box2dLight.PointLight Maven / Gradle / Ivy
Show all versions of box2dlights Show documentation
package box2dLight;
import com.badlogic.gdx.graphics.Color;
import com.badlogic.gdx.math.MathUtils;
/**
* Light shaped as a circle with given radius
*
* Extends {@link PositionalLight}
*
* @author kalle_h
*/
public class PointLight extends PositionalLight {
/**
* Creates light shaped as a circle with default radius (15f), color and
* position (0f, 0f)
*
* @param rayHandler
* not {@code null} instance of RayHandler
* @param rays
* number of rays - more rays make light to look more realistic
* but will decrease performance, can't be less than MIN_RAYS
*/
public PointLight(RayHandler rayHandler, int rays) {
this(rayHandler, rays, Light.DefaultColor, 15f, 0f, 0f);
}
/**
* Creates light shaped as a circle with given radius
*
* @param rayHandler
* not {@code null} instance of RayHandler
* @param rays
* number of rays - more rays make light to look more realistic
* but will decrease performance, can't be less than MIN_RAYS
* @param color
* color, set to {@code null} to use the default color
* @param distance
* distance of light
* @param x
* horizontal position in world coordinates
* @param y
* vertical position in world coordinates
*/
public PointLight(RayHandler rayHandler, int rays, Color color,
float distance, float x, float y) {
super(rayHandler, rays, color, distance, x, y, 0f);
}
@Override
public void update () {
updateBody();
if (dirty) setEndPoints();
if (cull()) return;
if (staticLight && !dirty) return;
dirty = false;
updateMesh();
}
/**
* Sets light distance
*
*
MIN value capped to 0.1f meter
*
Actual recalculations will be done only on {@link #update()} call
*/
@Override
public void setDistance(float dist) {
dist *= RayHandler.gammaCorrectionParameter;
this.distance = dist < 0.01f ? 0.01f : dist;
dirty = true;
}
/** Updates light basing on it's distance and rayNum **/
void setEndPoints() {
float angleNum = 360f / (rayNum - 1);
for (int i = 0; i < rayNum; i++) {
final float angle = angleNum * i;
sin[i] = MathUtils.sinDeg(angle);
cos[i] = MathUtils.cosDeg(angle);
endX[i] = distance * cos[i];
endY[i] = distance * sin[i];
}
}
/** Not applicable for this light type **/
@Deprecated
@Override
public void setDirection(float directionDegree) {
}
}