Oval collision detection not working properly
- by William
So I'm trying to implement a test where a oval can connect with a circle, but it's not working.
edist = (float) Math.sqrt(Math.pow((px + ((pwidth/2) )) - (bx + (bsize/2)), 2) + Math.pow(-((py + ((pwidth/2)) ) - (bx + (bsize/2))), 2));
and here is the full code (requires Slick2D):
import org.newdawn.slick.AppGameContainer;
import org.newdawn.slick.BasicGame;
import org.newdawn.slick.Color;
import org.newdawn.slick.GameContainer;
import org.newdawn.slick.Graphics;
import org.newdawn.slick.Input;
import org.newdawn.slick.SlickException;
public class ColTest extends BasicGame{
float px = 50;
float py = 50;
float pheight = 50;
float pwidth = 50;
float bx = 200;
float by = 200;
float bsize = 200;
float edist;
float pspeed = 3;
Input input;
public ColTest()
{
super("ColTest");
}
@Override
public void init(GameContainer gc)
throws SlickException {
}
@Override
public void update(GameContainer gc, int delta)
throws SlickException
{
input = gc.getInput();
try{
if(input.isKeyDown(Input.KEY_UP))
py-=pspeed;
if(input.isKeyDown(Input.KEY_DOWN))
py+=pspeed;
if(input.isKeyDown(Input.KEY_LEFT))
px-=pspeed;
if(input.isKeyDown(Input.KEY_RIGHT))
px+=pspeed;
}
catch(Exception e){}
}
public void render(GameContainer gc, Graphics g)
throws SlickException
{
g.setColor(new Color(255,255,255));
g.drawString("col: " + col(), 10, 10);
g.drawString("edist: " + edist + " dist: " + dist, 10, 100);
g.fillRect(px, py, pwidth, pheight);
g.setColor(new Color(255,0,255));
g.fillOval(px, py, pwidth, pheight);
g.setColor(new Color(255,255,255));
g.fillOval(200, 200, 200, 200);
}
public boolean col(){
edist = (float) Math.sqrt(Math.pow((px + ((pwidth/2) )) - (bx + (bsize/2)), 2) + Math.pow(-((py + ((pwidth/2)) ) - (bx + (bsize/2))), 2));
if(edist <= (bsize/2) + (px + (pwidth/2)))
return true;
else
return false;
}
public float rotate(float x, float y, float ox, float oy, float a, boolean b)
{
float dst = (float) Math.sqrt(Math.pow(x-ox,2.0)+ Math.pow(y-oy,2.0));
float oa = (float) Math.atan2(y-oy,x-ox);
if(b)
return (float) Math.cos(oa + Math.toRadians(a))*dst+ox;
else
return (float) Math.sin(oa + Math.toRadians(a))*dst+oy;
}
public static void main(String[] args)
throws SlickException
{
AppGameContainer app =
new AppGameContainer( new ColTest() );
app.setShowFPS(false);
app.setAlwaysRender(true);
app.setTargetFrameRate(60);
app.setDisplayMode(800, 600, false);
app.start();
}
}
