PhuceContext.h

#import <UIKit/UIKit.h>

namespace PhuceContext {
	
	// state (4.8.11.1.1)
	
	bool save();
	bool restore();
	
	// transformations (4.8.11.1.2)
	
	bool scale(double x, double y);
	bool rotate(double angle);
	bool translate(double x, double y);
	bool transform(double m11, double m12, double m21, double m22,
				   double dx, double dy);
	bool setTransform(double m11, double m12, double m21, double m22,
					  double dx, double dy);
	
	// compositing (4.8.11.1.3)
	
	enum CompositeOp {
		kCompositeOpSourceAtop,
		kCompositeOpSourceIn,
		kCompositeOpSourceOut,
		kCompositeOpSourceOver,
		kCompositeOpDestinationAtop,
		kCompositeOpDestinationIn,
		kCompositeOpDestinationOut,
		kCompositeOpDestinationOver,
		kCompositeOpLighter,
		kCompositeOpCopy,
		kCompositeOpXor
	};
	
	bool setGlobalAlpha(double value);
	bool setGlobalCompositeOperation(CompositeOp value);
	
	// colors and styles (4.8.11.1.4)
	
	// line styles (4.8.11.1.5)
	
	enum LineCap {
		kLineCapButt,
		kLineCapRound,
		kLineCapSquare
	};
	
	enum LineJoin {
		kLineJoinBevel,
		kLineJoinRound,
		kLineJoinMiter
	};
	
	bool setLineWidth(double value);
	bool setLineCap(LineCap value);
	bool setLineJoin(LineJoin value);
	bool setMiterLimit(double value);
	
	// shadows (4.8.11.1.6)
	
	// rectangles (4.8.11.1.7)
	
	bool clearRect(double x, double y, double w, double h);
	bool fillRect(double x, double y, double w, double h);
	bool strokeRect(double x, double y, double w, double h);
	
	// paths (4.8.11.1.8)
	
	bool beginPath();
	bool moveTo(double x, double y);
	bool closePath();
	bool lineTo(double x, double y);
	bool quadraticCurveTo(double cpx, double cpy, double x, double y);
	bool bezierCurveTo(double cp1x, double cp1y, double cp2x, double cp2y,
					   double x, double y);
	bool arcTo(double x1, double y1, double x2, double y2, double radius);
	bool arc(double x, double y, double radius, double startAngle,
			 double endAngle, bool anticlockwise);
	bool rect(double x, double y, double w, double h);
	bool fill();
	bool stroke();
	bool clip();
	bool isPointInPath(double x, double y, bool *result);
}

PhuceContext.mm

#import "PhuceContext.h"

namespace PhuceContext {
	
	// state (4.8.11.1.1)
	
	bool save() {
		CGContextRef context = UIGraphicsGetCurrentContext();
		CGContextSaveGState(context);
		return true;
	}
	
	bool restore() {
		CGContextRef context = UIGraphicsGetCurrentContext();
		CGContextRestoreGState(context);
		return true;
	}
	
	// transformations (4.8.11.1.2)
	
	bool scale(double x, double y) {
		CGContextRef context = UIGraphicsGetCurrentContext();
		CGContextScaleCTM(context, x, y);
		return true;
	}
	
	bool rotate(double angle) {
		CGContextRef context = UIGraphicsGetCurrentContext();
		CGContextRotateCTM(context, angle);
		return true;
	}
	
	bool translate(double x, double y) {
		CGContextRef context = UIGraphicsGetCurrentContext();
		CGContextTranslateCTM(context, x, y);
		return true;
	}
	
	bool transform(double m11, double m12, double m21, double m22,
				   double dx, double dy) {
		CGContextRef context = UIGraphicsGetCurrentContext();
		CGAffineTransform transform = {
			m11, m12, m21, m22, dx, dy
		};
		CGContextConcatCTM(context, transform);
		return true;
	}
	
	bool setTransform(double m11, double m12, double m21, double m22,
					  double dx, double dy) {
		CGContextRef context = UIGraphicsGetCurrentContext();
		CGAffineTransform transform = CGContextGetCTM(context);
		transform.a = m11;
		transform.b = m12;
		transform.c = m21;
		transform.d = m22;
		transform.tx = dx;
		transform.ty = dy;
		return true;
	}
	
	// compositing (4.8.11.1.3)
	
	bool setGlobalAlpha(double value) {
		CGContextRef context = UIGraphicsGetCurrentContext();
		CGContextSetAlpha(context, value);
		return true;
	}
	
	bool setGlobalCompositeOperation(CompositeOp value) {
		CGBlendMode mode;
		switch (value) {
			case kCompositeOpSourceAtop:
				mode = kCGBlendModeSourceAtop;
				break;
			case kCompositeOpSourceIn:
				mode = kCGBlendModeSourceIn;
				break;
			case kCompositeOpSourceOut:
				mode = kCGBlendModeSourceOut;
				break;
			case kCompositeOpSourceOver:
				mode = kCGBlendModeNormal;
				break;
			case kCompositeOpDestinationAtop:
				mode = kCGBlendModeDestinationAtop;
				break;
			case kCompositeOpDestinationIn:
				mode = kCGBlendModeDestinationIn;
				break;
			case kCompositeOpDestinationOut:
				mode = kCGBlendModeDestinationOut;
				break;
			case kCompositeOpDestinationOver:
				mode = kCGBlendModeDestinationOver;
				break;
			case kCompositeOpLighter:
				mode = kCGBlendModeLighten;
				break;
			case kCompositeOpCopy:
				mode = kCGBlendModeCopy;
				break;
			case kCompositeOpXor:
				mode = kCGBlendModeXOR;
				break;
			default:
				return true;
		}
		CGContextRef context = UIGraphicsGetCurrentContext();
		CGContextSetBlendMode(context, mode);
		return true;
	}
	
	// colors and styles (4.8.11.1.4)
	// FIXME: todo
	
	// line styles (4.8.11.1.5)
	
	bool setLineWidth(double value) {
		CGContextRef context = UIGraphicsGetCurrentContext();
		CGContextSetLineWidth(context, value);
		return true;
	}
	
	bool setLineCap(LineCap value) {
		CGLineCap cap;
		switch (value) {
			case kLineCapButt:
				cap = kCGLineCapButt;
				break;
			case kLineCapRound:
				cap = kCGLineCapRound;
				break;
			case kLineCapSquare:
				cap = kCGLineCapSquare;
				break;
			default:
				return true;
		}
		CGContextRef context = UIGraphicsGetCurrentContext();
		CGContextSetLineCap(context, cap);
		return true;
	}
	
	bool setLineJoin(LineJoin value) {
		CGLineJoin join;
		switch (value) {
			case kLineJoinBevel:
				join = kCGLineJoinBevel;
				break;
			case kLineJoinRound:
				join = kCGLineJoinRound;
				break;
			case kLineJoinMiter:
				join = kCGLineJoinMiter;
				break;
			default:
				return true;
		}
		CGContextRef context = UIGraphicsGetCurrentContext();
		CGContextSetLineJoin(context, join);
		return true;
	}
	
	// FIXME: this should default to 10, what does cg default to?
	bool setMiterLimit(double value) {
		CGContextRef context = UIGraphicsGetCurrentContext();
		CGContextSetMiterLimit(context, value);
		return true;
	}
	
	// shadows (4.8.11.1.6)
	// FIXME: todo
	
	// rectangles (4.8.11.1.7)
	
	bool clearRect(double x, double y, double w, double h) {
		CGContextRef context = UIGraphicsGetCurrentContext();
		CGRect rect = CGRectMake(x, y, w, h);
		CGContextClearRect(context, rect);
		return true;
	}
	
	bool fillRect(double x, double y, double w, double h) {
		CGContextRef context = UIGraphicsGetCurrentContext();
		CGRect rect = CGRectMake(x, y, w, h);
		CGContextFillRect(context, rect);
		return true;
	}
	
	bool strokeRect(double x, double y, double w, double h) {
		CGContextRef context = UIGraphicsGetCurrentContext();
		CGRect rect = CGRectMake(x, y, w, h);
		CGContextStrokeRect(context, rect);
		return true;
	}
	
	// paths (4.8.11.1.8)
	
	bool beginPath() {
		CGContextRef context = UIGraphicsGetCurrentContext();
		CGContextBeginPath(context);
		return true;
	}
	
	bool moveTo(double x, double y) {
		CGContextRef context = UIGraphicsGetCurrentContext();
		CGContextMoveToPoint(context, x, y);
		return true;
	}
	
	bool closePath() {
		CGContextRef context = UIGraphicsGetCurrentContext();
		CGContextClosePath(context);
		return true;
	}
	
	bool lineTo(double x, double y) {
		CGContextRef context = UIGraphicsGetCurrentContext();
		CGContextAddLineToPoint(context, x, y);
		return true;
	}
	
	bool quadraticCurveTo(double cpx, double cpy, double x, double y) {
		CGContextRef context = UIGraphicsGetCurrentContext();
		CGContextAddQuadCurveToPoint(context, cpx, cpy, x, y);
		return true;
	}
	
	bool bezierCurveTo(double cp1x, double cp1y, double cp2x, double cp2y,
					   double x, double y) {
		CGContextRef context = UIGraphicsGetCurrentContext();
		CGContextAddCurveToPoint(context, cp1x, cp1y, cp2x, cp2y, x, y);
		return true;
	}
	
	bool arcTo(double x1, double y1, double x2, double y2, double radius) {
		CGContextRef context = UIGraphicsGetCurrentContext();
		CGContextAddArcToPoint(context, x1, y1, x2, y2, radius);
		return true;
	}
	
	bool arc(double x, double y, double radius, double startAngle,
			 double endAngle, bool anticlockwise) {
		CGContextRef context = UIGraphicsGetCurrentContext();
		CGContextAddArc(context, x, y, radius, startAngle, endAngle,
						(int)anticlockwise);
		return true;
	}
	
	bool rect(double x, double y, double w, double h) {
		CGContextRef context = UIGraphicsGetCurrentContext();
		CGRect rect = CGRectMake(x, y, w, h);
		CGContextAddRect(context, rect);
		return true;
	}
	
	bool fill() {
		CGContextRef context = UIGraphicsGetCurrentContext();
		CGContextFillPath(context);
		return true;
	}
	
	bool stroke() {
		CGContextRef context = UIGraphicsGetCurrentContext();
		CGContextStrokePath(context);
		return true;
	}
	
	bool clip() {
		CGContextRef context = UIGraphicsGetCurrentContext();
		CGContextClip(context);
		return true;
	}
	
	bool isPointInPath(double x, double y, bool *result) {
		CGContextRef context = UIGraphicsGetCurrentContext();
		CGPoint point = CGPointMake(x, y);
		*result = CGContextPathContainsPoint(context, point, kCGPathFill);
		return true;
	}
	
	// focus management (4.8.11.1.9)
	// FIXME: todo
	
	// text (4.8.11.1.10)
	// FIXME: todo
	
	// images (4.8.11.1.11)
	// FIXME: todo
	
	// pixel manipulation (4.8.11.1.12)
	// FIXME: todo
}