Drawing random lines from point to point (also generated random) - math

Question

I need a little help with java.
I need to create some curves between two points.
Application needs to create a random number of curves that will
connect from random generated begin point to random generated end point.
Here is my code so far:
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package tryproject;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.RenderingHints;
import java.awt.geom.AffineTransform;
import java.awt.geom.QuadCurve2D;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Random;
import javax.swing.JPanel;
/**
*
* #author Q
*/
public class GUI extends JPanel{
#Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
ArrayList<Point> jaa = new ArrayList<Point>();
Random ja = new Random();
Random p = new Random();
int x = ja.nextInt(50) +50;
int y = ja.nextInt(150) + 150;
Point pocetnaTacka = new Point(Math.abs(ja.nextInt(150)),Math.abs(ja.nextInt(150)));
Point zavrsmaTacka = new Point(Math.abs(ja.nextInt(300) ) ,Math.abs(ja.nextInt(300)));
int lx = pocetnaTacka.x;
int ly = pocetnaTacka.y;
jaa.add(pocetnaTacka);
int rastojanje = (pocetnaTacka.x - zavrsmaTacka.x)/10;
for (int i = 1;i< Math.abs(ja.nextInt(8));i++){
x = lx + Math.abs(ja.nextInt(50));
y = ly + Math.abs(ja.nextInt(50));
jaa.add(new Point(x,y));
lx = x;
ly = y;
}
Graphics2D g2 = (Graphics2D) g;
RenderingHints rh = new RenderingHints(
RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
g2.setRenderingHints(rh);
jaa.add(zavrsmaTacka);
Point lastpp = (Point)pocetnaTacka.clone();
for(Point pp: jaa)
{
QuadCurve2D q = new QuadCurve2D.Float();
// draw QuadCurve2D.Float with set coordinates
q.setCurve(lastpp.x, lastpp.y, pp.x/3, pp.y/3, pp.x, pp.y);
g2.draw(q);
lastpp = (Point) pp.clone();
}
for(Point aa: jaa)
{
System.out.println(aa.x + " , "+aa.y);
}
}
}
This is how it should look but i cant get it like this:
http://www.dodaj.rs/f/2U/qT/4LubxcQN/everytime.png
And every time application runs Two new point will be generated and curves to ..
I tried with sin , cos functions but i can't get it to work between two point.
Can anybody help me .
Thanks in advance.

Answer 1

I solved this problem. :
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package tryproject2;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.RenderingHints;
import java.awt.geom.QuadCurve2D;
import java.util.ArrayList;
import java.util.Random;
import javax.swing.JPanel;
/**
*
* #author Q
*/
public class GUI extends JPanel {
#Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2 = (Graphics2D)g;
ArrayList<Point> jaa = new ArrayList<Point>();
Random pocetnaikrajnja = new Random();
RenderingHints rh = new RenderingHints(
RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
g2.setRenderingHints(rh);
g2.setColor(Color.BLUE);
Point pocetnaTacka = new Point(Math.abs(pocetnaikrajnja.nextInt(150)), Math.abs(pocetnaikrajnja.nextInt(200) + 100));
g2.fillOval(pocetnaTacka.x,pocetnaTacka.y, 5, 5);
jaa.add(pocetnaTacka);
Point poslednjatacka = (Point) pocetnaTacka.clone();
for (int i = 1;i< 6;i++){
Point p = new Point(poslednjatacka.x + Math.abs(pocetnaikrajnja.nextInt(30) + 30),pocetnaTacka.y - Math.abs(pocetnaikrajnja.nextInt(30) + 30));
poslednjatacka = p;
jaa.add(p);
}
Point zavrsnaTacka = null;
zavrsnaTacka = new Point(jaa.get(jaa.size()-1).x+Math.abs(pocetnaikrajnja.nextInt(15) + 15),jaa.get(jaa.size()-1).y-70);
jaa.add(zavrsnaTacka);
g2.setColor(Color.RED);
g2.fillOval(zavrsnaTacka.x,zavrsnaTacka.y, 5, 5);
for(int i=0;i<jaa.size()-1;i++)
{
QuadCurve2D q = new QuadCurve2D.Float();
//if(i%2==0){
q.setCurve(jaa.get(i).x, jaa.get(i).y,jaa.get(i).x/1.2,jaa.get(i).y-Math.abs(pocetnaikrajnja.nextInt(35) + 35), jaa.get(i+1).x, jaa.get(i+1).y);
//}
//else
//{
// q.setCurve(jaa.get(i).x, jaa.get(i).y,jaa.get(i).x/1.2,jaa.get(i).y+Math.abs(pocetnaikrajnja.nextInt(35) + 35), jaa.get(i+1).x, jaa.get(i+1).y);
//}
g2.draw(q);
}
/**
* Sakriven kod za grane.
for(int i=1;i<jaa.size()-Math.abs(pocetnaikrajnja.nextInt(2)+1);i= i + Math.abs(pocetnaikrajnja.nextInt(5)))
{
QuadCurve2D q = new QuadCurve2D.Float();
if(i%2==0)
q.setCurve(jaa.get(i).x, jaa.get(i).y,jaa.get(i).x/1.2,jaa.get(i).y/1.2, jaa.get(i).x + Math.abs(pocetnaikrajnja.nextInt(5) + 7), jaa.get(i).y - Math.abs(pocetnaikrajnja.nextInt(10) + 60));
else
q.setCurve(jaa.get(i).x, jaa.get(i).y,jaa.get(i).x/1.2,jaa.get(i).y/1.2, jaa.get(i).x + Math.abs(pocetnaikrajnja.nextInt(5) + 7), jaa.get(i).y + Math.abs(pocetnaikrajnja.nextInt(10) + 60));
g2.draw(q);
}
*/
}
}