package org.newdawn.slick.svg;
import org.newdawn.slick.geom.Shape;
import org.newdawn.slick.geom.TexCoordGenerator;
import org.newdawn.slick.geom.Transform;
import org.newdawn.slick.geom.Vector2f;
/**
* A filler to apply a SVG radial gradient across a shape
*
* @author kevin
*/
public class RadialGradientFill implements TexCoordGenerator {
/** The centre of the gradient */
private Vector2f centre;
/** The radius before the gradient is complete */
private float radius;
/** The gradient to apply */
private Gradient gradient;
/** The shape being filled */
private Shape shape;
/**
* Create a new fill for a radial gradient
*
* @param shape The shape being filled
* @param trans The transform given for the shape in the SVG
* @param gradient The gradient to apply across the shape
*/
public RadialGradientFill(Shape shape, Transform trans, Gradient gradient) {
this.gradient = gradient;
radius = gradient.getR();
float x = gradient.getX1();
float y = gradient.getY1();
float[] c = new float[] {x,y};
gradient.getTransform().transform(c, 0, c, 0, 1);
trans.transform(c, 0, c, 0, 1);
float[] rt = new float[] {x,y-radius};
gradient.getTransform().transform(rt, 0, rt, 0, 1);
trans.transform(rt, 0, rt, 0, 1);
centre = new Vector2f(c[0],c[1]);
Vector2f dis = new Vector2f(rt[0],rt[1]);
radius = dis.distance(centre);
}
/**
* @see org.newdawn.slick.geom.TexCoordGenerator#getCoordFor(float, float)
*/
public Vector2f getCoordFor(float x, float y) {
float u = centre.distance(new Vector2f(x,y));
u /= radius;
if (u > 0.99f) {
u = 0.99f;
}
return new Vector2f(u,0);
}
}