/*
 * Copyright (C) 2016 Peng fei Pan <sky@xiaopan.me>
 *
 * 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 me.xiaopan.sketch.shaper;

import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.Rect;

import me.xiaopan.sketch.request.ShapeSize;

/**
 * 圆形的图片整型器，还可以有描边
 */
public class CircleImageShaper implements ImageShaper {
    private int strokeWidth;
    private int strokeColor;

    private Paint strokePaint;

    @SuppressWarnings("unused")
    public int getStrokeColor() {
        return strokeColor;
    }

    @SuppressWarnings("unused")
    public CircleImageShaper setStroke(int strokeColor, int strokeWidth) {
        this.strokeColor = strokeColor;
        this.strokeWidth = strokeWidth;
        updatePaint();
        return this;
    }

    @SuppressWarnings("unused")
    public int getStrokeWidth() {
        return strokeWidth;
    }

    private void updatePaint() {
        if (strokeColor != 0 && strokeWidth > 0) {
            if (strokePaint == null) {
                strokePaint = new Paint();
                strokePaint.setStyle(Paint.Style.STROKE);
                strokePaint.setAntiAlias(true);
            }

            strokePaint.setColor(strokeColor);
            strokePaint.setStrokeWidth(strokeWidth);
        }
    }

    @Override
    public void onUpdateShaderMatrix(Matrix matrix, Rect bounds, int bitmapWidth, int bitmapHeight,
                                     ShapeSize shapeSize, Rect srcRect) {

    }

    @Override
    public void draw(Canvas canvas, Paint paint, Rect bounds) {
        final float widthRadius = bounds.width() / 2f;
        final float heightRadius = bounds.height() / 2f;
        final float cx = bounds.left + widthRadius;
        final float cy = bounds.top + heightRadius;
        final float radius = Math.min(widthRadius, heightRadius);

        paint.setAntiAlias(true);
        canvas.drawCircle(cx, cy, radius, paint);

        if (strokeColor != 0 && strokeWidth > 0 && strokePaint != null) {
            // 假如描边宽度是10，那么会是5个像素在图片外面，5哥像素在图片里面，
            // 所以往图片里面偏移描边宽度的一半，让描边都在图片里面
            final float offset = strokeWidth / 2f;
            canvas.drawCircle(cx, cy, radius - offset, strokePaint);
        }
    }
}