| /* |
| * 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 android.graphics.cts; |
| |
| import static org.junit.Assert.assertEquals; |
| import static org.junit.Assert.assertTrue; |
| |
| import android.graphics.Bitmap; |
| import android.graphics.Bitmap.Config; |
| import android.graphics.Canvas; |
| import android.graphics.Color; |
| import android.graphics.LinearGradient; |
| import android.graphics.Matrix; |
| import android.graphics.Paint; |
| import android.graphics.Shader.TileMode; |
| import android.support.test.filters.SmallTest; |
| import android.support.test.runner.AndroidJUnit4; |
| |
| import com.android.compatibility.common.util.ColorUtils; |
| |
| import org.junit.Test; |
| import org.junit.runner.RunWith; |
| |
| @SmallTest |
| @RunWith(AndroidJUnit4.class) |
| public class LinearGradientTest { |
| @Test |
| public void testLinearGradient() { |
| Bitmap b; |
| LinearGradient lg; |
| int[] color = { Color.BLUE, Color.GREEN, Color.RED }; |
| float[] position = { 0.0f, 1.0f / 3.0f, 2.0f / 3.0f }; |
| |
| lg = new LinearGradient(0, 0, 0, 40, color, position, TileMode.CLAMP); |
| b = drawLinearGradient(lg); |
| |
| // The pixels in same gradient line should be equivalent |
| assertEquals(b.getPixel(10, 10), b.getPixel(20, 10)); |
| // BLUE -> GREEN, B sub-value decreasing while G sub-value increasing |
| assertTrue(Color.blue(b.getPixel(10, 0)) > Color.blue(b.getPixel(10, 5))); |
| assertTrue(Color.blue(b.getPixel(10, 5)) > Color.blue(b.getPixel(10, 10))); |
| assertTrue(Color.green(b.getPixel(10, 0)) < Color.green(b.getPixel(10, 5))); |
| assertTrue(Color.green(b.getPixel(10, 5)) < Color.green(b.getPixel(10, 10))); |
| // GREEN -> RED, G sub-value decreasing while R sub-value increasing |
| assertTrue(Color.green(b.getPixel(10, 15)) > Color.green(b.getPixel(10, 20))); |
| assertTrue(Color.green(b.getPixel(10, 20)) > Color.green(b.getPixel(10, 25))); |
| assertTrue(Color.red(b.getPixel(10, 15)) < Color.red(b.getPixel(10, 20))); |
| assertTrue(Color.red(b.getPixel(10, 20)) < Color.red(b.getPixel(10, 25))); |
| |
| lg = new LinearGradient(0, 0, 0, 40, Color.RED, Color.BLUE, TileMode.CLAMP); |
| b = drawLinearGradient(lg); |
| |
| // The pixels in same gradient line should be equivalent |
| assertEquals(b.getPixel(10, 10), b.getPixel(20, 10)); |
| // RED -> BLUE, R sub-value decreasing while B sub-value increasing |
| assertTrue(Color.red(b.getPixel(10, 0)) > Color.red(b.getPixel(10, 15))); |
| assertTrue(Color.red(b.getPixel(10, 15)) > Color.red(b.getPixel(10, 30))); |
| assertTrue(Color.blue(b.getPixel(10, 0)) < Color.blue(b.getPixel(10, 15))); |
| assertTrue(Color.blue(b.getPixel(10, 15)) < Color.blue(b.getPixel(10, 30))); |
| } |
| |
| private Bitmap drawLinearGradient(LinearGradient lg) { |
| Paint paint = new Paint(); |
| paint.setShader(lg); |
| Bitmap b = Bitmap.createBitmap(40, 40, Config.ARGB_8888); |
| b.eraseColor(Color.BLACK); |
| Canvas canvas = new Canvas(b); |
| canvas.drawPaint(paint); |
| return b; |
| } |
| |
| @Test |
| public void testZeroScaleMatrix() { |
| LinearGradient gradient = new LinearGradient(0.5f, 0, 1.5f, 0, |
| Color.RED, Color.BLUE, TileMode.CLAMP); |
| Matrix m = new Matrix(); |
| m.setScale(0, 0); |
| gradient.setLocalMatrix(m); |
| Bitmap bitmap = drawLinearGradient(gradient); |
| |
| ColorUtils.verifyColor(Color.BLACK, bitmap.getPixel(0, 0), 1); |
| ColorUtils.verifyColor(Color.BLACK, bitmap.getPixel(20, 20), 1); |
| } |
| } |