请用java小程序代码实现梁友栋-Barsky算法进行给定直线的裁剪,裁剪窗口顶点坐标: (100,100), (100,200), (200,100),(200,200),被裁剪直线端点坐标: (100,50), (300,200),裁剪窗口、裁剪前直线、裁剪后直线用3种不同颜色绘制。
时间: 2023-10-09 20:04:22 浏览: 109
Liang-Barsky直线段裁剪算法.docx
以下是使用Java实现梁友栋-Barsky算法进行直线裁剪的代码:
```java
import java.awt.Color;
import java.awt.Graphics;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class LineClipBarsky extends JPanel {
private static final long serialVersionUID = 1L;
private int xMin = 100;
private int xMax = 200;
private int yMin = 100;
private int yMax = 200;
private double u1 = 0.0;
private double u2 = 1.0;
private int x1 = 100;
private int y1 = 50;
private int x2 = 300;
private int y2 = 200;
private int x1Clip = x1;
private int y1Clip = y1;
private int x2Clip = x2;
private int y2Clip = y2;
public void clipLine() {
int deltaX = x2 - x1;
int deltaY = y2 - y1;
double p[] = {-deltaX, deltaX, -deltaY, deltaY};
double q[] = {x1 - xMin, xMax - x1, y1 - yMin, yMax - y1};
for (int i = 0; i < 4; i++) {
if (p[i] == 0) {
if (q[i] < 0) {
// 线段在窗口外
return;
}
} else {
double u = q[i] / p[i];
if (p[i] < 0) {
u1 = Math.max(u1, u);
} else {
u2 = Math.min(u2, u);
}
}
}
if (u1 > u2) {
// 线段在窗口外
return;
}
x1Clip = (int) Math.round(x1 + u1 * deltaX);
y1Clip = (int) Math.round(y1 + u1 * deltaY);
x2Clip = (int) Math.round(x1 + u2 * deltaX);
y2Clip = (int) Math.round(y1 + u2 * deltaY);
}
@Override
public void paint(Graphics g) {
// 绘制裁剪窗口
g.setColor(Color.RED);
g.drawRect(xMin, yMin, xMax - xMin, yMax - yMin);
// 绘制裁剪前直线
g.setColor(Color.BLUE);
g.drawLine(x1, y1, x2, y2);
// 裁剪直线
clipLine();
// 绘制裁剪后直线
g.setColor(Color.GREEN);
g.drawLine(x1Clip, y1Clip, x2Clip, y2Clip);
}
public static void main(String[] args) {
JFrame frame = new JFrame();
LineClipBarsky panel = new LineClipBarsky();
frame.add(panel);
frame.setSize(400, 400);
frame.setVisible(true);
}
}
```
在代码中,我们首先定义了裁剪窗口的顶点坐标、被裁剪直线的端点坐标,以及梁友栋-Barsky算法中所需的参数。然后,在`clipLine()`方法中,我们根据梁友栋-Barsky算法的原理计算出被裁剪直线的裁剪后端点坐标。最后,在`paint()`方法中,我们分别用三种颜色绘制出裁剪窗口、裁剪前直线和裁剪后直线。运行程序后,我们就可以看到绘制出的图形。
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