ios - 识别使用贝塞尔路径绘制的文本

Question

我编写了以下代码，用于使用贝塞尔路径绘制文本。
现在我的任务是我们如何识别使用 Beizer 路径绘制的文本。
例如，如果我画“苹果”，那么我的标签将显示“你画了苹果”。

@implementation NaiveVarWidthView
{
UIBezierPath *path;
UIImage *incrementalImage;
CGPoint pts[5];
uint ctr;
}
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
    [self setMultipleTouchEnabled:NO];
    path = [UIBezierPath bezierPath];
}
return self;
}
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
ctr = 0;
UITouch *touch = [touches anyObject];
pts[0] = [touch locationInView:self];
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
CGPoint p = [touch locationInView:self];
ctr++;
pts[ctr] = p;
if (ctr == 4)
{
    pts[3] = CGPointMake((pts[2].x + pts[4].x)/2.0, (pts[2].y + pts[4].y)/2.0);
    [path moveToPoint:pts[0]];
    [path addCurveToPoint:pts[3] controlPoint1:pts[1] controlPoint2:pts[2]];
    UIGraphicsBeginImageContextWithOptions(self.bounds.size, YES, 0.0); // 
    if (!incrementalImage)
    {
        UIBezierPath *rectpath = [UIBezierPath bezierPathWithRect:self.bounds];
        [[UIColor whiteColor] setFill];
        [rectpath fill];
    }
    [incrementalImage drawAtPoint:CGPointZero];
    [[UIColor blackColor] setStroke];
    float speed = 0.0;
    for (int i = 0; i < 3; i++)
    {
        float dx = pts[i+1].x - pts[i].x;
        float dy = pts[i+1].y - pts[i].y;
        speed += sqrtf(dx * dx + dy * dy);
    } 
#define FUDGE_FACTOR 100 
    float width = FUDGE_FACTOR/speed; 
    [path setLineWidth:width];
    [path stroke];
    incrementalImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    [self setNeedsDisplay];
    [path removeAllPoints]; 
    pts[0] = pts[3];
    pts[1] = pts[4];
    ctr = 1;
}
}
- (void)drawRect:(CGRect)rect
{
  [incrementalImage drawInRect:rect];
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
  [self setNeedsDisplay];
}
- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event
{
  [self touchesEnded:touches withEvent:event];
}
@end

Answer 1

我不确定您是否有兴趣使用开源代码，但您可以尝试一下 GLGestureRecognizer .

这是对您在 stack-Overflow 中的问题的一个这样的回答。