BookPageView.java 文件源码

/**
 * 绘制A区域左阴影
 * @param canvas
 */
private void drawPathALeftShadow(Canvas canvas, Path pathA){
    canvas.restore();
    canvas.save();

    int left;
    int right;
    int top = (int) e.y;
    int bottom = (int) (e.y+viewHeight);

    GradientDrawable gradientDrawable;
    if (style.equals(STYLE_TOP_RIGHT)) {
        gradientDrawable = drawableLeftTopRight;
        left = (int) (e.x - lPathAShadowDis /2);
        right = (int) (e.x);
    } else {
        gradientDrawable = drawableLeftLowerRight;
        left = (int) (e.x);
        right = (int) (e.x + lPathAShadowDis /2);
    }

    Path mPath = new Path();
    mPath.moveTo(a.x- Math.max(rPathAShadowDis, lPathAShadowDis) /2,a.y);
    mPath.lineTo(d.x,d.y);
    mPath.lineTo(e.x,e.y);
    mPath.lineTo(a.x,a.y);
    mPath.close();
    canvas.clipPath(pathA);
    canvas.clipPath(mPath, Region.Op.INTERSECT);

    float mDegrees = (float) Math.toDegrees(Math.atan2(e.x-a.x, a.y-e.y));
    canvas.rotate(mDegrees, e.x, e.y);

    gradientDrawable.setBounds(left,top,right,bottom);
    gradientDrawable.draw(canvas);
}