com/android/systemui/recents/TriangleShape.java

/*
 * Copyright (C) 2018 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.android.systemui.recents;

import android.graphics.Outline;
import android.graphics.Path;
import android.graphics.drawable.shapes.PathShape;

import androidx.annotation.NonNull;

/**
 * Wrapper around {@link android.graphics.drawable.shapes.PathShape}
 * that creates a shape with a triangular path (pointing up or down).
 */
public class TriangleShape extends PathShape {
    private Path mTriangularPath;

    public TriangleShape(Path path, float stdWidth, float stdHeight) {
        super(path, stdWidth, stdHeight);
        mTriangularPath = path;
    }

    public static TriangleShape create(float width, float height, boolean isPointingUp) {
        Path triangularPath = new Path();
        if (isPointingUp) {
            triangularPath.moveTo(0, height);
            triangularPath.lineTo(width, height);
            triangularPath.lineTo(width / 2, 0);
            triangularPath.close();
        } else {
            triangularPath.moveTo(0, 0);
            triangularPath.lineTo(width / 2, height);
            triangularPath.lineTo(width, 0);
            triangularPath.close();
        }
        return new TriangleShape(triangularPath, width, height);
    }

    /** Create an arrow TriangleShape that points to the left or the right */
    public static TriangleShape createHorizontal(
            float width, float height, boolean isPointingLeft) {
        Path triangularPath = new Path();
        if (isPointingLeft) {
            triangularPath.moveTo(0, height / 2);
            triangularPath.lineTo(width, height);
            triangularPath.lineTo(width, 0);
            triangularPath.close();
        } else {
            triangularPath.moveTo(0, height);
            triangularPath.lineTo(width, height / 2);
            triangularPath.lineTo(0, 0);
            triangularPath.close();
        }
        return new TriangleShape(triangularPath, width, height);
    }

    @Override
    public void getOutline(@NonNull Outline outline) {
        outline.setPath(mTriangularPath);
    }
}