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BezierCurve.java
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BezierCurve.java
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import java.awt.Color;
import java.awt.Graphics;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionListener;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class BezierCurve {
static JFrame frame = new JFrame("Bézier Curve");
Canvas canvas;
int code;
// P0
int x0 = 100;
int y0 = 900;
//P1
int x1 = 500;
int y1 = 100;
//P2
int x2 = 900;
int y2 = 900;
int size = 2;
int range = 100;
move0 move_0 = new move0();
move1 move_1 = new move1();
move2 move_2 = new move2();
public class move0 implements MouseMotionListener {
public void mouseDragged(MouseEvent e) {
x0 = e.getX() - 8;
y0 = e.getY() - 40;
frame.repaint();
}
public void mouseMoved(MouseEvent e) {}
}
public class move1 implements MouseMotionListener {
public void mouseDragged(MouseEvent e) {
x1 = e.getX() - 8;
y1 = e.getY() - 40;
frame.repaint();
}
public void mouseMoved(MouseEvent e) {}
}
public class move2 implements MouseMotionListener {
public void mouseDragged(MouseEvent e) {
x2 = e.getX() - 8;
y2 = e.getY() - 40;
frame.repaint();
}
public void mouseMoved(MouseEvent e) {}
}
public static void removeListeners(move0 obj0, move1 obj1, move2 obj2) {
frame.removeMouseMotionListener(obj0);
frame.removeMouseMotionListener(obj1);
frame.removeMouseMotionListener(obj2);
}
public class Canvas extends JPanel {
public void paintComponent(Graphics g) {
super.paintComponent(g);
g.setColor(Color.RED);
float t = 0.00001f;
float T;
for (int x = 0; x <= (1/t); x++) {
T = t * x;
int xi = x1 + ((int)((x0 - x1) * T));
int yi = y1 + ((int)((y0 - y1) * T));
int xf = x2 + ((int)((x1 - x2) * T));
int yf = y2 + ((int)((y1 - y2) * T));
int X = xf - (int)((xf - xi) * T);
int Y = yf - (int)((yf - yi) * T);
g.drawLine(X, Y, X, Y);
}
g.setColor(Color.BLACK);
g.fillOval(x0, y0, size, size);
g.fillOval(x1, y1, size, size);
g.fillOval(x2, y2, size, size);
g.drawString("P0", x0, y0 - 5);
g.drawString("P1", x1, y1 - 5);
g.drawString("P2", x2, y2 - 5);
g.drawLine(x0, y0, x1, y1);
g.drawLine(x1, y1, x2, y2);
}
}
public BezierCurve() {
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(1000, 1000);
frame.setResizable(true);
frame.setLocationRelativeTo(null);
frame.addMouseMotionListener(new MouseMotionListener() {
public void mouseMoved(MouseEvent e) {
if ((e.getX() > x0 - range && e.getX() < x0 + range) && (e.getY() > y0 - range && e.getY() < y0 + range)) {
removeListeners(move_0, move_1, move_2);
frame.addMouseMotionListener(move_0);
}
if ((e.getX() > x1 - range && e.getX() < x1 + range) && (e.getY() > y1 - range && e.getY() < y1 + range)) {
removeListeners(move_0, move_1, move_2);
frame.addMouseMotionListener(move_1);
}
if ((e.getX() > x2 - range && e.getX() < x2 + range) && (e.getY() > y2 - range && e.getY() < y2 + range)) {
removeListeners(move_0, move_1, move_2);
frame.addMouseMotionListener(move_2);
}
}
public void mouseDragged(MouseEvent e) {}
});
canvas = new Canvas();
frame.add(canvas);
frame.setVisible(true);
}
public static void main(String [] args) {
new BezierCurve();
}
}