//
//  MPSumFunctionLayout.m
//  MathPad
//
//  Created by Kim Wittenburg on 23.04.14.
//  Copyright (c) 2014 Kim Wittenburg. All rights reserved.
//

#import "MPSumFunctionLayout.h"
#import "MPSumFunction.h"

@implementation MPSumFunctionLayout

- (MPSumFunction *)sumFunction
{
    return (MPSumFunction *)self.function;
}

- (CTLineRef)line
{
    CTLineRef line = [self lineForPrivateCacheIndex:0 generator:^CTLineRef{
        NSAttributedString *text =
            [[NSAttributedString alloc] initWithString:@"∑"
                                            attributes:@{NSFontAttributeName: [NSFont fontWithName:@"Lucida Grande" size:18.0]}];
        CFAttributedStringRef attributedString = CFBridgingRetain(text);
        CTLineRef line = CTLineCreateWithAttributedString(attributedString);
        CFRelease(attributedString); // TODO: Is this release appropriate
        return line;
    }];
    return line;
}

- (NSSize)generateSize
{
    CTLineRef line = [self line];
    CFRetain(line);
    CGSize size = CTLineGetBoundsWithOptions(line, /*kCTLineBoundsUseOpticalBounds*/0).size;
    CFRelease(line);
    return size;
}

- (void)drawAtPoint:(NSPoint)point
{
    // Get the current context
    CGContextRef context = (CGContextRef)[[NSGraphicsContext currentContext] graphicsPort];
    
    // Set the text matrix
    CGContextSetTextMatrix(context, CGAffineTransformIdentity);
    
    // Get the line of text
    CTLineRef line = [self line];
    CFRetain(line);
    
    // Draw the line
    CGContextSetTextPosition(context, point.x, point.y);
    CTLineDraw(line, context);
    
    CFRelease(line);
}

@end