Java绘制心形曲线(笛卡尔曲线)

2014-05-28· 10725 次浏览
## 效果图 ![TIM截图20180509135245.bmp](https://image.xsoftlab.net/baike/articleImages/0e2c90ba9f10b24aea2722c63e5b522f.jpg) ## 代码 ```java import java.applet.Applet; import java.awt.Color; import java.awt.Graphics; import java.awt.Image; public class CartesianCurve extends Applet { private static final long serialVersionUID = -1616773050265562622L; Image image; Graphics graphics; int width = 568; int height = 350; @Override public void init() { setBackground(Color.black); this.setSize(width, height); image = createImage(width, height); graphics = image.getGraphics(); } @Override public void paint(Graphics g) { // 用红色来填充清除指定的矩形。 graphics.clearRect(0, 0, width, height); graphics.setColor(Color.red); double x, y, r; // 笛卡儿数学公式: (x*x+y*y-2ax)2=4a*a(x*x+y*y) for (int i = 0; i <= 90; i++) for (int j = 0; j <= 90; j++) { r = Math.PI / 45 * i * (1 - Math.sin(Math.PI / 45 * j)) * 18; x = r * Math.cos(Math.PI / 45 * j) * Math.sin(Math.PI / 45 * i) + width / 2; y = -r * Math.sin(Math.PI / 45 * j) + height / 4; graphics.fillOval((int) x, (int) y, 2, 2); } g.drawImage(image, 0, 0, this); } } ```