看看这个程序,对你有些帮助吗~~ import java.awt.*; import java.awt.geom.*; import javax.swing.*;public class b { public static void main(String[] args) { DrawFrame frame = new DrawFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.show(); } }/** A frame that contains a panel with drawings */ class DrawFrame extends JFrame { public DrawFrame() { setTitle("DrawTest"); setSize(WIDTH, HEIGHT); // add panel to frame DrawPanel panel = new DrawPanel(); Container contentPane = getContentPane(); contentPane.add(panel); } public static final int WIDTH = 400; public static final int HEIGHT = 400; }/** A panel that displays rectangles and ellipses. */ class DrawPanel extends JPanel { public void paintComponent(Graphics g) { super.paintComponent(g); Graphics2D g2 = (Graphics2D)g; // draw a rectangle double leftX = 100; double topY = 100; double width = 200; double height = 150; Rectangle2D rect = new Rectangle2D.Double(leftX, topY, width, height); g2.draw(rect); // draw the enclosed ellipse Ellipse2D ellipse = new Ellipse2D.Double(); ellipse.setFrame(rect); g2.draw(ellipse); // draw a diagonal line g2.draw(new Line2D.Double(leftX, topY, leftX + width, topY + height)); // draw a circle with the same center double centerX = rect.getCenterX(); double centerY = rect.getCenterY(); double radius = 150; Ellipse2D circle = new Ellipse2D.Double(); circle.setFrameFromCenter(centerX, centerY, centerX + radius, centerY + radius); g2.draw(circle); } }
比如 super.paintComponent 啊什么的如果你的重写的 paintComponent 方法那你就应该在这个方法里一次性把 ArrayList 中所有的图形都画完,只在开头调一次 super.paintComponent
视频简介
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shapes.add(s);
repaint();
}public void paintComponent(Graphics g){
super.paintComponent(g);
Graphics2D g2d = (Graphics2D)g;
g2d.setPaint(Color.BLACK);
for(Shape shape : shapes){
g2d.draw(shape);
}
}
import java.awt.*;
import java.awt.geom.*;
import javax.swing.*;public class b
{
public static void main(String[] args)
{
DrawFrame frame = new DrawFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.show();
}
}/**
A frame that contains a panel with drawings
*/
class DrawFrame extends JFrame
{
public DrawFrame()
{
setTitle("DrawTest");
setSize(WIDTH, HEIGHT); // add panel to frame DrawPanel panel = new DrawPanel();
Container contentPane = getContentPane();
contentPane.add(panel);
} public static final int WIDTH = 400;
public static final int HEIGHT = 400;
}/**
A panel that displays rectangles and ellipses.
*/
class DrawPanel extends JPanel
{
public void paintComponent(Graphics g)
{
super.paintComponent(g);
Graphics2D g2 = (Graphics2D)g; // draw a rectangle double leftX = 100;
double topY = 100;
double width = 200;
double height = 150; Rectangle2D rect = new Rectangle2D.Double(leftX, topY,
width, height);
g2.draw(rect); // draw the enclosed ellipse Ellipse2D ellipse = new Ellipse2D.Double();
ellipse.setFrame(rect);
g2.draw(ellipse); // draw a diagonal line g2.draw(new Line2D.Double(leftX, topY,
leftX + width, topY + height)); // draw a circle with the same center double centerX = rect.getCenterX();
double centerY = rect.getCenterY();
double radius = 150; Ellipse2D circle = new Ellipse2D.Double();
circle.setFrameFromCenter(centerX, centerY,
centerX + radius, centerY + radius);
g2.draw(circle);
}
}