xref: /frameworks/base/graphics/java/android/graphics/drawable/shapes/ArcShape.java

/*
 * Copyright (C) 2007 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.drawable.shapes;

import android.graphics.Canvas;
import android.graphics.Outline;
import android.graphics.Paint;

/**
 * Creates an arc shape. The arc shape starts at a specified
 * angle and sweeps clockwise, drawing slices of pie.
 * The arc can be drawn to a Canvas with its own draw() method,
 * but more graphical control is available if you instead pass
 * the ArcShape to a {@link android.graphics.drawable.ShapeDrawable}.
 */
public class ArcShape extends RectShape {
    private float mStart;
    private float mSweep;

    /**
     * ArcShape constructor.
     *
     * @param startAngle the angle (in degrees) where the arc begins
     * @param sweepAngle the sweep angle (in degrees). Anything equal to or
     *                   greater than 360 results in a complete circle/oval.
     */
    public ArcShape(float startAngle, float sweepAngle) {
        mStart = startAngle;
        mSweep = sweepAngle;
    }

    @Override
    public void draw(Canvas canvas, Paint paint) {
        canvas.drawArc(rect(), mStart, mSweep, true, paint);
    }

    @Override
    public void getOutline(Outline outline) {
        // Since we don't support concave outlines, arc shape does not attempt
        // to provide an outline.
    }
}