Source Code : Move the curve control point and redraw the curve

Java Is Open Source Programming Language You Can Download From Java and Java Libraries From http://www.oracle.com. Click Here to download
We provide this code related to title for you to solve your developing problem easily. Libraries which is import in this program you can download from http://www.oracle.com. Click Here or search from google with Libraries Name you get jar file related it

Move the curve control point and redraw the curve

   
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.MouseEvent;
import java.awt.geom.CubicCurve2D;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Line2D;
import java.awt.geom.Point2D;
import java.awt.geom.QuadCurve2D;

import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.event.MouseInputAdapter;

public class MainClass {
  public static void main(String[] args){
    JFrame frame = new JFrame();
    frame.getContentPane().add(new CurveApplet());

    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(200, 200);
    frame.setVisible(true);
  }
}

class CurveApplet extends JPanel {
  public CurveApplet() {
    super(new BorderLayout());
    pane = new CurvePane();
    add(pane,"Center");

    MouseHandler handler = new MouseHandler();
    pane.addMouseListener(handler);
    pane.addMouseMotionListener(handler);
  }

  class CurvePane extends JComponent {
    public CurvePane() {
      quadCurve = new QuadCurve2D.Double( 
          startQ.x, startQ.y, 
          control.x, control.y,
          endQ.x, endQ.y);

      cubicCurve = new CubicCurve2D.Double(
          startC.x, startC.y, 
          controlStart.x, controlStart.y,
          controlEnd.x, controlEnd.y,
          endC.x, endC.y);
    }

    public void paint(Graphics g) {
      Graphics2D g2D = (Graphics2D) g;
      quadCurve.ctrlx = ctrlQuad.getCenter().x;
      quadCurve.ctrly = ctrlQuad.getCenter().y;
      cubicCurve.ctrlx1 = ctrlCubic1.getCenter().x;
      cubicCurve.ctrly1 = ctrlCubic1.getCenter().y;
      cubicCurve.ctrlx2 = ctrlCubic2.getCenter().x;
      cubicCurve.ctrly2 = ctrlCubic2.getCenter().y;

      g2D.setPaint(Color.BLUE);
      g2D.draw(quadCurve);
      g2D.draw(cubicCurve);

      g2D.setPaint(Color.RED);
      ctrlQuad.draw(g2D);
      ctrlCubic1.draw(g2D);
      ctrlCubic2.draw(g2D);

      Line2D.Double tangent = new Line2D.Double(startQ, ctrlQuad.getCenter());
      g2D.draw(tangent);
      tangent = new Line2D.Double(endQ, ctrlQuad.getCenter());
      g2D.draw(tangent);

      tangent = new Line2D.Double(startC, ctrlCubic1.getCenter());
      g2D.draw(tangent);
      tangent = new Line2D.Double(endC, ctrlCubic2.getCenter());
      g2D.draw(tangent);

    }
  }

 
  Point2D.Double startQ = new Point2D.Double(50, 75);

  Point2D.Double endQ = new Point2D.Double(150, 75);

  Point2D.Double control = new Point2D.Double(80, 25); 

  Point2D.Double startC = new Point2D.Double(50, 150); 

  Point2D.Double endC = new Point2D.Double(150, 150); 

  Point2D.Double controlStart = new Point2D.Double(80, 100);

  Point2D.Double controlEnd = new Point2D.Double(160, 100); 

  Marker ctrlQuad = new Marker(control);

  Marker ctrlCubic1 = new Marker(controlStart);

  Marker ctrlCubic2 = new Marker(controlEnd);

  QuadCurve2D.Double quadCurve; 

  CubicCurve2D.Double cubicCurve; 

  CurvePane pane = new CurvePane();

  class Marker {
    public Marker(Point2D.Double control) {
      center = control; 
      circle = new Ellipse2D.Double(control.x - radius, control.y - radius, 2.0 * radius,
          2.0 * radius);
    }
    public void draw(Graphics2D g2D) {
      g2D.draw(circle);
    }

    Point2D.Double getCenter() {
      return center;
    }
    public boolean contains(double x, double y) {
      return circle.contains(x, y);
    }
    public void setLocation(double x, double y) {
      center.x = x; 
      center.y = y; 
      circle.x = x - radius; 
      circle.y = y - radius; 
    }

    Ellipse2D.Double circle; 

    Point2D.Double center; 

    static final double radius = 3;
  }

  class MouseHandler extends MouseInputAdapter {
    public void mousePressed(MouseEvent e) {
      if (ctrlQuad.contains(e.getX(), e.getY()))
        selected = ctrlQuad;
      else if (ctrlCubic1.contains(e.getX(), e.getY()))
        selected = ctrlCubic1;
      else if (ctrlCubic2.contains(e.getX(), e.getY()))
        selected = ctrlCubic2;
    }
    public void mouseReleased(MouseEvent e) {
      selected = null;
    }
    public void mouseDragged(MouseEvent e) {
      if (selected != null) {
        selected.setLocation(e.getX(), e.getY());
        pane.repaint(); 
      }
    }
    Marker selected = null;
  }
}

           
         
    
    
  

Thank with us