a1843415aa
2D canvas DrawVertex to create a vector graphic background touch & keypad playable landscape & portrait for all known device sizes. All measurements in DP and nicely scaling. using xml drawables to rotate "dpad" arrow Change-Id: I995acaaf0935c13c03fcbcf974ce5af06f46780e
91 lines
2.9 KiB
Java
Executable File
91 lines
2.9 KiB
Java
Executable File
/*
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* Copyright (C) 2012 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.example.android.snake;
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import android.content.Context;
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import android.content.res.TypedArray;
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import android.graphics.Canvas;
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import android.graphics.Color;
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import android.graphics.Paint;
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import android.util.AttributeSet;
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import android.view.View;
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import java.util.Arrays;
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/**
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* Background View: Draw 4 full-screen RGBY triangles
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*/
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public class BackgroundView extends View {
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private int[] mColors = new int[4];
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private final short[] mIndices =
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{ 0, 1, 2, 0, 3, 4, 0, 1, 4 // Corner points for triangles (with offset = 2)
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};
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private float[] mVertexPoints = null;
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public BackgroundView(Context context, AttributeSet attrs) {
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super(context, attrs);
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setFocusable(true);
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// retrieve colors for 4 segments from styleable properties
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TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.BackgroundView);
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mColors[0] = a.getColor(R.styleable.BackgroundView_colorSegmentOne, Color.RED);
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mColors[1] = a.getColor(R.styleable.BackgroundView_colorSegmentTwo, Color.YELLOW);
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mColors[2] = a.getColor(R.styleable.BackgroundView_colorSegmentThree, Color.BLUE);
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mColors[3] = a.getColor(R.styleable.BackgroundView_colorSegmentFour, Color.GREEN);
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a.recycle();
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}
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@Override
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protected void onDraw(Canvas canvas) {
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assert(mVertexPoints != null);
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// Colors for each vertex
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int[] mFillColors = new int[mVertexPoints.length];
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for (int triangle = 0; triangle < mColors.length; triangle++) {
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// Set color for all vertex points to current triangle color
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Arrays.fill(mFillColors, mColors[triangle]);
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// Draw one triangle
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canvas.drawVertices(Canvas.VertexMode.TRIANGLES, mVertexPoints.length, mVertexPoints,
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0, null, 0, // No Textures
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mFillColors, 0, mIndices,
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triangle * 2, 3, // Use 3 vertices via Index Array with offset 2
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new Paint());
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}
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}
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@Override
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protected void onSizeChanged(int w, int h, int oldw, int oldh) {
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super.onSizeChanged(w, h, oldw, oldh);
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// Construct our center and four corners
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mVertexPoints = new float[] {
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w / 2, h / 2,
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0, 0,
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w, 0,
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w, h,
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0, h
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};
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}
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}
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