Line Widths (Advanced)

C4WorkSpace.m

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

#import "C4WorkSpace.h"

@implementation C4WorkSpace

-(void)setup {
    //create an x position, 1% of the width of the canvas
    CGFloat x1 = self.canvas.width*0.01f;

    //create a second x position, equally distant from the right edge of the canvas
    CGFloat x2 = self.canvas.width-x1;
    
    //create and array of points to use for lines
    CGPoint linePoints[2] = {CGPointMake(x1, 75),CGPointMake(x2, 75)};

    //create the first line, at the default width
    C4Shape *line = [C4Shape line:linePoints];
    [self.canvas addShape:line];
        
    //shift the line points
    linePoints[0].y *= 2;
    linePoints[1].y *= 2;
    
    //loop until the screen is full
    for(int i = 0; linePoints[0].y < self.canvas.height; i++) {
        
        //define the current line with, exponentially growing
        CGFloat currentLineWidth = 2.0f + [C4Math pow:1.15f raisedTo:i];

        //shift the line points based on the current line width (with a little gap)
        linePoints[0].y += currentLineWidth+1.0f;
        linePoints[1].y += currentLineWidth+1.0f;
        
        //create a new line and add it to the canvas
        C4Shape *newLine = [C4Shape line:linePoints];
        newLine.lineWidth = currentLineWidth;
        [self.canvas addShape:newLine];
    }
}
@end