Line, Triangles & Polygons

C4WorkSpace.m

//
//  C4WorkSpace.m
//  Examples
//
//  Created by Travis Kirton on 12-07-23.
//


#import "C4WorkSpace.h"

@implementation C4WorkSpace {
    C4Shape *line, *triangle, *polygon, *random;
}

-(void)setup {
    //create a 2 point array for the line
    CGPoint linePoints[2];
    linePoints[0] = CGPointMake(0, 0);
    linePoints[1] = CGPointMake(100, 100);
    line = [C4Shape line:linePoints];
    
    //create a 3 point array for the triangle
    CGPoint trianglePoints[3];
    trianglePoints[0] = CGPointMake(0, 0);
    trianglePoints[1] = CGPointMake(0, 100);
    trianglePoints[2] = CGPointMake(100, 0);
    triangle = [C4Shape triangle:trianglePoints];
    
    //create a 4 point array for the polygon
    CGPoint polyPoints[4];
    polyPoints[0] = CGPointMake(0, 0);
    polyPoints[1] = CGPointMake(0, 100);
    polyPoints[2] = CGPointMake(100, 0);
    polyPoints[3] = CGPointMake(100, 100);
    polygon = [C4Shape polygon:polyPoints pointCount:4];
    line.backgroundColor = [UIColor clearColor];
    
    //create an array between 10 and 20 points for the random shape
    NSInteger randomCount = [C4Math randomInt:10]+10;
    CGPoint randomPoints[randomCount];
    for(int i = 0; i < randomCount; i++) {
        randomPoints[i] = CGPointMake([C4Math randomInt:100], [C4Math randomInt:100]);
    }
    random = [C4Shape polygon:randomPoints pointCount:10];
    
    //Figure out the vertical whitespace (i.e. the space between shapes and the edges of the canvas)
    CGFloat whiteSpace = self.canvas.height - 4* line.height;
    
    whiteSpace = whiteSpace/5; // because there are 5 gaps

    //create a point that will define the center of each shape, aligned to the middle of the canvas
    CGPoint center;
    center.x = self.canvas.center.x;
    
    //set the y position for the line
    center.y = whiteSpace + line.height/2;
    line.center = center;
    
    //set the y position for the triangle
    center.y = center.y + whiteSpace + triangle.height;
    triangle.center = center;
    
    //set the y position for the polygon
    center.y = center.y + whiteSpace + polygon.height;
    polygon.center = center;
    
    //set the y position for the random shape
    center.y = center.y + whiteSpace + random.height;
    random.center = center;
    
    [self.canvas addShape:line];
    [self.canvas addShape:triangle];
    [self.canvas addShape:polygon];
    [self.canvas addShape:random];
}

@end