1 files changed, 90 insertions, 0 deletions
diff --git a/samples/Snake/src/com/example/android/snake/BackgroundView.java b/samples/Snake/src/com/example/android/snake/BackgroundView.java
new file mode 100755
index 000000000..bda571e07
--- /dev/null
+++ b/samples/Snake/src/com/example/android/snake/BackgroundView.java
@@ -0,0 +1,90 @@
+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.example.android.snake;
+
+import android.content.Context;
+import android.content.res.TypedArray;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.Paint;
+import android.util.AttributeSet;
+import android.view.View;
+
+import java.util.Arrays;
+
+/**
+ * Background View: Draw 4 full-screen RGBY triangles
+ */
+public class BackgroundView extends View {
+
+    private int[] mColors = new int[4];
+
+    private final short[] mIndices =
+            { 0, 1, 2, 0, 3, 4, 0, 1, 4 // Corner points for triangles (with offset = 2)
+    };
+
+    private float[] mVertexPoints = null;
+
+    public BackgroundView(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        setFocusable(true);
+
+        // retrieve colors for 4 segments from styleable properties
+        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.BackgroundView);
+        mColors[0] = a.getColor(R.styleable.BackgroundView_colorSegmentOne, Color.RED);
+        mColors[1] = a.getColor(R.styleable.BackgroundView_colorSegmentTwo, Color.YELLOW);
+        mColors[2] = a.getColor(R.styleable.BackgroundView_colorSegmentThree, Color.BLUE);
+        mColors[3] = a.getColor(R.styleable.BackgroundView_colorSegmentFour, Color.GREEN);
+
+        a.recycle();
+    }
+
+    @Override
+    protected void onDraw(Canvas canvas) {
+        assert(mVertexPoints != null);
+
+        // Colors for each vertex
+        int[] mFillColors = new int[mVertexPoints.length];
+
+        for (int triangle = 0; triangle < mColors.length; triangle++) {
+            // Set color for all vertex points to current triangle color
+            Arrays.fill(mFillColors, mColors[triangle]);
+
+            // Draw one triangle
+            canvas.drawVertices(Canvas.VertexMode.TRIANGLES, mVertexPoints.length, mVertexPoints,
+                    0, null, 0, // No Textures
+                    mFillColors, 0, mIndices,
+                    triangle * 2, 3, // Use 3 vertices via Index Array with offset 2
+                    new Paint());
+        }
+    }
+
+    @Override
+    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
+        super.onSizeChanged(w, h, oldw, oldh);
+
+     // Construct our center and four corners
+        mVertexPoints = new float[] {
+                w / 2, h / 2,
+                0, 0,
+                w, 0,
+                w, h,
+                0, h
+        };
+    }
+
+}