Java实现简易画图板

package palette; import java.awt.BasicStroke; import java.awt.Color; import java.awt.Graphics2D; import java.awt.RenderingHints; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import java.util.Random; import javax.swing.JButton; public class DrawListener extends MouseAdapter implements ActionListener{ private int x1, y1, x2, y2; private int newx1,newy1,newx2,newy2; private Graphics2D g; private DrawMain df; private boolean flag=false; String shape="直线"; Color color; private int [] arrx=new int[4]; private int [] arry=new int[4]; private int temp=0; DrawListener(DrawMain d){ df=d; } //获取形状和颜色 public void actionPerformed(ActionEvent e){ if(e.getActionCommand().equals("")){ JButton button = (JButton) e.getSource(); color = button.getBackground(); }else{ JButton button = (JButton) e.getSource(); shape = button.getActionCommand(); } } //实现画笔 public void mousePressed(MouseEvent e) { g=(Graphics2D) df.getGraphics(); g.setColor(color); x1=e.getX(); y1=e.getY(); } public void mouseReleased(MouseEvent e) { x2 = e.getX(); y2 = e.getY(); if (shape.equals("直线")) { g.drawLine(x1, y1, x2, y2); }else if(shape.equals("弧线")){ g.drawArc(x1, y1, Math.abs(x2-x1), Math.abs(y2-y1), 0, 180); }else if(shape.equals("多边形")&&!flag){ g.drawLine(x1, y1, x2, y2); newx1=x1; newy1=y1; newx2=x2; newy2=y2; flag=true; }else if(shape.equals("圆")){ g.drawOval(x1, y1, Math.abs(x2-x1), Math.abs(y2-y1)); }else if(shape.equals("矩形")){ g.drawRect(x1, y1, Math.abs(x2-x1), Math.abs(y2-y1)); }else if(shape.equals("圆角矩形")){ g.drawRoundRect(x1, y1, Math.abs(x2-x1), Math.abs(y2-y1),2,10); }else if(shape.equals("椭圆")){ g.drawOval(x1, y1, Math.abs(x2-x1), Math.abs(y2-y1)); } } public void mouseClicked(MouseEvent e) { if(shape.equals("多边形")&&flag){ x2=e.getX(); y2=e.getY(); if(e.getClickCount()==2){ g.drawLine(newx1, newy1, newx2, newy2); flag=false; } g.drawLine(newx2, newy2, x2, y2); newx2=x2; newy2=y2; }else if(shape.equals("图形")){ arrx[temp]=e.getX(); arry[temp]=e.getY(); temp++; if(temp==4){ int x=arrx[3]; int y=arry[3]; for(int i=0;i<=10000;i++){ Random ran=new Random(); int k=ran.nextInt(3); x=(x+arrx[k])/2; y=(y+arry[k])/2; g.drawLine(x, y, x, y); } temp=0; } }else if(shape.equals("立体圆")){ double a=1.40,b=1.56,c=1.40,d=-6.56; double x = 0,xo=0; double y = 0,yo=0; Color [] Col={Color.BLUE,Color.cyan,Color.green,Color.magenta,Color.red,Color.yellow}; for(int i=0;i<=90000;i++){ Random r=new Random(); //增加颜色 int R=r.nextInt(Col.length); g.setColor(Col[R]); x=d*Math.sin(a*xo)-Math.sin(b*yo); y=c*Math.cos(a*xo)+Math.cos(b*yo); int temp_x=(int)(x*50); int temp_y=(int)(y*50); g.drawLine(temp_x+500, temp_y+300, temp_x+500, temp_y+300); xo=x; yo=y; } }else if(shape.equals("三角形")){ double a=-2,b=-2,c=-1.2,d=2; double x = 0,xo=0; double y = 0,yo=0; Color [] Col={Color.BLUE,Color.cyan,Color.green,Color.magenta,Color.red,Color.yellow}; for(int i=0;i<=90000;i++){ Random r=new Random(); //增加颜色 int R=r.nextInt(Col.length); g.setColor(Col[R]); x=Math.sin(a*yo)-Math.cos(b*xo); y=Math.sin(c*xo)-Math.cos(d*yo); int temp_x=(int)(x*50); int temp_y=(int)(y*50); g.drawLine(temp_x+500, temp_y+300, temp_x+500, temp_y+300); xo=x; yo=y; } } } public void mouseDragged(MouseEvent e) { x2 = e.getX(); y2 = e.getY(); if (shape.equals("曲线")) { g.drawLine(x1, y1, x2, y2); x1 = x2; y1 = y2; }else if(shape.equals("橡皮擦")){ g.setStroke(new BasicStroke(80)); g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); g.setColor(Color.WHITE); g.drawLine(x1, y1, x2, y2); x1 = x2; y1 = y2; }else if(shape.equals("喷枪")){ for(int k=0;k<20;k++){ Random i=new Random(); int a=i.nextInt(8); int b=i.nextInt(10); g.drawLine(x2+a, y2+b, x2+a, y2+b); } } } }