有了这段程序,我也可以用我的方式给祖国庆生了! package com.heima.test;
import java.awt.RenderingHints;
import java.awt.geom.AffineTransform;
import java.awt.geom.GeneralPath;
import javax.swing.JFrame;
public class PaintFlag extends JFrame {
private static final long serialVersionUID = 1L;
private int width = 288, height = width / 3 * 2;
private double maxR = 0.15, minR = 0.05;
private double maxX = 0.50, maxY = 0.50;
private double[] minX = { 0.75, 0.85, 0.85, 0.75 };
private double[] minY = { 0.35, 0.45, 0.60, 0.70 };
public PaintFlag() {
setTitle("黑马程序猿--为祖国庆生");
setDefaultCloseOperation(EXIT_ON_CLOSE);
}
public void paint(java.awt.Graphics graphics) {
super.paint(graphics);
java.awt.Graphics2D g = (java.awt.Graphics2D) graphics;
g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
// 画棋面
g.setColor(java.awt.Color.red);
g.fillRect(50, 50, width, height);
g.setColor(java.awt.Color.yellow);
// 画大星星
double ox = height * maxX, oy = height * maxY;
g.fill(createPentacle(ox, oy, height * maxR, -Math.PI / 2));
// 画小星星
for (int idx = 0; idx < 4; idx++) {
double sx = minX[idx] * height, sy = minY[idx] * height;
double theta = Math.atan2(oy - sy, ox - sx);
g.fill(createPentacle(sx, sy, height * minR, theta));
}
}
/**
* 创建一个五角星形状. 该五角星的中心坐标为(sx,sy),中心到顶点的距离为radius,其中某个顶点与中心的连线的偏移角度为theta(弧度)
*
* @return pentacle 一个☆
*/
public static java.awt.Shape createPentacle(double sx, double sy,
double radius, double theta) {
final double arc = Math.PI / 5;
final double rad = Math.sin(Math.PI / 10) / Math.sin(3 * Math.PI / 10);
GeneralPath path = new GeneralPath();
path.moveTo(1, 0);
for (int idx = 0; idx < 5; idx++) {
path.lineTo(rad * Math.cos((1 + 2 * idx) * arc),
rad * Math.sin((1 + 2 * idx) * arc));
path.lineTo(Math.cos(2 * (idx + 1) * arc),
Math.sin(2 * (idx + 1) * arc));
}
path.closePath();
AffineTransform atf = AffineTransform.getScaleInstance(radius, radius);
atf.translate(sx / radius, sy / radius);
atf.rotate(theta);
return atf.createTransformedShape(path);
}
public static void main(String[] args) {
PaintFlag flag = new PaintFlag();
flag.setBounds(100, 100, 400, 400);
flag.setVisible(true);
}
}
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