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//
// Scratch and See
//
// The project provides en effect when the user swipes the finger over one texture
// and by swiping reveals the texture underneath it. The effect can be applied for
// scratch-card action or wiping a misted glass.
//
// Copyright (C) 2012 http://moqod.com Andrew Kopanev <andrew@moqod.com>
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
// of the Software, and to permit persons to whom the Software is furnished to do so,
// subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//
#import "MDScratchImageView.h"
#import "MDMatrix.h"
const size_t MDScratchImageViewDefaultRadius = 30;
typedef void (*FillTileWithPointFunc)( id, SEL, CGPoint );
typedef void (*FillTileWithTwoPointsFunc)(id, SEL, CGPoint, CGPoint);
inline CGPoint fromUItoQuartz(CGPoint point, CGSize frameSize){
point.y = frameSize.height - point.y;
return point;
}
inline CGPoint scalePoint(CGPoint point, CGSize previousSize, CGSize currentSize){
return CGPointMake(currentSize.width * point.x / previousSize.width, currentSize.height * point.y / previousSize.height);
}
@interface MDScratchImageView () {
size_t _tilesX;
size_t _tilesY;
int _tilesFilled;
CGColorSpaceRef _colorSpace;
CGContextRef _imageContext;
size_t _radius;
}
@property (nonatomic, strong) MDMatrix *maskedMatrix;
@property (nonatomic, strong) NSMutableArray *touchPoints;
- (UIImage *)addTouches:(NSSet *)touches;
- (void)fillTileWithPoint:(CGPoint)point;
- (void)fillTileWithTwoPoints:(CGPoint)begin end:(CGPoint)end;
@end
@implementation MDScratchImageView
#pragma mark - memory management
- (void)dealloc {
self.maskedMatrix = nil;
if (NULL != _imageContext) {
CGContextRelease(_imageContext);
_imageContext = NULL;
}
if (NULL != _colorSpace) {
CGColorSpaceRelease(_colorSpace);
_colorSpace = NULL;
}
self.touchPoints = nil;
#if !(__has_feature(objc_arc))
[super dealloc];
#endif
}
#pragma mark - inner initalization
- (void)initialize {
self.userInteractionEnabled = YES;
_tilesFilled = 0;
if (nil == self.image) {
_tilesX = _tilesY = 0;
self.maskedMatrix = nil;
if (NULL != _imageContext) {
CGContextRelease(_imageContext);
_imageContext = NULL;
}
if (NULL != _colorSpace) {
CGColorSpaceRelease(_colorSpace);
_colorSpace = NULL;
}
} else {
self.touchPoints = [NSMutableArray array];
// CGSize size = self.image.size;
CGSize size = CGSizeMake(self.image.size.width * self.image.scale, self.image.size.height * self.image.scale);
// initalize bitmap context
if (NULL == _colorSpace) {
_colorSpace = CGColorSpaceCreateDeviceRGB();
}
if (NULL != _imageContext) {
CGContextRelease(_imageContext);
}
_imageContext = CGBitmapContextCreate(0, size.width, size.height, 8, size.width * 4, _colorSpace, kCGImageAlphaPremultipliedLast);
CGContextDrawImage(_imageContext, CGRectMake(0, 0, size.width, size.height), self.image.CGImage);
int blendMode = kCGBlendModeClear;
CGContextSetBlendMode(_imageContext, (CGBlendMode) blendMode);
_tilesX = size.width / (2 * _radius);
_tilesY = size.height / (2 * _radius);
#if !(__has_feature(objc_arc))
self.maskedMatrix = [[[MDMatrix alloc] initWithMax:MDSizeMake(_tilesX, _tilesY)] autorelease];
#else
self.maskedMatrix = [[MDMatrix alloc] initWithMax:MDSizeMake(_tilesX, _tilesY)];
#endif
}
}
#pragma mark -
- (void)setImage:(UIImage *)image radius:(size_t)radius {
[super setImage:image];
_radius = radius;
[self initialize];
}
- (void)setImage:(UIImage *)image {
if (image != self.image) {
[self setImage:image radius:MDScratchImageViewDefaultRadius];
}
}
#pragma mark -
- (CGFloat)maskingProgress {
return ( ((CGFloat)_tilesFilled) / ((CGFloat)(self.maskedMatrix.max.x * self.maskedMatrix.max.y)) );
}
#pragma mark - UIResponder
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
if(!self.image){
return ;
}
[super setImage:[self addTouches:touches]];
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{
if(!self.image){
return ;
}
[super setImage:[self addTouches:touches]];
}
#pragma mark -
-(CGPoint)normalizeVector:(CGPoint)p{
float len = sqrt(p.x*p.x + p.y*p.y);
if(0 == len){return CGPointMake(0, 0);}
p.x /= len;
p.y /= len;
return p;
}
- (UIImage *)addTouches:(NSSet *)touches {
CGSize size = CGSizeMake(self.image.size.width * self.image.scale, self.image.size.height * self.image.scale);
CGContextRef ctx = _imageContext;
CGContextSetFillColorWithColor(ctx,[UIColor clearColor].CGColor);
CGContextSetStrokeColorWithColor(ctx,[UIColor colorWithRed:0 green:0 blue:0 alpha:0].CGColor);
int tempFilled = _tilesFilled;
// process touches
for (UITouch *touch in touches) {
CGContextBeginPath(ctx);
CGPoint touchPoint = [touch locationInView:self];
touchPoint = fromUItoQuartz(touchPoint, self.bounds.size);
touchPoint = scalePoint(touchPoint, self.bounds.size, size);
if(UITouchPhaseBegan == touch.phase){
[self.touchPoints removeAllObjects];
[self.touchPoints addObject:[NSValue valueWithCGPoint:touchPoint]];
[self.touchPoints addObject:[NSValue valueWithCGPoint:touchPoint]];
// on begin, we just draw ellipse
CGRect rect = CGRectMake(touchPoint.x - _radius, touchPoint.y - _radius, _radius*2, _radius*2);
CGContextAddEllipseInRect(ctx, rect);
CGContextFillPath(ctx);
static const FillTileWithPointFunc fillTileFunc = (FillTileWithPointFunc) [self methodForSelector:@selector(fillTileWithPoint:)];
(*fillTileFunc)(self,@selector(fillTileWithPoint:),rect.origin);
} else if (UITouchPhaseMoved == touch.phase) {
[self.touchPoints addObject:[NSValue valueWithCGPoint:touchPoint]];
// then touch moved, we draw superior-width line
CGContextSetStrokeColor(ctx, CGColorGetComponents([UIColor yellowColor].CGColor));
CGContextSetLineCap(ctx, kCGLineCapRound);
CGContextSetLineWidth(ctx, 2 * _radius);
// CGContextMoveToPoint(ctx, prevPoint.x, prevPoint.y);
// CGContextAddLineToPoint(ctx, rect.origin.x, rect.origin.y);
while(self.touchPoints.count > 3){
CGPoint bezier[4];
bezier[0] = ((NSValue*)self.touchPoints[1]).CGPointValue;
bezier[3] = ((NSValue*)self.touchPoints[2]).CGPointValue;
CGFloat k = 0.3;
CGFloat len = sqrt(pow(bezier[3].x - bezier[0].x, 2) + pow(bezier[3].y - bezier[0].y, 2));
bezier[1] = ((NSValue*)self.touchPoints[0]).CGPointValue;
bezier[1] = [self normalizeVector:CGPointMake(bezier[0].x - bezier[1].x - (bezier[0].x - bezier[3].x), bezier[0].y - bezier[1].y - (bezier[0].y - bezier[3].y) )];
bezier[1].x *= len * k;
bezier[1].y *= len * k;
bezier[1].x += bezier[0].x;
bezier[1].y += bezier[0].y;
bezier[2] = ((NSValue*)self.touchPoints[3]).CGPointValue;
bezier[2] = [self normalizeVector:CGPointMake( (bezier[3].x - bezier[2].x) - (bezier[3].x - bezier[0].x), (bezier[3].y - bezier[2].y) - (bezier[3].y - bezier[0].y) )];
bezier[2].x *= len * k;
bezier[2].y *= len * k;
bezier[2].x += bezier[3].x;
bezier[2].y += bezier[3].y;
CGContextMoveToPoint(ctx, bezier[0].x, bezier[0].y);
CGContextAddCurveToPoint(ctx, bezier[1].x, bezier[1].y, bezier[2].x, bezier[2].y, bezier[3].x, bezier[3].y);
[self.touchPoints removeObjectAtIndex:0];
}
CGContextStrokePath(ctx);
CGPoint prevPoint = [touch previousLocationInView:self];
prevPoint = fromUItoQuartz(prevPoint, self.bounds.size);
prevPoint = scalePoint(prevPoint, self.bounds.size, size);
static const FillTileWithTwoPointsFunc fillTileFunc = (FillTileWithTwoPointsFunc) [self methodForSelector:@selector(fillTileWithTwoPoints:end:)];
(*fillTileFunc)(self,@selector(fillTileWithTwoPoints:end:),touchPoint, prevPoint);
}
}
// was _tilesFilled changed?
if(tempFilled != _tilesFilled) {
[_delegate mdScratchImageView:self didChangeMaskingProgress:self.maskingProgress];
}
CGImageRef cgImage = CGBitmapContextCreateImage(ctx);
UIImage *image = [UIImage imageWithCGImage:cgImage];
CGImageRelease(cgImage);
return image;
}
/*
* filling tile with one ellipse
*/
-(void)fillTileWithPoint:(CGPoint) point{
size_t x,y;
point.x = MAX( MIN(point.x, self.image.size.width - 1) , 0);
point.y = MAX( MIN(point.y, self.image.size.height - 1), 0);
x = point.x * self.maskedMatrix.max.x / self.image.size.width;
y = point.y * self.maskedMatrix.max.y / self.image.size.height;
char value = [self.maskedMatrix valueForCoordinates:x y:y];
if (!value){
[self.maskedMatrix setValue:1 forCoordinates:x y:y];
_tilesFilled++;
}
}
/*
* filling tile with line
*/
-(void)fillTileWithTwoPoints:(CGPoint)begin end:(CGPoint)end{
CGFloat incrementerForx,incrementerFory;
static const FillTileWithPointFunc fillTileFunc = (FillTileWithPointFunc) [self methodForSelector:@selector(fillTileWithPoint:)];
/* incrementers - about size of a tile */
incrementerForx = (begin.x < end.x ? 1 : -1) * self.image.size.width / _tilesX;
incrementerFory = (begin.y < end.y ? 1 : -1) * self.image.size.height / _tilesY;
// iterate on points between begin and end
CGPoint i = begin;
while(i.x <= MAX(begin.x, end.x) && i.y <= MAX(begin.y, end.y) && i.x >= MIN(begin.x, end.x) && i.y >= MIN(begin.y, end.y)){
(*fillTileFunc)(self,@selector(fillTileWithPoint:),i);
i.x += incrementerForx;
i.y += incrementerFory;
}
(*fillTileFunc)(self,@selector(fillTileWithPoint:),end);
}
@end