[client] Simplify ListTable interfaces, add util class for color handling

1 files changed, 59 insertions, 0 deletions

diff --git a/dozentenmodul/src/main/java/org/openslx/dozmod/gui/helper/ColorUtil.java b/dozentenmodul/src/main/java/org/openslx/dozmod/gui/helper/ColorUtil.java
new file mode 100644
index 00000000..6b30a8cd
--- /dev/null
+++ b/dozentenmodul/src/main/java/org/openslx/dozmod/gui/helper/ColorUtil.java
@@ -0,0 +1,59 @@
+package org.openslx.dozmod.gui.helper;
+
+import java.awt.Color;
+
+public class ColorUtil {
+
+	private static float[] squared(Color color) {
+		float[] vals = color.getRGBComponents(null);
+		vals[0] *= vals[0];
+		vals[1] *= vals[1];
+		vals[2] *= vals[2];
+		return vals;
+	}
+
+	private static Color sqrt(float... floatVals) {
+		floatVals[0] = (float) Math.sqrt(floatVals[0]);
+		floatVals[1] = (float) Math.sqrt(floatVals[1]);
+		floatVals[2] = (float) Math.sqrt(floatVals[2]);
+		return new Color(floatVals[0], floatVals[1], floatVals[2]);
+	}
+
+	public static Color blendFast(Color color1, Color color2, float wc1) {
+		float[] c1 = color1.getColorComponents(null);
+		float[] c2 = color2.getColorComponents(null);
+		float wc2 = 1f - wc1;
+		return new Color(c1[0] * wc1 + c2[0] * wc2, c1[1] * wc1 + c2[1] * wc2, c1[2] * wc1 + c2[2] * wc2);
+	}
+
+	public static Color blend(Color color1, Color color2, float wc1) {
+		float[] c1 = squared(color1);
+		float[] c2 = squared(color2);
+		float wc2 = 1f - wc1;
+		return sqrt(c1[0] * wc1 + c2[0] * wc2, c1[1] * wc1 + c2[1] * wc2, c1[2] * wc1 + c2[2] * wc2);
+	}
+
+	public static Color add(Color color1, Color color2, float wc1) {
+		float[] c1 = squared(color1);
+		float[] c2 = squared(color2);
+		c1[0] += c2[0];
+		c1[1] += c2[1];
+		c1[2] += c2[2];
+		float max = Math.max(Math.max(c1[0], c1[1]), c1[2]);
+		if (max > 1f) {
+			c1[0] /= max;
+			c1[1] /= max;
+			c1[2] /= max;
+		}
+		return sqrt(c1[0], c1[1], c1[2]);
+	}
+
+	public static float getBrightness(Color color) {
+		return Color.RGBtoHSB(color.getRed(), color.getBlue(), color.getGreen(), null)[2];
+	}
+
+	public static Color contrastColor(Color color) {
+		return new Color(color.getRed() ^ 0x80, color.getGreen() ^ 0x80, color.getBlue() ^ 0x80);
+	}
+
+}