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 17 package android.graphics.cts; 18 19 import static org.junit.Assert.assertEquals; 20 import static org.junit.Assert.assertTrue; 21 22 import android.graphics.Bitmap; 23 import android.graphics.Bitmap.Config; 24 import android.graphics.Canvas; 25 import android.graphics.Color; 26 import android.graphics.DiscretePathEffect; 27 import android.graphics.Paint; 28 import android.graphics.Paint.Style; 29 import android.graphics.Path; 30 import android.graphics.PorterDuff.Mode; 31 import android.graphics.PorterDuffXfermode; 32 import android.support.test.filters.SmallTest; 33 import android.support.test.runner.AndroidJUnit4; 34 35 import org.junit.Test; 36 import org.junit.runner.RunWith; 37 38 @SmallTest 39 @RunWith(AndroidJUnit4.class) 40 public class DiscretePathEffectTest { 41 private static final int BITMAP_WIDTH = 200; 42 private static final int BITMAP_HEIGHT = 100; 43 private static final int START_X = 10; 44 private static final int END_X = BITMAP_WIDTH - START_X; 45 private static final int COORD_Y = BITMAP_HEIGHT / 2; 46 private static final int SEGMENT_LENGTH = 10; // must be < BITMAP_WIDTH 47 private static final int DEVIATION = 10; // must be < BITMAP_HEIGHT 48 49 @Test testDiscretePathEffect()50 public void testDiscretePathEffect() { 51 DiscretePathEffect effect = new DiscretePathEffect(SEGMENT_LENGTH, DEVIATION); 52 53 Paint paint = new Paint(); 54 paint.setColor(Color.GREEN); 55 paint.setStyle(Style.STROKE); 56 paint.setStrokeWidth(0); 57 paint.setPathEffect(effect); 58 59 Path path = new Path(); 60 path.moveTo(START_X, COORD_Y); 61 path.lineTo(END_X, COORD_Y); 62 63 Bitmap bitmap = Bitmap.createBitmap(BITMAP_WIDTH, BITMAP_HEIGHT, Config.ARGB_8888); 64 bitmap.eraseColor(Color.TRANSPARENT); 65 66 Canvas canvas = new Canvas(bitmap); 67 canvas.drawPath(path, paint); 68 69 // draw guide line into red channel (each segment should cross this once) 70 paint = new Paint(); 71 paint.setColor(Color.RED); 72 paint.setStyle(Style.STROKE); 73 paint.setStrokeWidth(0); 74 paint.setXfermode(new PorterDuffXfermode(Mode.SCREEN)); 75 canvas.drawPath(path, paint); 76 77 // draw guide rectangle into blue channel (each segment must be completely inside this) 78 paint.setColor(Color.BLUE); 79 paint.setStrokeWidth(1 + 2 * DEVIATION); 80 canvas.drawPath(path, paint); 81 82 int intersect = 0; 83 int numGreenPixels = 0; 84 int minY = BITMAP_HEIGHT; 85 int maxY = 0; 86 for (int y = 0; y < BITMAP_HEIGHT; y++) { 87 for (int x = 0; x < BITMAP_WIDTH; x++) { 88 int pixel = bitmap.getPixel(x, y); 89 if (Color.green(pixel) > 0) { 90 numGreenPixels += 1; 91 minY = Math.min(minY, y); 92 maxY = Math.max(maxY, y); 93 assertEquals(0xFF, Color.blue(pixel)); 94 if (Color.red(pixel) > 0) { 95 intersect += 1; 96 } 97 } 98 } 99 } 100 int lineLength = END_X - START_X; 101 // the number of pixels in all segments must be at least the same as the line length 102 assertTrue(numGreenPixels >= lineLength); 103 // green line must vary in y direction 104 assertTrue(maxY - minY > 0); 105 // ... but not too much 106 assertTrue(maxY - minY <= 1 + 2 * DEVIATION); 107 // intersecting pixels must be less than line length, otherwise deviation doesn't work 108 assertTrue(intersect < lineLength); 109 // there must be at least as many intersecting pixels as there are full segments 110 assertTrue(intersect >= lineLength / SEGMENT_LENGTH); 111 } 112 } 113