Advanced Swipes Tutorial

C4WorkSpace.m

//
//  C4WorkSpace.m
//  Advanced Swipes Tutorial
//
//  Created by Travis Kirton.
//

#import "C4WorkSpace.h"

@implementation C4WorkSpace {
    C4Shape *arrow;
}

-(void)setup {
    [self createArrow];
    
    for(int i = 1; i < 4; i++) {
        NSString *name;
        name = [NSString stringWithFormat:@"down%d",i];
        [self addGesture:SWIPEDOWN name:name action:@"swipe:"];
        [self numberOfTouchesRequired:i forGesture:name];
        name = [NSString stringWithFormat:@"left%d",i];
        [self addGesture:SWIPELEFT name:name action:@"swipe:"];
        [self numberOfTouchesRequired:i forGesture:name];
        name = [NSString stringWithFormat:@"up%d",i];
        [self addGesture:SWIPEUP name:name action:@"swipe:"];
        [self numberOfTouchesRequired:i forGesture:name];
        name = [NSString stringWithFormat:@"right%d",i];
        [self addGesture:SWIPERIGHT name:name action:@"swipe:"];
        [self numberOfTouchesRequired:i forGesture:name];
    }

    self.canvas.multipleTouchEnabled = YES;
}

-(void)createArrow {
    CGMutablePathRef arrowPath = CGPathCreateMutable();
    CGPathMoveToPoint(arrowPath, nil, 0, 10);
    CGPathAddLineToPoint(arrowPath, nil, 192, 10);
    CGPathAddLineToPoint(arrowPath, nil, 187, 0);
    CGPathAddLineToPoint(arrowPath, nil, 222, 15);
    CGPathAddLineToPoint(arrowPath, nil, 187, 30);
    CGPathAddLineToPoint(arrowPath, nil, 192, 20);
    CGPathAddLineToPoint(arrowPath, nil, 0, 20);
    CGPathCloseSubpath(arrowPath);
    
    arrow = [C4Shape rect:CGRectMake(0, 0, 1, 1)];
    arrow.path = arrowPath;
    arrow.lineWidth = 0.0f;
}

-(void)swipe:(UISwipeGestureRecognizer *)swipeGesture {
    NSInteger touchCount = swipeGesture.numberOfTouches;
    
    CGFloat rotation;
    UIColor *arrowColor;
    switch (swipeGesture.direction) {
        case UISwipeGestureRecognizerDirectionUp:
            rotation = -HALF_PI;
            arrowColor = C4RED;
            break;
        case UISwipeGestureRecognizerDirectionLeft:
            rotation = PI;
            arrowColor = C4BLUE;
            break;
        case UISwipeGestureRecognizerDirectionDown:
            rotation = HALF_PI;
            arrowColor = [UIColor colorWithPatternImage:[C4Image imageNamed:@"lines"].UIImage];
            break;
        default:
            rotation = 0;
            arrowColor = C4GREY;
            break;
    }
    
    C4Shape *arrowSet = [self createArrowSet:touchCount rotation:rotation color:arrowColor];

    CGPoint touchPoint = [swipeGesture locationInView:self.canvas];
    arrowSet.center = touchPoint;

    [self.canvas addShape:arrowSet];
    
    [self runMethod:@"fadeOut:" withObject:arrowSet afterDelay:0.25f];
}

-(C4Shape *)createArrowSet:(NSInteger)touchCount rotation:(CGFloat)rotation color:(UIColor *)arrowColor {
    CGFloat gap = 5.0f;
    CGRect arrowSetFrame = CGRectMake(0, 0, arrow.width, arrow.height * touchCount + gap * (touchCount - 1));
    C4Shape *arrowSet = [C4Shape rect:arrowSetFrame];
    arrowSet.lineWidth = 0.0f;
    arrowSet.fillColor = [UIColor clearColor];
    arrowSet.userInteractionEnabled = NO;
    
    for(int i = 0; i < touchCount; i++) {
        C4Shape *newArrow = [arrow copy];
        newArrow.origin = CGPointMake(0,arrow.height*i + gap * i);
        newArrow.fillColor = arrowColor;
        [arrowSet addShape:newArrow];
    }
    
    arrowSet.anchorPoint = CGPointMake(0,0.5f);
    arrowSet.rotation = rotation;
    
    return arrowSet;
}

-(void)fadeOut:(C4Shape *)shape {
    shape.animationDuration = 2.0f;
    shape.alpha = 0.0f;
    
    [shape runMethod:@"removeFromSuperview" afterDelay:shape.animationDuration];
}

@end