//
// CliperView.m
// newPictureShearTool
//
// Created by mini on 2017/1/3.
// Copyright © 2017年 mini. All rights reserved.
//

import "CliperView.h"

@interface CliperView ()

@property(assign,nonatomic) CGRect cliprect;

@property(assign,nonatomic) CGPoint touchPoint;

@property(strong,nonatomic) UIImageView *imageView;

@property(assign,nonatomic) CGColorRef grayAlpha;
@end

@implementation CliperView

• (id)initWithFrame:(CGRect)frame
  {
  self = [super initWithFrame:frame];
  return self;
  }
• (id)initWithImageView:(UIImageView*)iv
  {
  CGRect r = [iv bounds];
  self = [super initWithFrame:r];
  if (self) {
  [iv addSubview:self];
  [iv setUserInteractionEnabled:YES];
  [self setBackgroundColor:[UIColor clearColor]];
  //保证出来的是正方形
  float size = r.size.height>r.size.width? r.size.width :r.size.height;
  // 剪切框的位置
  _cliprect = CGRectMake((r.size.width-size)/2, (r.size.height-size)/2, size, size);
  _grayAlpha = [[[UIColor alloc]initWithRed:0 green:0 blue:0 alpha:0.6] CGColor];
  // 只接受单点触摸
  [self setMultipleTouchEnabled:NO];
  _touchPoint = CGPointZero;
  _imageView = iv;
  }
  return self;
  }

/**/
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.

• (void)drawRect:(CGRect)rect
  {
  CGContextRef context=UIGraphicsGetCurrentContext();
  //绘制剪裁区域外半透明效果
  CGContextSetFillColorWithColor(context, [UIColor orangeColor].CGColor);

    CGRect r = CGRectMake(0, 0, rect.size.width, _cliprect.origin.y);
    CGContextFillRect(context, r);
    r = CGRectMake(0, _cliprect.origin.y-0.2, _cliprect.origin.x, _cliprect.size.height);
    CGContextFillRect(context, r);
    r = CGRectMake(_cliprect.origin.x + _cliprect.size.width, _cliprect.origin.y-0.2, rect.size.width - _cliprect.origin.x - _cliprect.size.width, _cliprect.size.height);
    CGContextFillRect(context, r);
    r = CGRectMake(0, _cliprect.origin.y + _cliprect.size.height, rect.size.width, rect.size.height - _cliprect.origin.y - _cliprect.size.height+0.1);
    CGContextFillRect(context, r);
            //绘制剪裁区域的格子
    CGContextSetRGBStrokeColor(context, 1.0f, 1.0f, 1.0f, 0.8f);
    CGContextSetLineWidth(context, 2.0);
    CGContextAddRect(context, _cliprect);
    CGContextMoveToPoint(context, _cliprect.origin.x+_cliprect.size.width/3, _cliprect.origin.y);
    CGContextAddLineToPoint(context, _cliprect.origin.x+_cliprect.size.width/3, _cliprect.origin.y+_cliprect.size.height);
    CGContextMoveToPoint(context, _cliprect.origin.x+_cliprect.size.width/3*2, _cliprect.origin.y);
    CGContextAddLineToPoint(context, _cliprect.origin.x+_cliprect.size.width/3*2, _cliprect.origin.y+_cliprect.size.height);
            //
    CGContextMoveToPoint(context, _cliprect.origin.x, _cliprect.origin.y+_cliprect.size.height/3);
    CGContextAddLineToPoint(context, _cliprect.origin.x+_cliprect.size.width, _cliprect.origin.y+_cliprect.size.height/3);
    CGContextMoveToPoint(context, _cliprect.origin.x, _cliprect.origin.y+_cliprect.size.height/3*2);
    CGContextAddLineToPoint(context, _cliprect.origin.x+_cliprect.size.width, _cliprect.origin.y+_cliprect.size.height/3*2);
    CGContextStrokePath(context);
  

}

• (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
  {
  UITouch *touch = [touches anyObject];
  // 记录点击的起点
  _touchPoint = [touch locationInView:self];
  }

• (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
  {
  UITouch *touch = [touches anyObject];
  CGPoint p = [touch locationInView:self];
  float x1=.0f, x2=.0f, y1=.0f, y2=.0f;
  float x = _touchPoint.x;
  float y = _touchPoint.y;
  if (fabs(x-_cliprect.origin.x)<20) //左
  {
  float offy = y-_cliprect.origin.y;
  if (fabsf(offy)<20) { //左上角
  x1 = p.x - _touchPoint.x;
  y1 = p.y - _touchPoint.y;
  }else if(fabs(offy-_cliprect.size.height)<20){ //左下角
  x1 = p.x - _touchPoint.x;
  y2 = p.y - _touchPoint.y;
  }else if(y>_cliprect.origin.y && y<_cliprect.origin.y+_cliprect.size.height) { //左中部
  x1 = p.x - _touchPoint.x;
  }
  }else if(fabs(x-_cliprect.origin.x-_cliprect.size.width)<20) //右
  {
  float offy = y-_cliprect.origin.y;
  if (fabsf(offy)<20) { //右上角
  x2 = p.x -_touchPoint.x;
  y1 = p.y -_touchPoint.y;
  }else if(fabs(offy-_cliprect.size.height)<20) { //右下角
  x2 = p.x - _touchPoint.x;
  y2 = p.y - _touchPoint.y;
  }else if(y>_cliprect.origin.y && y<_cliprect.origin.y+_cliprect.size.height) { //右中部
  x2 = p.x - _touchPoint.x;
  }
  }else if(fabs(y-_cliprect.origin.y)<20){ //上
  if (x>_cliprect.origin.x && x< _cliprect.size.width) { //上中
  y1 = p.y - _touchPoint.y;
  }
  }else if(fabs(y-_cliprect.origin.y-_cliprect.size.height)<20){ //下
  if (x>_cliprect.origin.x && x< _cliprect.size.width) { //下中
  y2 = p.y - _touchPoint.y;
  }
  }else if((x>_cliprect.origin.x && x< _cliprect.origin.x+_cliprect.size.width)&&(y>_cliprect.origin.y && y<_cliprect.origin.y+_cliprect.size.height)){ //正中
  _cliprect.origin.x += (p.x -_touchPoint.x);
  _cliprect.origin.y += (p.y -_touchPoint.y);
  if (_cliprect.origin.x<0) {
  _cliprect.origin.x=0;
  }else if(_cliprect.origin.x>self.bounds.size.width-_cliprect.size.width)
  {
  _cliprect.origin.x=self.bounds.size.width-_cliprect.size.width;
  }
  if (_cliprect.origin.y<0) {
  _cliprect.origin.y=0;
  }else if(_cliprect.origin.y>self.bounds.size.height-_cliprect.size.height)
  {
  _cliprect.origin.y=self.bounds.size.height-_cliprect.size.height;
  }
  }else {
  return;
  }
  //修改rect
  [self ChangeclipEDGE:x1 x2:x2 y1:y1 y2:y2];
  [self setNeedsDisplay];

    _touchPoint = p;
  

}

    //休整剪切区域

• (CGRect)ChangeclipEDGE:(float)x1 x2:(float)x2 y1:(float)y1 y2:(float)y2
  {
  _cliprect.origin.x += x1;
  _cliprect.size.width -= x1;
  _cliprect.origin.y += y1;
  _cliprect.size.height -= y1;
  _cliprect.size.width += x2;
  _cliprect.size.height += y2;
  if (_cliprect.size.width<60) {
  if (x1>0.f) {
  _cliprect.origin.x -= 60.0 - _cliprect.size.width;
  }
  _cliprect.size.width = 60;
  }else if(_cliprect.size.height<60) {
  if (y1>0.f) {
  _cliprect.origin.y -= 60.0 - _cliprect.size.height;
  }
  _cliprect.size.height = 60;
  }
  return _cliprect;
  }

• (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
  {
  _touchPoint = CGPointZero;
  [self setNeedsDisplay];

}

• (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event
  {
  [self touchesEnded:touches withEvent:event];
  }

• (void)setclipEDGE:(CGRect)rect
  {
  _cliprect = rect;
  [self setNeedsDisplay];
  }

• (CGRect)getclipRect
  {
  [self ChangeclipEDGE:0 x2:0 y1:0 y2:0];
  [self setNeedsDisplay];
  float imgsize = [_imageView image].size.width;
  float viewsize = [_imageView frame].size.width;
  float scale = imgsize/viewsize;
  CGRect r = CGRectMake(_cliprect.origin.xscale, _cliprect.origin.yscale, _cliprect.size.widthscale, _cliprect.size.heightscale);
  return r;
  }

-(void)setClipRect:(CGRect)rect
{
_cliprect = rect;
[self setNeedsDisplay];
}

-(UIImage*)getClipImageRect:(CGRect)rect
{
CGImageRef imgrefout = CGImageCreateWithImageInRect([_imageView.image CGImage], rect);
UIImage *img_ret = [[UIImage alloc]initWithCGImage:imgrefout];
return img_ret;
}

@end