我試圖在我的應用程序中實現一個非常簡單的繪圖視圖。這只是我應用程序的一小部分,但它變成了一個真正的麻煩。這是迄今爲止我所擁有的,但現在顯示的全部是莫爾斯電碼,如點和線。iPad(非常)簡單的繪圖
- (void)viewDidLoad {
[super viewDidLoad];
self.view.backgroundColor = [UIColor whiteColor];
NSArray* paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
NSUserDomainMask, YES);
NSString *docsPath = [paths objectAtIndex:0];
NSString *savePath = [NSString stringWithFormat:@"%@/notePadImage.jpg",docsPath];
NSData *data = [NSData dataWithContentsOfFile:savePath];
UIImage *image = [UIImage imageWithData:data];
if (image == nil) {
NSString *pathToBlank = [[NSBundle mainBundle]pathForResource:@"blankNotePadPage" ofType:@"png"];
NSData *data = [NSData dataWithContentsOfFile:pathToBlank];
image = [UIImage imageWithData:data];
}
arrayOfTouches = [[NSMutableArray alloc] initWithCapacity:10];
self.drawImage.image = image;
mouseMoved = 0;
[self.view bringSubviewToFront:closeButton];
[self.view bringSubviewToFront:clearButton];
self.timer = [NSTimer scheduledTimerWithTimeInterval:.02 target:self selector:@selector(drawIt) userInfo:nil repeats:YES];
}
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
[arrayOfTouches addObject:touch];
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
[arrayOfTouches addObject:touch];
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
}
-(void) drawIt {
NSMutableArray *tempArray = [NSMutableArray arrayWithArray:arrayOfTouches];
[arrayOfTouches removeAllObjects];
if ([tempArray count]>1) {
[arrayOfTouches removeAllObjects];
CGPoint point1 = [[tempArray objectAtIndex:0] previousLocationInView:self.view];;
CGPoint point2;
CGPoint point3;
for (int i = 0; i < [tempArray count]-1;i = i+1) {
UIGraphicsBeginImageContext(self.view.frame.size);
[drawImage.image drawInRect:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];
CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapRound);
CGContextSetLineWidth(UIGraphicsGetCurrentContext(), 3.0);
CGContextSetRGBStrokeColor(UIGraphicsGetCurrentContext(), 0.0, 0.0, 0.0, 1.0);
CGContextMoveToPoint(UIGraphicsGetCurrentContext(), point1.x, point1.y);
CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), point2.x, point2.y);
CGContextStrokePath(UIGraphicsGetCurrentContext());
CGContextFlush(UIGraphicsGetCurrentContext());
drawImage.image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
[self.view bringSubviewToFront:closeButton];
[self.view bringSubviewToFront:clearButton];
point1 = point2;
}
}
}
這正是我一直在尋找的東西,謝謝。 – Brodie 2010-10-22 20:44:30
我將如何保存這裏所畫的圖片作爲jpg? – Slee 2010-11-27 21:02:37
'UIGraphicsBeginImageContext(cv.bounds.size); [cv.layer renderInContext:UIGraphicsGetCurrentContext()]; UIImage * image = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); NSData * data = UIImageJPEGRepresentation(image,1.0f); NSString * path = ...; BOOL保存= [數據writeToFile:原子路徑:YES];' – Anna 2010-11-28 03:55:50