public void explosionAt(float mx, float my, float range, float power) {
float x = particle.getX();
float y = particle.getY();
float dx = x - mx;
float dy = y - my;
if (dx == 0) dx += 0.000001f;
if (dy == 0) dy += 0.000001f;
float d = dx * dx + dy * dy;
if (d < range * range) {
Vector push = new Vector(dx, dy, 0);
push.normalize();
push.scale(power * (1 - d / range / range));
particle.applyForce(push);
}
}
public void render() {
float x = particle.getX();
float y = particle.getY();
float l = x - width / 2;
float r = x + width / 2;
float t = y + height / 2;
float b = y - height / 2;
GL11.glColor3f(red, green, blue);
// draw quad
GL11.glBegin(GL11.GL_QUADS);
GL11.glVertex2f(l, b);
GL11.glVertex2f(r, b);
GL11.glVertex2f(r, t);
GL11.glVertex2f(l, t);
GL11.glEnd();
}
public void update(int ms) {
float x = particle.getX();
float y = particle.getY();
Vector f = new Vector(0f, -0.001f, 0f);
float l = 50, r = 750;
float t = 550, b = 50;
if (x < l) f.x += 0.002f;
else if (x > r) f.x -= 0.002f;
if (y < b) f.y += 0.002f;
else if (y > t) f.y -= 0.002f;
particle.applyForce(f);
particle.integrate(ms);
particle.clearForces();
}
public String toString() {
return "<Ball x:" + particle.getX() + " y:" + particle.getY() + ">";
}