Create GradientTextureMaker.cs

unitycoder · web-flow · commit 5a3bec2ce2a7 · 2019-03-02T11:12:42.000+02:00
diff --git a/Assets/Scripts/Texture/GradientTextureMaker.cs b/Assets/Scripts/Texture/GradientTextureMaker.cs
@@ -0,0 +1,61 @@
+// returns gradient Texture2D (size=256x1)
+
+using UnityEngine;
+
+namespace UnityLibrary
+{
+    public static class GradientTextureMaker
+    {
+        const int width = 256;
+        const int height = 1;
+
+        public static Texture2D Create(Color[] colors, TextureWrapMode textureWrapMode = TextureWrapMode.Clamp, FilterMode filterMode = FilterMode.Point, bool isLinear = false, bool hasMipMap = false)
+        {
+            if (colors == null || colors.Length == 0)
+            {
+                Debug.LogError("No colors assigned");
+                return null;
+            }
+
+            int length = colors.Length;
+            if (colors.Length > 8)
+            {
+                Debug.LogWarning("Too many colors! maximum is 8, assigned: " + colors.Length);
+                length = 8;
+            }
+
+            // build gradient from colors
+            var colorKeys = new GradientColorKey[length];
+            var alphaKeys = new GradientAlphaKey[length];
+
+            float steps = length - 1f;
+            for (int i = 0; i < length; i++)
+            {
+                float step = i / steps;
+                colorKeys[i].color = colors[i];
+                colorKeys[i].time = step;
+                alphaKeys[i].alpha = colors[i].a;
+                alphaKeys[i].time = step;
+            }
+
+            // create gradient
+            Gradient gradient = new Gradient();
+            gradient.SetKeys(colorKeys, alphaKeys);
+
+            // create texture
+            Texture2D outputTex = new Texture2D(width, height, TextureFormat.ARGB32, false, isLinear);
+            outputTex.wrapMode = textureWrapMode;
+            outputTex.filterMode = filterMode;
+
+            // draw texture
+            for (int i = 0; i < width; i++)
+            {
+                outputTex.SetPixel(i, 0, gradient.Evaluate((float)i / (float)width));
+            }
+            outputTex.Apply(false);
+
+            return outputTex;
+        } // BuildGradientTexture
+
+    } // class
+} // namespcae
