JavaAWT绘图实例
窗体：
```
import java.awt.Color;
import java.awt.Frame;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
public class AWTDrawTest extends WindowAdapter{
//构造方法
public AWTDrawTest(){
Frame f = new Frame("绘图测试");
DrawCanvas dc = new DrawCanvas();//实例化画布
f.add(dc);
f.addWindowListener(this);//添加关闭事件
f.setBackground(new Color(160,220,220));//设置背景颜色
f.setLocationByPlatform(true);
f.setSize(600,400);
f.setVisible(true);
}
@Override//重写方法
public void windowClosing(WindowEvent e){
System.exit(0);
}
//main方法
public static void main(String[] args){
new AWTDrawTest();
}
}
```
画布：
```
import java.awt.Canvas;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
class DrawCanvas extends Canvas{ //新建画布类
@Override//重写方法
public void paint(Graphics g){
Graphics2D g2 = (Graphics2D) g;
g.setFont(new Font("楷体",Font.PLAIN,50));//设置字体
g.setColor(Color.RED);//设置颜色
g.drawString("AWT绘图演示",60,60);//画出字符串
g.drawLine(50,80,500,80);//画出一条直线
g.setColor(Color.BLUE);//设置颜色
g.drawRect(50,90,200,80);//画空心矩形
g.fillRect(300,90,200,80);
g.fillArc(50,200,65,65,0,90);//画扇形
g.setFont(new Font("华文彩云",Font.PLAIN,64));//设置字体
g.setColor(new Color(8, 46, 84));//设置颜色
g.drawString("编程百科",90,300);//画出字符串
}
}
```
获取窗体边框的大小：
```
Insets set=frame.getInsets();
int top = set.top; //上边框厚度
int left = set.left; //左边框厚度
int right = set.right; //右边框厚度
int bottom = set.bottom; //底边框厚度
```
重写update，双缓冲技术解决重绘闪烁：
```
Image ImageBuffer = null;
Graphics GraImage = null;
public void update(Graphics g){ //覆盖update方法，截取默认的调用过程
ImageBuffer = createImage(this.getWidth(), this.getHeight()); //创建图形缓冲区
GraImage = ImageBuffer.getGraphics(); //获取图形缓冲区的图形上下文
paint(GraImage); //用paint方法中编写的绘图过程对图形缓冲区绘图
GraImage.dispose(); //释放图形上下文资源
g.drawImage(ImageBuffer, 0, 0, this); //将图形缓冲区绘制到屏幕上
}
```