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91 lines
2.2 KiB
Objective-C
91 lines
2.2 KiB
Objective-C
#import "TGPaintArrowBrush.h"
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const CGFloat TGPaintArrowBrushHardness = 0.92f;
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@implementation TGPaintArrowBrush
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- (CGFloat)spacing
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{
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return 0.15f;
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}
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- (CGFloat)alpha
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{
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return 0.85f;
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}
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- (CGFloat)angle
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{
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return 0.0f;
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}
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//- (CGFloat)dynamic
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//{
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// return 0.75f;
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//}
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- (bool)arrow
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{
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return true;
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}
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- (CGImageRef)generateRadialStampForSize:(CGSize)size hardness:(CGFloat)hardness
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{
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CGColorSpaceRef colorspace = CGColorSpaceCreateDeviceGray();
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CGContextRef ctx = CGBitmapContextCreate(NULL, (NSInteger)size.width, (NSInteger)size.height, 8, (NSInteger)size.width, colorspace, kCGImageAlphaNone);
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CGContextSetGrayFillColor(ctx, 0.0f, 1.0f);
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CGContextFillRect(ctx, CGRectMake(0, 0, size.width, size.height));
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NSArray *colors = @[(__bridge id) [UIColor whiteColor].CGColor, (__bridge id) [UIColor blackColor].CGColor];
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const CGFloat locations[] = {0.0, 1.0};
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CGGradientRef gradientRef = CGGradientCreateWithColors(colorspace, (__bridge CFArrayRef) colors, locations);
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CGPoint center = CGPointMake(size.width / 2, size.height / 2);
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CGFloat maxRadius = size.width / 2;
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CGFloat hFactor = hardness * 0.99;
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CGGradientDrawingOptions options = kCGGradientDrawsBeforeStartLocation |kCGGradientDrawsAfterEndLocation;
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CGContextDrawRadialGradient(ctx, gradientRef, center, hFactor * maxRadius, center, maxRadius, options);
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CGImageRef image = CGBitmapContextCreateImage(ctx);
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CGContextRelease(ctx);
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CGColorSpaceRelease(colorspace);
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CGGradientRelease(gradientRef);
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return image;
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}
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- (CGImageRef)stampRef
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{
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static CGImageRef image = NULL;
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if (image == NULL)
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image = [self generateRadialStampForSize:TGPaintBrushTextureSize hardness:TGPaintArrowBrushHardness];
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return image;
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}
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- (CGImageRef)previewStampRef
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{
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if (_previewStampRef == NULL)
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_previewStampRef = [self generateRadialStampForSize:TGPaintBrushPreviewTextureSize hardness:TGPaintArrowBrushHardness];
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return _previewStampRef;
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}
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static UIImage *radialBrushPreviewImage = nil;
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- (UIImage *)previewImage
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{
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return radialBrushPreviewImage;
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}
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- (void)setPreviewImage:(UIImage *)previewImage
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{
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radialBrushPreviewImage = previewImage;
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}
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@end
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