static function DrawTextureAlpha (position : Rect, image : Texture, scaleMode : ScaleMode = ScaleMode.StretchToFill, imageAspect : float = 0) : void

Parameters

Description

Draws the alpha channel of a texture within a rectangle.

See Also: GUI.color, GUI.contentColor

Alpha texture in an Editor Window.

    // Load a texture, display the texture, display its alpha channel and
    // show a preview of the inverted texture
    
    class EditorGUITextures extends EditorWindow {
    
        var texture : Texture2D;
        var invertedTexture : Texture2D;
        var showInverted = false;
        
        @MenuItem("Examples/Texture Previewer")
        static function Init() {
            var window = GetWindow(EditorGUITextures);
            window.position = Rect(0,0,400, 200);
            window.Show();
        }
        
        function OnGUI() {
            texture = EditorGUI.ObjectField(Rect(3,3,200,20),
                    "Add a Texture:",
                    texture,
                    Texture);
            if(GUI.Button(Rect(208,3, position.width - 210, 20),"Process Inverted")) {
                if(invertedTexture)
                    DestroyImmediate(invertedTexture);
                //Copy the new texture
                invertedTexture = new Texture2D(texture.width, 
                        texture.height, 
                        texture.format, 
                        (texture.mipmapCount != 0));
                for (var m : int  = 0; m < texture.mipmapCount; m++) 
                    invertedTexture.SetPixels(texture.GetPixels(m), m);
                InvertColors();
                showInverted = true;
            }
            if(texture) {
                EditorGUI.PrefixLabel(Rect(25,45,100,15),0,GUIContent("Preview:"));
                EditorGUI.DrawPreviewTexture(Rect(25,60,100,100),texture);
                EditorGUI.PrefixLabel(Rect(150,45,100,15),0,GUIContent("Alpha:"));
                EditorGUI.DrawTextureAlpha(Rect(150,60,100,100),texture);
                EditorGUI.PrefixLabel(Rect(275,45,100,15),0,GUIContent("Inverted:"));
                if(showInverted)
                    EditorGUI.DrawPreviewTexture(Rect(275,60,100,100),invertedTexture);
                if(GUI.Button(Rect(3,position.height - 25, position.width-6,20),"Clear texture")) {
                    texture = EditorGUIUtility.whiteTexture;
                    showInverted = false;
                }
            } else {
                EditorGUI.PrefixLabel(
                    Rect(3,position.height - 25,position.width - 6, 20),
                    0,
                    GUIContent("No texture found"));
            }
        }
        
        function InvertColors() { 
            for (var m : int  = 0; m < invertedTexture.mipmapCount; m++) {
                var c : Color[] = invertedTexture.GetPixels(m);
                for (var i : int = 0 ;i < c.Length; i++) {
                    c[i].r = 1 - c[i].r;
                    c[i].g = 1 - c[i].g;
                    c[i].b = 1 - c[i].b;
                }
                invertedTexture.SetPixels(c, m); 
            }
            invertedTexture.Apply();
        }
        function OnInspectorUpdate() {
            Repaint();
        }
    }