| /* |
| * Copyright (C) 2008 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.apis.graphics; |
| |
| import com.example.android.apis.R; |
| |
| import android.content.Context; |
| import android.graphics.*; |
| import android.os.Bundle; |
| import android.view.*; |
| |
| public class Vertices extends GraphicsActivity { |
| |
| @Override |
| protected void onCreate(Bundle savedInstanceState) { |
| super.onCreate(savedInstanceState); |
| setContentView(new SampleView(this)); |
| } |
| |
| private static class SampleView extends View { |
| private final Paint mPaint = new Paint(); |
| private final float[] mVerts = new float[10]; |
| private final float[] mTexs = new float[10]; |
| private final short[] mIndices = { 0, 1, 2, 3, 4, 1 }; |
| |
| private final Matrix mMatrix = new Matrix(); |
| private final Matrix mInverse = new Matrix(); |
| |
| private static void setXY(float[] array, int index, float x, float y) { |
| array[index*2 + 0] = x; |
| array[index*2 + 1] = y; |
| } |
| |
| public SampleView(Context context) { |
| super(context); |
| setFocusable(true); |
| |
| Bitmap bm = BitmapFactory.decodeResource(getResources(), |
| R.drawable.beach); |
| Shader s = new BitmapShader(bm, Shader.TileMode.CLAMP, |
| Shader.TileMode.CLAMP); |
| mPaint.setShader(s); |
| |
| float w = bm.getWidth(); |
| float h = bm.getHeight(); |
| // construct our mesh |
| setXY(mTexs, 0, w/2, h/2); |
| setXY(mTexs, 1, 0, 0); |
| setXY(mTexs, 2, w, 0); |
| setXY(mTexs, 3, w, h); |
| setXY(mTexs, 4, 0, h); |
| |
| setXY(mVerts, 0, w/2, h/2); |
| setXY(mVerts, 1, 0, 0); |
| setXY(mVerts, 2, w, 0); |
| setXY(mVerts, 3, w, h); |
| setXY(mVerts, 4, 0, h); |
| |
| mMatrix.setScale(0.8f, 0.8f); |
| mMatrix.preTranslate(20, 20); |
| mMatrix.invert(mInverse); |
| } |
| |
| @Override protected void onDraw(Canvas canvas) { |
| canvas.drawColor(0xFFCCCCCC); |
| canvas.save(); |
| canvas.concat(mMatrix); |
| |
| canvas.drawVertices(Canvas.VertexMode.TRIANGLE_FAN, 10, mVerts, 0, |
| mTexs, 0, null, 0, null, 0, 0, mPaint); |
| |
| canvas.translate(0, 240); |
| canvas.drawVertices(Canvas.VertexMode.TRIANGLE_FAN, 10, mVerts, 0, |
| mTexs, 0, null, 0, mIndices, 0, 6, mPaint); |
| |
| canvas.restore(); |
| } |
| |
| @Override public boolean onTouchEvent(MotionEvent event) { |
| float[] pt = { event.getX(), event.getY() }; |
| mInverse.mapPoints(pt); |
| setXY(mVerts, 0, pt[0], pt[1]); |
| invalidate(); |
| return true; |
| } |
| |
| } |
| } |
| |