Advanced stroke start / end

C4WorkSpace.m

//
//  C4WorkSpace.m
//  Examples
//
//  Created by Travis Kirton on 12-07-19.
//

#import "C4WorkSpace.h"

@implementation C4WorkSpace

-(void)setup {
    
    //create and array of points to use for lines
    CGPoint linePoints[2] = {CGPointZero,CGPointMake(self.canvas.width,0.0f)};
    
    //figure out the total number of lines to draw
    CGFloat totalLineCount = self.canvas.height / 6.0f; //default lineWidth (5.0f) + 1.0f gap between each line
    
    //figure out displacement of strokeStart and strokeEnd
    CGFloat strokeDisplacement = 0.5f / totalLineCount;
    
    for(int i = 0; i < totalLineCount; i++) {
        linePoints[0].y = i*6.0f + 2.5f;
        linePoints[1].y = linePoints[0].y;

        //create a new line
        C4Shape *newLine = [C4Shape line:linePoints];
        
        //determine the current displacement of the ends of the line
        CGFloat currentDisplacement = strokeDisplacement*(i+1);
        newLine.strokeStart = 0.5 - currentDisplacement;
        newLine.strokeEnd = 0.5f + currentDisplacement;

        //... and add it to the canvas
        [self.canvas addShape:newLine];
    }
}
@end