CIFunHouse/Custom Filters/DistortionsDemo.m
/* |
File: DistortionsDemo.m |
Abstract: |
Version: 1.0 |
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*/ |
#if TARGET_OS_IPHONE |
#import <CoreImage/CoreImage.h> |
#else |
#import <QuartzCore/QuartzCore.h> |
#endif |
@interface DistortionDemo : CIFilter |
{ |
CIImage *inputImage; |
} |
@property (retain, nonatomic) CIImage *inputImage; |
@end |
@implementation DistortionDemo |
@synthesize inputImage; |
+ (NSDictionary *)customAttributes |
{ |
return @{ |
kCIAttributeFilterDisplayName : @"Distortion Demo", |
kCIAttributeFilterCategories : @[kCICategoryDistortionEffect, kCICategoryVideo, kCICategoryInterlaced, kCICategoryStillImage] |
}; |
} |
- (CIImage *)outputImage |
{ |
if (inputImage == nil) |
return nil; |
NSArray* filterNames = @[ @"CIHoleDistortion", |
@"CIBumpDistortion", |
@"CIVortexDistortion", |
@"CITwirlDistortion", |
@"CICircleSplashDistortion"]; |
const double twoPi = M_PI * 2.0; |
CFAbsoluteTime time = CFAbsoluteTimeGetCurrent(); |
time = fmod(time, filterNames.count * twoPi); |
CGRect extent = inputImage.extent; |
double cx = extent.origin.x + extent.size.width / 2.0; |
double cy = extent.origin.y + extent.size.height / 2.0; |
cx += cos(time) * extent.size.width * 0.3; |
cy += sin(time) * extent.size.height * 0.3; |
double minDim = MIN(extent.size.width, extent.size.height); |
double r = (cos(2.0 * time) + 1.20) * minDim * 0.15; |
CIVector* center = [CIVector vectorWithX:cx Y:cy]; |
int whichFilter = (int)floor(time / twoPi); |
CIFilter* f = [CIFilter filterWithName:filterNames[whichFilter] keysAndValues: |
@"inputImage", inputImage, |
@"inputCenter", center, |
@"inputRadius", @(r), nil]; |
return f.outputImage; |
} |
@end |
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