谢尔宾斯基三角形(加入拉杆控制递归)
package 三角形;import java.awt.Dimension;import java.awt.FlowLayout;import java.awt.Graphics;import java.awt.event.MouseAdapter;import java.awt.event.MouseEvent;import javax.swing.JFrame;import javax.swing.JPanel;import javax.swing.JSlider;import javax.swing.event.ChangeEvent;import javax.swing.event.ChangeListener;//实现谢尔宾斯基三角形public class sanjiaoxing extends JFrame{final JSlider js=new JSlider(1,10,1);//外部定义栏杆参数int x1,x2,y1,y2,x3,y3,count;int width=600,height=400;Graphics g;JPanel jp;Dimension di;public void showUI(){this.setSize(width,height);this.setTitle("三角形");this.setVisible(true);//创建流式布局FlowLayout fl = new FlowLayout();this.setLayout(fl);//增加一个拉杆控制count = js.getValue();this.add(js);js.addChangeListener(new ChangeListener() {@Overridepublic void stateChanged(ChangeEvent b) {// TODO Auto-generated method stub//count = js.getValue();}});this.setDefaultCloseOperation(3);g=this.getGraphics();//加上自定义的鼠标事件监听器：鼠标释放时调用方法this.addMouseListener(new MouseAdapter() {//只需要重写需要的方法即可，因为父类不是接口：//鼠标按下时的点的坐标public void mouseReleased(MouseEvent e) {draw(e);}});}//设置基本参数public void draw(MouseEvent e) {x1=width/4;y1=height*4/5;x2=width*3/4;y2=height*4/5; g.setColor(java.awt.Color.BLUE);draw_digui(x1,y1,x2,y2,js.getValue());}public void draw_digui(int x1,int y1,int x2,int y2,int count){if(count>0){x3=(int)Math.abs(x2+x1)/2;y3=(int) Math.abs(y2-Math.sqrt(3)*Math.abs(x2-x1)/2);g.drawLine(x1,y1,x2,y2);g.drawLine(x1,y1,x3,y3);g.drawLine(x2,y2,x3,y3);count--;int x11=(x1+x2)/2;int y11=(y1+y2)/2;int x22=(x2+x3)/2;int y22=(y2+y3)/2;int x33=(x1+x3)/2;int y33=(y1+y3)/2;g.drawLine(x11,y11,x22,y22);g.drawLine(x11,y11,x33,y33);g.drawLine(x22,y22,x33,y33);draw_digui(x1,y1,x11,y11,count);draw_digui(x11,y11,x2,y2,count);draw_digui(x33,y33,x22,y22,count);}count--;}//主函数入口public static void main (String []args){sanjiaoxing san = new sanjiaoxing();san.showUI();}}?