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  Drawing circle using circle equation directly , on mouse
Wed Apr 17, 2013 2:52 pm 

Drawing circle using circle equation directly , on mouse clicks - any number of circles.
java code
package drawIT;

import java.awt.Color;
import java.awt.Graphics;
import java.awt.event.MouseEvent;
import java.util.ArrayList;
import java.util.List;
import javax.swing.JFrame;
import javax.swing.event.MouseInputListener;

public class WindowDraw extends JFrame implements MouseInputListener {

private Point p1 = new Point();
private Point p2 = new Point();
private List list = new ArrayList();
private Circle circleObj;
private int clicks = 0;

public WindowDraw() {

setTitle("Drawing ");
addMouseListener(this);
setLocation(100, 100);
setSize(500, 500);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
}

@Override
public void paint(Graphics g) {
super.paint(g);
g.setColor(Color.white);
g.fillRect(0, 0, 600, 600);
g.setColor(Color.red);
Circle currentCircle;
for (int i = 0; i < list.size(); i++) {
currentCircle = (Circle) (list.get(i));
currentCircle.CircleDirect(g);
}
}

public static void main(String[] args) {
new WindowDraw();
}

@Override
public void mouseClicked(MouseEvent e) {
}

@Override
public void mousePressed(MouseEvent e) {
int x = e.getX();
int y = e.getY();

if (clicks == 0) {
circleObj = new Circle();
circleObj.setCenter(new Point(x, y));

clicks++;
} else {
circleObj.setP2(new Point(x, y));
circleObj.calRadius();
list.add(circleObj);
clicks = 0;
}
repaint();
}

@Override
public void mouseReleased(MouseEvent e) {
}

@Override
public void mouseEntered(MouseEvent e) {
}

@Override
public void mouseExited(MouseEvent e) {
}

@Override
public void mouseDragged(MouseEvent e) {
}

@Override
public void mouseMoved(MouseEvent e) {
}
}

class Point {

private int x;
private int y;

public Point() {
}

public Point(int x, int y) {
this.x = x;
this.y = y;
}

public int getX() {
return x;
}

public int getY() {
return y;
}

public void setX(int x) {
this.x = x;
}

public void setY(int y) {
this.y = y;
}
}

class Circle {

private Point center;
private Point p2;
private float radius;

public Circle() {
}

public Circle(Point center, Point p2) {
this.center = center;
this.p2 = p2;
radius = (float) Math.sqrt((double) ((center.getX()
- p2.getX()) * (center.getX() - p2.getX())) + ((center.getY()
- p2.getY()) * (center.getY() - p2.getY())));
}

public Point getCenter() {
return center;
}

public Point getP2() {
return p2;
}

public void setCenter(Point p1) {
this.center = p1;
}

public void setP2(Point p2) {
this.p2 = p2;
}

public void calRadius() {
radius = (float) Math.round(Math.sqrt((double) ((center.getX()
- p2.getX()) * (center.getX() - p2.getX())) + ((center.getY()
- p2.getY()) * (center.getY() - p2.getY()))));
}

public void setRadius(float radius) {
this.radius = radius;
}

public float getRadius() {
return radius;
}
void CircleDirect(Graphics g)
{
int xc = center.getX();
int yc = center.getY();
int R = (int) radius;

int x=0,y=R;
int R2=R*R;
Draw8Points(g,xc,yc,x,y);
while(x<y)
{
x++;
y=(int) Math.round(Math.sqrt((double)(R2-x*x)));
Draw8Points(g,xc,yc,x,y);
}
}

void Draw8Points(Graphics g,int xc,int yc, int a, int b)
{
g.drawOval(xc+a, yc+b, 1,1);
g.drawOval(xc-a, yc+b, 1,1);
g.drawOval(xc-a, yc-b, 1,1);
g.drawOval(xc+a, yc-b, 1,1);

g.drawOval(xc+b, yc+a, 1,1);
g.drawOval(xc-b, yc+a, 1,1);
g.drawOval(xc-b, yc-a, 1,1);
g.drawOval(xc+b, yc-a, 1,1);

}

}




Attachments:
CircleDirect.gif
CircleDirect.gif [ 12.03 KiB | Viewed 2251 times ]
Author:
Mastermind
User avatar Posts: 2704
Have thanks: 74 time
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