tests/tests/graphics/src/android/graphics/cts/PathDashPathEffectTest.java

/*
 * 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 android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.Path.Direction;
import android.graphics.PathDashPathEffect;
import android.graphics.RectF;
import android.support.test.filters.SmallTest;
import android.support.test.runner.AndroidJUnit4;

import org.junit.Test;
import org.junit.runner.RunWith;

@SmallTest
@RunWith(AndroidJUnit4.class)
public class PathDashPathEffectTest {
    private static final int SQUARE = 10;
    private static final int ADVANCE = 30;
    private static final int WIDTH = 100;
    private static final int HEIGHT = 100;

    @Test
    public void testPathDashPathEffect() {
        Bitmap b = Bitmap.createBitmap(WIDTH, HEIGHT, Config.ARGB_8888);
        b.eraseColor(Color.BLACK);
        PathDashPathEffect effect = new PathDashPathEffect(shape(), ADVANCE, 0,
                PathDashPathEffect.Style.TRANSLATE);
        Canvas canvas = new Canvas(b);
        Paint p = new Paint();
        p.setPathEffect(effect);
        p.setColor(Color.RED);
        canvas.drawPath(path(), p);

        Bitmap expected = Bitmap.createBitmap(WIDTH, HEIGHT, Config.ARGB_8888);
        expected.eraseColor(Color.BLACK);
        canvas = new Canvas(expected);
        p = new Paint();
        p.setColor(Color.RED);
        RectF rect = new RectF(0, HEIGHT / 2 - SQUARE, 0, HEIGHT / 2 + SQUARE);
        for (int i = 0; i <= WIDTH + SQUARE; i += ADVANCE) {
            rect.left = i - SQUARE;
            rect.right = i + SQUARE;
            canvas.drawRect(rect, p);
        }

        int diffCount = 0;
        for (int y = 0; y < HEIGHT; y++) {
            for (int x = 0; x < WIDTH; x++) {
                if (expected.getPixel(x, y) != b.getPixel(x, y)) {
                    diffCount += 1;
                }
            }
        }
        assertEquals(0, diffCount);
    }

    private static Path path() {
        Path p = new Path();
        p.moveTo(0, HEIGHT / 2);
        p.lineTo(WIDTH, HEIGHT / 2);
        return p;
    }

    private static Path shape() {
        Path p = new Path();
        p.addRect(new RectF(-SQUARE, -SQUARE, SQUARE, SQUARE), Direction.CCW);
        return p;
    }
}