njframe(Shape[] shapestr2) {this.shapestr=shapestr2;}public void paint(Graphics g){super.paint(g);for (int i = 0; i < shapestr.length; i++) {Shape s =shapestr[i];if(s!=null){s.drawShape(g);}}}
}

但是注意应该把构造画板的类上将
JFrame jf =new JFrame（）；
改成
Njframe jf = new Njframe（）;

二，在监听器里的实例化图形类的对象，并将对象传入到数组上

public class Dlistener implements MouseListener, ActionListener, MouseMotionListener {int x1, y1, x2, y2, x3, x4, x5, y3, y4, y5, x6, y6, x7, y7;int x8, y8;JFrame jf;String Bt = "";Color c;JButton btn;int count = 0;int count1 = 0;int intcount = 0;Graphics g;Shap[] h;JColorChooser jc = new JColorChooser();// 构造方法public Dlistener(Shap[] s) {this.h = s;}@Overridepublic void mouseDragged(MouseEvent e) {if (Bt.equals("画笔")) {x6 = e.getX();y6 = e.getY();Shap s = new Shap();s.type = Bt;s.x1 = x1;s.y1 = y1;s.x6 = x6;s.y6 = y6;s.drawShape(g);h[count] = s;count++;x1 = x6;y1 = y6;}if (Bt.equals("射线")) {x6 = e.getX();y6 = e.getY();if (count1 == 0) {g.drawLine(x1, y1, x6, y6);x7 = x6;y7 = y6;// 此时若不传值，则为一根白一根黑count1++;} else if (count1 == 1) {g.setColor(Color.white);g.drawLine(x1, y1, x7, y7);g.setColor(Color.black);count1 = 0;}}if (Bt.equals("射线")) {x6 = e.getX();y6 = e.getY();Shap s = new Shap();s.x1 = x1;s.y1 = y1;s.x6 = x6;s.y6 = y6;s.type = Bt;s.color = c;s.drawShape(g);h[count] = s;count++;}}@Overridepublic void mouseMoved(MouseEvent e) {}@Overridepublic void actionPerformed(ActionEvent e) {Bt = e.getActionCommand();System.out.println(Bt);if (Bt.equals("")) { // 得到按钮对象（可以得到颜色等属性）；通过e的点击可以得到按钮的属性。btn = (JButton) e.getSource();// 如果通过传值的话。。。。是得不到的// 得到按钮的颜色c = btn.getBackground();// 将颜色设置给画笔（画布）g.setColor(c);}if (Bt.equals("Color")) {btn = (JButton) e.getSource();c = JColorChooser.showDialog(jc, null, Color.WHITE);g.setColor(c);btn.setBackground(c);}Shap s = new Shap();s.type = Bt;s.color = c;s.drawShape(g);h[count] = s;count++;//// else if (Bt.equals("地毯")) {// // drawdt(6, 300, 300, 550);// }//// if (Bt.equals("gaga1")) {// // drawjaja1();// }// if (Bt.equals("自定义")) {// // drawjaja2(22, 22);// }// if (Bt.equals("枫叶")) {// // drawjaja3(0, 0);// }// if (Bt.equals("梅花")) {// // drawjava4();// }// if (Bt.equals("ga")) {// // drawjava5();// }// if (Bt.equals("3D")) {// // drawjava6();// }// if (Bt.equals("蕨类")) {// Shap s = new Shap();// s.type = Bt;// s.color = c;// s.drawShape(g);// h[count] = s;// count++;//// }}public void mouseClicked(MouseEvent e) {// if(e.getClickCount()==1){if (Bt.equals("△")) {Shap s = new Shap();if (intcount == 0) {x3 = e.getX();y3 = e.getY();intcount++;}else if (intcount == 1) {x4 = e.getX();y4 = e.getY();intcount++;}else if (intcount == 2) {x5 = e.getX();y5 = e.getY();s.type = Bt;s.x3 = x3;s.y3 = y3;s.x4 = x4;s.y4 = y4;s.x5 = x5;s.y5 = y5;h[count] = s;s.drawShape(g);count++;intcount = 0;}}}@Overridepublic void mousePressed(MouseEvent e) {System.out.println("鼠标按下");x1 = e.getX();y1 = e.getY();}@Overridepublic void mouseReleased(MouseEvent e) {x2 = e.getX();y2 = e.getY();// 注意s实例化的位置if (Bt.equals("╲")) {Shap s = new Shap();s.color = c;s.type = Bt;s.x1 = x1;s.x2 = x2;s.y1 = y1;s.y2 = y2;s.drawShape(g);h[count] = s;count++;}if (Bt.equals("□")) {Shap s = new Shap();s.color = c;s.type = Bt;s.x1 = x1;s.x2 = x2;s.y1 = y1;s.y2 = y2;s.drawShape(g);h[count] = s;count++;}if (Bt.equals("○")) {Shap s = new Shap();s.color = c;s.type = Bt;s.x1 = x1;s.x2 = x2;s.y1 = y1;s.y2 = y2;s.drawShape(g);h[count] = s;count++;}}@Overridepublic void mouseEntered(MouseEvent e) {// TODO Auto-generated method stub}@Overridepublic void mouseExited(MouseEvent e) {// TODO Auto-generated method stub}}

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Java小白画图板的重绘包括谢尔宾斯基三角形和蕨类图像的重绘

本作者在构造射线的重绘时出现了错误，将会在以后的文章中贴出来。。。

画板的重绘

步骤

一，创建一个图形类，构造绘制图形的属性和绘图的方法。

二，构造主面板的类

二，在监听器里的实例化图形类的对象，并将对象传入到数组上

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