Add more n-point gradients (#139)

orx-shade-styles/src/main/kotlin/NPointGradient.kt

@@ -8,23 +8,20 @@ import org.openrndr.math.Vector3
 
 @Description("N-Point gradient")
 class NPointGradient(
-        numPoints: Int,
         colors: Array<ColorRGBa>,
         points: Array<Vector2> = arrayOf(Vector2.ZERO)) : ShadeStyle() {
 
-    var numPoints: Int by Parameter()
     var colors: Array<ColorRGBa> by Parameter()
     var points: Array<Vector2> by Parameter()
 
     init {
-        this.numPoints = numPoints
         this.colors = colors
         this.points = points
 
         fragmentTransform = """
                 float sum = 0;
                 vec4 rgba = vec4(0.0);
-                for(int i=0; i<p_numPoints; i++) {
+                for(int i=0; i<p_points_SIZE; i++) {
                     float dist = 1.0 / (1.0 + distance(p_points[i], c_screenPosition));
                     sum += dist;
                     rgba += p_colors[i] * dist;