1 /* 2 * Copyright (C) 2009 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 package android.graphics.cts; 17 18 import static org.junit.Assert.assertEquals; 19 import static org.junit.Assert.assertTrue; 20 21 import android.graphics.Bitmap; 22 import android.graphics.Bitmap.Config; 23 import android.graphics.Canvas; 24 import android.graphics.Color; 25 import android.graphics.CornerPathEffect; 26 import android.graphics.Paint; 27 import android.graphics.Paint.Style; 28 import android.graphics.Path; 29 import android.graphics.PathEffect; 30 import android.graphics.PorterDuff.Mode; 31 import android.graphics.PorterDuffXfermode; 32 import android.graphics.RectF; 33 import android.support.test.filters.SmallTest; 34 import android.support.test.runner.AndroidJUnit4; 35 36 import org.junit.Test; 37 import org.junit.runner.RunWith; 38 39 @SmallTest 40 @RunWith(AndroidJUnit4.class) 41 public class CornerPathEffectTest { 42 private static final int BITMAP_WIDTH = 100; 43 private static final int BITMAP_HEIGHT = 100; 44 private static final int PADDING = 10; 45 private static final int RADIUS = 20; 46 private static final int TOLERANCE = 5; 47 48 @Test 49 public void testCornerPathEffect() { 50 Path path = new Path(); 51 path.moveTo(0, PADDING); 52 path.lineTo(BITMAP_WIDTH - PADDING, PADDING); 53 path.lineTo(BITMAP_WIDTH - PADDING, BITMAP_HEIGHT); 54 55 PathEffect effect = new CornerPathEffect(RADIUS); 56 57 Paint pathPaint = new Paint(); 58 pathPaint.setColor(Color.GREEN); 59 pathPaint.setStyle(Style.STROKE); 60 pathPaint.setStrokeWidth(0); 61 pathPaint.setPathEffect(effect); 62 63 Bitmap bitmap = Bitmap.createBitmap(BITMAP_WIDTH, BITMAP_HEIGHT, Config.ARGB_8888); 64 Canvas canvas = new Canvas(bitmap); 65 66 // draw the path using the corner path effect 67 canvas.drawPath(path, pathPaint); 68 69 // create a path that describes the expected shape after the corner is rounded 70 Path expectedPath = new Path(); 71 RectF oval = new RectF(BITMAP_WIDTH - PADDING - 2 * RADIUS, PADDING, 72 BITMAP_WIDTH - PADDING, PADDING + 2 * RADIUS); 73 expectedPath.moveTo(0, PADDING); 74 expectedPath.arcTo(oval, 270, 90); 75 expectedPath.lineTo(BITMAP_WIDTH - PADDING, BITMAP_HEIGHT); 76 77 // A paint that draws the expected path with a tolerance width into the red channel 78 Paint expectedPaint = new Paint(); 79 expectedPaint.setColor(Color.RED); 80 expectedPaint.setStyle(Style.STROKE); 81 expectedPaint.setStrokeWidth(TOLERANCE); 82 expectedPaint.setXfermode(new PorterDuffXfermode(Mode.SCREEN)); 83 84 canvas.drawPath(expectedPath, expectedPaint); 85 86 int numPixels = 0; 87 for (int y = 0; y < BITMAP_HEIGHT; y++) { 88 for (int x = 0; x < BITMAP_WIDTH; x++) { 89 int pixel = bitmap.getPixel(x, y); 90 if (Color.green(pixel) > 0) { 91 numPixels += 1; 92 // green path must overlap with red guide line 93 assertEquals(Color.YELLOW, pixel); 94 } 95 } 96 } 97 // number of pixels that should be on a straight line 98 int straightLines = BITMAP_WIDTH - PADDING - RADIUS + BITMAP_HEIGHT - PADDING - RADIUS; 99 // number of pixels forming the corner 100 int cornerPixels = numPixels - straightLines; 101 // rounded corner must have less pixels than a sharp corner 102 assertTrue(cornerPixels < 2 * RADIUS); 103 // ... but not as few as a diagonal 104 assertTrue(cornerPixels > Math.sqrt(2 * Math.pow(RADIUS, 2))); 105 } 106 } 107
