一、图片裁剪

//拖动手势

- (void)handlePanGes:(PanGesRec *)panGes
{
    CGPoint translation = [panGes translationInView:self.imgView.superview];
    CGPoint movePoint = panGes.movedPoint;
    
    //判断开始滑动时的滑动对象:top、bottom、left、right
    if (panGes.state == GR_BEGIN) {
        
        //再次开始移动，shaView整体高亮
        [UIView animateWithDuration:0.5 animations:^{
            self.shaView.isSetShadow = NO;
        }];
        
        if ([self judgeGesRecInViewWithMinX:self.clipAreaLayer.leftEdge+SHORT_LINE_LENGTH MaxX:self.clipAreaLayer.rightEdge-SHORT_LINE_LENGTH MinY:self.clipAreaLayer.topEdge-PANGR_OFFET MaxY:self.clipAreaLayer.topEdge+PANGR_OFFET]) {
            self.acGeView = CLIP_AREA_TOP;
        } else if ([self judgeGesRecInViewWithMinX:self.clipAreaLayer.leftEdge+SHORT_LINE_LENGTH MaxX:self.clipAreaLayer.rightEdge-SHORT_LINE_LENGTH MinY:self.clipAreaLayer.bottomEdge-PANGR_OFFET MaxY:self.clipAreaLayer.bottomEdge+PANGR_OFFET]) {
            self.acGeView = CLIP_AREA_BOTTOM;
        } else if ([self judgeGesRecInViewWithMinX:self.clipAreaLayer.leftEdge-PANGR_OFFET MaxX:self.clipAreaLayer.leftEdge+PANGR_OFFET MinY:self.clipAreaLayer.topEdge+SHORT_LINE_LENGTH MaxY:self.clipAreaLayer.bottomEdge-SHORT_LINE_LENGTH]) {
            self.acGeView = CLIP_AREA_LEFT;
        } else if ([self judgeGesRecInViewWithMinX:self.clipAreaLayer.rightEdge-PANGR_OFFET MaxX:self.clipAreaLayer.rightEdge+PANGR_OFFET MinY:self.clipAreaLayer.topEdge+SHORT_LINE_LENGTH MaxY:self.clipAreaLayer.bottomEdge-SHORT_LINE_LENGTH]) {
            self.acGeView = CLIP_AREA_RIGHT;
        } else if ([self judgeGesRecInViewWithMinX:self.clipAreaLayer.leftEdge-PANGR_OFFET MaxX:self.clipAreaLayer.leftEdge+PANGR_OFFET MinY:self.clipAreaLayer.topEdge MaxY:self.clipAreaLayer.topEdge+SHORT_LINE_LENGTH] || [self judgeGesRecInViewWithMinX:self.clipAreaLayer.leftEdge MaxX:self.clipAreaLayer.leftEdge+SHORT_LINE_LENGTH MinY:self.clipAreaLayer.topEdge-PANGR_OFFET MaxY:self.clipAreaLayer.topEdge+PANGR_OFFET]){
            self.acGeView = CLIP_AREA_LT;
        } else if ([self judgeGesRecInViewWithMinX:self.clipAreaLayer.leftEdge-PANGR_OFFET MaxX:self.clipAreaLayer.leftEdge+PANGR_OFFET MinY:self.clipAreaLayer.bottomEdge-SHORT_LINE_LENGTH MaxY:self.clipAreaLayer.bottomEdge] || [self judgeGesRecInViewWithMinX:self.clipAreaLayer.leftEdge MaxX:self.clipAreaLayer.leftEdge+SHORT_LINE_LENGTH MinY:self.clipAreaLayer.bottomEdge-PANGR_OFFET MaxY:self.clipAreaLayer.bottomEdge+PANGR_OFFET]){
            self.acGeView = CLIP_AREA_LB;
        } else if ([self judgeGesRecInViewWithMinX:self.clipAreaLayer.rightEdge-PANGR_OFFET MaxX:self.clipAreaLayer.rightEdge+PANGR_OFFET MinY:self.clipAreaLayer.topEdge MaxY:self.clipAreaLayer.topEdge+SHORT_LINE_LENGTH] || [self judgeGesRecInViewWithMinX:self.clipAreaLayer.rightEdge-SHORT_LINE_LENGTH MaxX:self.clipAreaLayer.rightEdge MinY:self.clipAreaLayer.topEdge-PANGR_OFFET MaxY:self.clipAreaLayer.topEdge+PANGR_OFFET]){
            self.acGeView = CLIP_AREA_RT;
        } else if ([self judgeGesRecInViewWithMinX:self.clipAreaLayer.rightEdge-PANGR_OFFET MaxX:self.clipAreaLayer.rightEdge+PANGR_OFFET MinY:self.clipAreaLayer.bottomEdge-SHORT_LINE_LENGTH MaxY:self.clipAreaLayer.bottomEdge] || [self judgeGesRecInViewWithMinX:self.clipAreaLayer.rightEdge-SHORT_LINE_LENGTH MaxX:self.clipAre