如何创建一个允许用户自由手绘的应用程序? [英] how to create an application which allows user to free hand drawing?
问题描述
我是iPad应用程序开发的新手。
i am new to iPad application development.
我有责任开发像 iDesk 应用程序我不知道如何从应用程序开始。
I have task to develop an application like iDesk application i don't know how to start with application.
此应用程序有1.徒手绘图2.形状识别&更多功能。但我不知道如何从这个应用程序开始。
请帮助我。
this application has 1. Freehand Drawing 2. Shape Recognition & much more functionality. but i don't know how to start with this app. please help me.
提供有关如何创建此应用程序的一些详细信息。我认为这个应用程序是从openGL创建的。如果可能,请提供一些样品。
provide some details about that how to create this app. i think this app is created from openGL. please provide me some samples if it is possible.
请帮助我。
我发布了一个新的问题本主题新问题对于这个主题
I have posted new question about this topic New Question for this topic
请帮助我。
推荐答案
使用以下我之前使用过的。它肯定会起作用: -
Use the following i have used it earlier. It will work definately:-
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
mouseSwiped = NO;
UITouch *touch = [touches anyObject];
if ([touch tapCount] == 2) {
[drawImage setImage:[UIImage imageWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"white" ofType:@"png"]]];
return;
}
lastPoint = [touch locationInView:self.view];
lastPoint.y -= 20;
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
mouseSwiped = YES;
UITouch *touch = [touches anyObject];
CGPoint currentPoint = [touch locationInView:self.drawImage];
currentPoint.y -= 20;
NSLog(@"current Point is x: %d, y: %d",currentPoint.x,currentPoint.y);
UIGraphicsBeginImageContext(self.drawImage.frame.size);
[drawImage.image drawInRect:CGRectMake(0, 0, self.drawImage.frame.size.width, self.drawImage.frame.size.height)];
CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapRound);
CGContextSetLineWidth(UIGraphicsGetCurrentContext(), 5.0);
CGContextSetRGBStrokeColor(UIGraphicsGetCurrentContext(), 0.0, 0.5, 0.6, 1.0);
CGContextBeginPath(UIGraphicsGetCurrentContext());
CGContextMoveToPoint(UIGraphicsGetCurrentContext(), lastPoint.x, lastPoint.y);
CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), currentPoint.x, currentPoint.y);
CGContextStrokePath(UIGraphicsGetCurrentContext());
drawImage.image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
lastPoint = currentPoint;
}
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