Curtis Hard
5a03e8c27c
- Also added IJSVGUnit so that graidents know if to work out from the current bounds or not when creating the angle points - Added IJSVGImage which is a wrapper around loading base64 encoded images - Added IJSVGPattern which is based on IJSVGGroup and will draw a pattern inside a nodes clipped path
86 lines
3.1 KiB
Objective-C
86 lines
3.1 KiB
Objective-C
//
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// IJSVGGradient.m
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// IJSVGExample
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//
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// Created by Curtis Hard on 03/09/2014.
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// Copyright (c) 2014 Curtis Hard. All rights reserved.
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//
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#import "IJSVGLinearGradient.h"
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#import "IJSVGUtils.h"
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@implementation IJSVGLinearGradient
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+ (NSGradient *)parseGradient:(NSXMLElement *)element
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gradient:(IJSVGLinearGradient *)aGradient
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startPoint:(CGPoint *)startPoint
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endPoint:(CGPoint *)endPoint
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{
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// assume its a vertical / horizonal
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aGradient.x1 = IJSVGUnitFromString([[element attributeForName:@"x1"] stringValue]);
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aGradient.x2 = IJSVGUnitFromString([[element attributeForName:@"x2"] stringValue]);
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aGradient.y1 = IJSVGUnitFromString([[element attributeForName:@"y1"] stringValue]);
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aGradient.y2 = IJSVGUnitFromString([[element attributeForName:@"y2"] stringValue]);
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//
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// *startPoint = CGPointMake(x1, y1);
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// *endPoint = CGPointMake(x2, y2);
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//
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// // horizontal
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// if( y1 == y2 && x1 != x2 )
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// aGradient.angle = 0.f;
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//
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// // vertical
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// else if( x1 == x2 && y1 != y2 )
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// aGradient.angle = 270.f;
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//
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// // angles
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// else if( x1 != x2 && y1 != y2 )
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// aGradient.angle = [IJSVGUtils angleBetweenPointA:NSMakePoint( x1, y1 )
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// pointb:NSMakePoint( x2, y2 )];
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// compute the color stops and colours
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NSArray * colors = nil;
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CGFloat * stopsParams = [[self class] computeColorStopsFromString:element
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colors:&colors];
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// create the gradient with the colours
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NSGradient * grad = [[[NSGradient alloc] initWithColors:colors
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atLocations:stopsParams
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colorSpace:[NSColorSpace genericRGBColorSpace]] autorelease];
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free(stopsParams);
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return grad;
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}
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- (void)drawInContextRef:(CGContextRef)ctx
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path:(IJSVGPath *)path
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{
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// grab the start and end point
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CGPoint aStartPoint = CGPointMake(IJSVGFloatFromUnit(x1, path, YES), IJSVGFloatFromUnit(y1, path, NO));
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CGPoint aEndPoint = CGPointMake(IJSVGFloatFromUnit(x2, path, YES), IJSVGFloatFromUnit(y2, path, NO));
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// convert the nsgradient to a CGGradient
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CGGradientRef gRef = [self CGGradient];
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// apply transform for each point
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for( IJSVGTransform * transform in self.transforms ) {
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CGAffineTransform trans = transform.CGAffineTransform;
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aStartPoint = CGPointApplyAffineTransform(aStartPoint, trans);
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aEndPoint = CGPointApplyAffineTransform(aEndPoint, trans);
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}
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// we need to move the context into the path coordinate space - so save the state!
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CGContextSaveGState(ctx);
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CGContextTranslateCTM(ctx, path.path.bounds.origin.x, path.path.bounds.origin.y);
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// draw the gradient
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CGGradientDrawingOptions opt = kCGGradientDrawsBeforeStartLocation|kCGGradientDrawsAfterEndLocation;
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CGContextDrawLinearGradient(ctx, gRef, aStartPoint, aEndPoint, opt);
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// restore the state
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CGContextRestoreGState(ctx);
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}
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@end
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