如何添加额外的控制点到贝塞尔曲线？

• Z时代
• 2024-01-10
• 分类：问答

在这里是与总共4个控制点创建Bezier曲线的代码：如何添加额外的控制点到贝塞尔曲线？

• 蓝颜色是起始和结束的控制点。
• 青色是第二和第三个控制点。

我想一个控制点从这些3个控制点的添加到现有的曲线，所以现在我有3个青色的彩色控制点，这样我可以调整曲线（如拖动曲线），而不是2个控制点。这需要做什么？

我附上了下面的代码的输出作为附件。

import java.awt.Color; 
import java.awt.Frame; 
import java.awt.Graphics; 
import java.awt.Graphics2D; 
import java.awt.event.MouseEvent; 
import java.awt.event.MouseListener; 
import java.awt.event.MouseMotionListener; 
import java.awt.event.WindowAdapter; 
import java.awt.event.WindowEvent; 
import java.awt.geom.GeneralPath; 
public class Piyush extends Frame implements MouseListener, MouseMotionListener { 
// private int[] xs = { 75, 150, 300, 375 }; 
// 
// private int[] ys = { 250, 100, 350, 250 }; 
    private int[] xs = { 75, 200, 300, 375 }; 
    private int[] ys = { 250, 100, 100, 250 }; 
    private int dragIndex = NOT_DRAGGING; 
    private final static int NEIGHBORHOOD = 15; 
    private final static int NOT_DRAGGING = -1; 
    public static void main(String[] args) { 
    new Piyush(); 
    } 
    public Piyush() { 
    setSize(500, 450); 
    addMouseListener(this); 
    addMouseMotionListener(this); 
    addWindowListener(new WindowAdapter() { 
     public void windowClosing(WindowEvent e) { 
     System.exit(0); 
     } 
    }); 
    setVisible(true); 
    } 
    public void paint(Graphics g) { 
    for (int i = 0; i < 4; i++) { 
     if (i == 0 || i == 3){ 
     g.setColor(Color.blue); 
     g.fillOval(xs[i] - 6, ys[i] - 6, 12, 12);} 
     else{ 
     g.setColor(Color.cyan); 
     g.fillOval(xs[i] - 6, ys[i] - 6, 12, 12); 
     } 
    } 
    Graphics2D g2d = (Graphics2D) g; 
    g2d.setColor(Color.black); 
    GeneralPath path = new GeneralPath(); 
    path.moveTo(xs[0], ys[0]); 
    path.curveTo(xs[1], ys[1], xs[2], ys[2], xs[3], ys[3]); 
    g2d.draw(path); 
    } 
    public void mousePressed(MouseEvent e) { 
    dragIndex = NOT_DRAGGING; 
    int minDistance = Integer.MAX_VALUE; 
    int indexOfClosestPoint = -1; 
    for (int i = 0; i < 4; i++) { 
     int deltaX = xs[i] - e.getX(); 
     int deltaY = ys[i] - e.getY(); 
     int distance = (int) (Math.sqrt(deltaX * deltaX + deltaY * deltaY)); 
     if (distance < minDistance) { 
     minDistance = distance; 
     indexOfClosestPoint = i; 
     } 
    } 
    if (minDistance > NEIGHBORHOOD) 
     return; 
    dragIndex = indexOfClosestPoint; 
    } 
    public void mouseReleased(MouseEvent e) { 
    if (dragIndex == NOT_DRAGGING) 
     return; 
    xs[dragIndex] = e.getX(); 
    ys[dragIndex] = e.getY(); 
    dragIndex = NOT_DRAGGING; 
    repaint(); 
    } 
    public void mouseDragged(MouseEvent e) { 
    if (dragIndex == NOT_DRAGGING) 
     return; 
    xs[dragIndex] = e.getX(); 
    ys[dragIndex] = e.getY(); 
    repaint(); 
    } 
    public void mouseClicked(MouseEvent e) { 
    } 
    public void mouseEntered(MouseEvent e) { 
    } 
    public void mouseExited(MouseEvent e) { 
    } 
    public void mouseMoved(MouseEvent e) { 
    } 
} 

回答：

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