Originally Posted by
Eranga
Hi shelqa,
Welcome to our community. 
Before post again here please read FAQ page of our community. And at the same time, please keep in mind that no one here in our community wants just give a code. What we do is, giving helping hand to anyone who stuck with anything related to Java.
This is code:
import java.awt.*;
import java.awt.geom.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
public class BSpline extends JApplet {
public static void main(String s[]) {
JFrame frame = new JFrame();
frame.setTitle("B-Spline");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOS E);
JApplet applet = new BSpline();
applet.init();
frame.getContentPane().add(applet);
frame.pack();
frame.setVisible(true);
}
public void init() {
JPanel panel = new BSplinePanel();
getContentPane().add(panel);
}
}
class BSplinePanel extends JPanel
implements MouseListener, MouseMotionListener {
Vector points = null;
boolean completed = true;
public BSplinePanel() {
setPreferredSize(new Dimension(640, 480));
setBackground(Color.white);
addMouseListener(this);
addMouseMotionListener(this);
points = new Vector();
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2 = (Graphics2D)g;
Point p0 = null;
Point p1 = null;
Point p2 = null;
Point p3 = null;
float x1, y1, x2, y2, x3, y3, x4, y4;
Iterator it = points.iterator();
if (it.hasNext()) {
p1 = (Point)(it.next());
}
while (it.hasNext()) {
p2 = (Point)(it.next());
g2.drawLine(p1.x, p1.y, p2.x, p2.y);
p1 = p2;
}
GeneralPath spline = new GeneralPath();
int n = points.size();
if (n == 0) return;
p1 = (Point)points.get(0);
spline.moveTo(p1.x, p1.y);
g2.drawRect(p1.x-3, p1.y-3, 6, 6);
p1 = (Point)points.get(1);
p2 = (Point)points.get(2);
p3 = (Point)points.get(3);
x1 = p1.x;
y1 = p1.y;
x2 = (p1.x + p2.x)/2.0f;
y2 = (p1.y + p2.y)/2.0f;
x4 = (2.0f*p2.x+p3.x)/3.0f;
y4 = (2.0f*p2.y+p3.y)/3.0f;
x3 = (x2+x4)/2.0f;
y3 = (y2+y4)/2.0f;
spline.curveTo(x1, y1, x2, y2, x3, y3);
g2.drawRect((int)x1-3, (int)y1-3, 6, 6);
g2.drawRect((int)x2-3, (int)y2-3, 6, 6);
g2.drawRect((int)x3-3, (int)y3-3, 6, 6);
for (int i = 2; i < n - 4; i++) {
p1 = p2;
p2 = p3;
p3 = (Point)points.get(i+2);
x1 = x4;
y1 = y4;
x2 = (p1.x+2.0f*p2.x)/3.0f;
y2 = (p1.y+2.0f*p2.y)/3.0f;
x4 = (2.0f*p2.x+p3.x)/3.0f;
y4 = (2.0f*p2.y+p3.y)/3.0f;
x3 = (x2+x4)/2.0f;
y3 = (y2+y4)/2.0f;
spline.curveTo(x1,y1,x2,y2,x3,y3);
g2.drawRect((int)x1-3, (int)y1-3, 6, 6);
g2.drawRect((int)x2-3, (int)y2-3, 6, 6);
g2.drawRect((int)x3-3, (int)y3-3, 6, 6);
}
p1 = p2;
p2 = p3;
p3 = (Point)points.get(n-2);
x1 = x4;
y1 = y4;
x2 = (p1.x+2.0f*p2.x)/3.0f;
y2 = (p1.y+2.0f*p2.y)/3.0f;
x4 = (p2.x+p3.x)/2.0f;
y4 = (p2.y+p3.y)/2.0f;
x3 = (x2+x4)/2.0f;
y3 = (y2+y4)/2.0f;
spline.curveTo(x1,y1,x2,y2,x3,y3);
g2.drawRect((int)x1-3, (int)y1-3, 6, 6);
g2.drawRect((int)x2-3, (int)y2-3, 6, 6);
g2.drawRect((int)x3-3, (int)y3-3, 6, 6);
p2 = p3;
p3 = (Point)points.get(n-1);
x1 = x4;
y1 = y4;
x2 = p2.x;
y2 = p2.y;
x3 = p3.x;
y3 = p3.y;
spline.curveTo(x1,y1,x2,y2,x3,y3);
g2.drawRect((int)x1-3, (int)y1-3, 6, 6);
g2.drawRect((int)x2-3, (int)y2-3, 6, 6);
g2.drawRect((int)x3-3, (int)y3-3, 6, 6);
g2.draw(spline);
}
public void mouseClicked(MouseEvent ev) {
}
public void mouseEntered(MouseEvent ev) {
}
public void mouseExited(MouseEvent ev) {
}
public void mousePressed(MouseEvent ev) {
Graphics g = getGraphics();
if (completed) {
points.clear();
completed = false;
}
if (ev.getClickCount() == 1) {
Point p =ev.getPoint();
points.add(p);
g.fillOval(p.x-3, p.y-3, 6, 6);
}
}
public void mouseReleased(MouseEvent ev) {
if (ev.getClickCount() > 1) {
completed = true;
repaint();
}
}
public void mouseMoved(MouseEvent ev) {
}
public void mouseDragged(MouseEvent ev) {
}
}
and I need to modify to write my project
By SHKELQA
Linear Mode
