Add BoringGrid and Planes as drawing demonstrations.

src/xyz/marsavic/gfxlab/playground/GfxLab.java

@@ -4,9 +4,8 @@ import xyz.marsavic.functions.interfaces.A2;
 import xyz.marsavic.functions.interfaces.F1;
 import xyz.marsavic.gfxlab.*;
 import xyz.marsavic.gfxlab.elements.Output;
-import xyz.marsavic.gfxlab.graphics3d.raytracers.RayTracerSimple;
-import xyz.marsavic.gfxlab.graphics3d.scene.SceneTest1;
 import xyz.marsavic.gfxlab.gui.UtilsGL;
+import xyz.marsavic.gfxlab.playground.colorfunctions.Planes;
 import xyz.marsavic.gfxlab.tonemapping.ColorTransform;
 import xyz.marsavic.gfxlab.tonemapping.ToneMapping;
 import xyz.marsavic.gfxlab.tonemapping.colortransforms.Multiply;
@@ -28,11 +27,11 @@ public class GfxLab {
 						e(Fs::aFillFrameInt,
 								e(Fs::aFillFrameColor,
 										e(Fs::transformedColorFunction,
-//												e(Blobs::new, val(5), val(0.1), val(0.2)),
+												e(Planes::new),
-												e(RayTracerSimple::new,
+/*												e(RayTracerSimple::new,
 														e(SceneTest1::new)
 												),
-												e(TransformationsFromSize.toGeometric, eSize)
+*/												e(TransformationsFromSize.toGeometric, eSize)
 										)
 								),
 								e(Fs::toneMapping,

src/xyz/marsavic/gfxlab/playground/colorfunctions/BoringGrid.java

@@ -0,0 +1,16 @@
+package xyz.marsavic.gfxlab.playground.colorfunctions;
+
+import xyz.marsavic.geometry.Vector;
+import xyz.marsavic.gfxlab.Color;
+import xyz.marsavic.gfxlab.ColorFunctionT;
+
+public class BoringGrid implements ColorFunctionT {
+    @Override
+    public Color at(double t, Vector p) {
+        double linew = 0.01;
+        double gridw = 0.2;
+        return Color.gray((p.x() - linew/2)/gridw <= Math.floor((p.x() + linew/2)/gridw) ||
+                (p.y() - linew/2)/gridw <= Math.floor((p.y() + linew/2)/gridw) ?
+                0.9 : 0.05);
+    }
+}

src/xyz/marsavic/gfxlab/playground/colorfunctions/Planes.java

@@ -0,0 +1,80 @@
+package xyz.marsavic.gfxlab.playground.colorfunctions;
+
+import xyz.marsavic.geometry.Vector;
+import xyz.marsavic.gfxlab.Color;
+import xyz.marsavic.gfxlab.ColorFunctionT;
+import xyz.marsavic.gfxlab.elements.Element;
+import xyz.marsavic.utils.Defaults;
+import xyz.marsavic.utils.Numeric;
+
+
+public class Planes extends Element implements ColorFunctionT {
+
+	double speed = 5;
+
+	private double distance(double t) {
+		return speed * t;
+	}
+
+	double ballSpace = 0.8;
+	FakeBall [] balls;
+
+	public static final Defaults<Planes> $ = Defaults.args();
+
+	private class FakeBall {
+		Color c = Color.rgb(Math.random(), Math.random(), Math.random());
+		double r = Math.random()/4+0.25;
+		double xOffset;
+
+		double maxHeight = Math.random()/2;
+		double minHeight = -Math.random()/2;
+		double phaseOffset = Math.random();
+
+		public FakeBall(int offset) {
+			this.xOffset = offset*ballSpace + Math.random()/5;
+		}
+
+		public double currentHeight(double t) {
+			return (Numeric.sinT(distance(t)+phaseOffset)+1)*(maxHeight-minHeight)/2+minHeight;
+		}
+
+		public Vector center(double t) {
+			return Vector.xy(xOffset+distance(t), currentHeight(t));
+		}
+	}
+
+	public Planes() {
+		int ballNum = 20;
+
+		balls = new FakeBall[ballNum];
+		for (int i = 0; i < ballNum; i++) {
+			balls[i] = new FakeBall(i-ballNum/2);
+		}
+
+	}
+	ColorFunctionT ceil = new Blobs(5, 3.5, 0.2), floor = new BoringGrid();
+	
+	@Override
+	public Color at(double t, Vector p) {
+		for (FakeBall ball : balls) {
+			double distanceFromCenterSq = p.sub(ball.center(t)).length(),
+					rSqr = ball.r * ball.r;
+			if (distanceFromCenterSq < rSqr) {
+				return ball.c.mul((rSqr - distanceFromCenterSq) / rSqr);
+			}
+		}
+
+		double infinity = 0.15;
+		if (p.y() > infinity) {
+			return ceil.at(t, Vector.xy(p.x()/(p.y()-infinity)-distance(t),
+					(1-p.y())/(p.y()-infinity)));
+		}
+		if (p.y() < -infinity) {
+			return floor.at(t, Vector.xy(p.x()/(-infinity-p.y())-distance(t),
+					(p.y()-(-1))/(-infinity-p.y())));
+		}
+
+		return Color.BLACK;
+	}
+	
+}