java Canvas画图学习小结_java canvas.getrgb(x,y)

主函数

  package paint;
    
    import javax.swing.JFrame;
    
    public class PaintMain {
    	JFrame jFrame;
    	public static void main(String[] args) {
    		// TODO 自动生成的方法存根
    		PaintMain paintMain=new PaintMain();
    		paintMain.initView();
    	}
    
    	public void initView()
    	{
    		jFrame =new JFrame();
    		jFrame.setBounds(500, 500, 500, 500);
    		jFrame.setLayout(null);
    	
    		MyCanvas myCanvas=new MyCanvas();//画布
    		myCanvas.setBounds(0,0, 500, 500);
    		jFrame.add(myCanvas);
    		jFrame.setVisible(true);
    	}
    }
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画图子类

package paint;

import java.awt.Canvas;
import java.awt.Graphics;

public class MyCanvas extends Canvas{
	@Override
	public void paint(Graphics g) {
		// TODO 自动生成的方法存根
		super.paint(g);//直接输入paint提示出来函数；
		g.drawRect(0, 0, 50 ,50);//矩形 rectangle 
		g.fillRect(0, 50, 50, 50);
		g.drawOval(50, 0, 50, 50);//圆，oval 与椭圆一致，不过圆的宽高一致，特殊椭圆  oval
		g.fillOval(50, 50, 50, 50);//填充，后面为度数
		g.drawRoundRect(100, 0, 50, 50, 10, 10);//圆角矩形 round(V A P 圆形，整数，环绕) rect
		g.fillRoundRect(100, 50, 50, 50, 10, 10);
		int X[]= {150,175,200};
		int Y[]= {50,0,50};
		int X1[]= {150,175,200};
		int Y1[]= {100,50,100};
		g.drawPolygon(X,Y, 3);// 任意多边形  polygon(多边形)   点点相连，三个变量，前两个为数组变量，分别是点的x坐标数组，y的坐标数组，最后一个为点的个数；
		g.fillPolygon(X1, Y1, 3);
		g.drawOval(200, 0, 100, 50);//椭圆
		g.fillOval(200, 50, 100, 50);
		int X2[]= {300,325,375,350};
		int Y2[]= {0,50,50,0};
		int Y3[]= {50,100,100,50};
		g.drawPolygon(X2, Y2, 4);//平行四边形， 注意drawPolygon在使用时，是按顺序连接点的
		g.fillPolygon(X2, Y3, 4);
		g.drawArc(400, 0, 50, 50, 0, 180);//扇形
		g.fillArc(400, 50, 50, 50, 0, 180);
		g.drawString("好好学习", 0, 150);// 注意，字符串型的x,y在字符中，而不是左上顶点；
		char []a= {'好','好','学','习'};
		g.drawChars(a, 0, 4, 50, 150);// data数组，offset为数据初始偏移量，length为要绘制的字符数，x,y文本基线的xy坐标，
		g.drawLine(100,150, 200, 150);//x1,y1,x2,y2 连线，
		g.drawString("软件1701 郝极平", 0, 200);
		g.drawString("学号2017011525", 100, 200);
	}
}
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