检测圆圈上的接触点，Cocos2d [英] Detect touch point on circle , Cocos2d

问题描述

我在cocos2d中创建了一个带有 draw 函数的圆圈，我想在圆线上检测触摸点，让我们说用户触摸我要打印的圆圈底部270，如果用户触摸圈子的顶部我想打印90等....

我看过这个问题，但他们检测到一个sprite，然后只是比较，如果touch内圈或外圈

http://www.cocos2d-iphone.org/forum/topic/21629

如何检测圈子中的触摸

   - （void）draw 
 {
 CGSize winSize = [[CCDirector sharedDirector] winSize]; 
 glLineWidth（10.0f）; 
 ccDrawColor4F（0.2f，0.9f，0.02f，0.6f）; 
 CGPoint center = ccp（winSize.width * 0.88，winSize.height * 0.8）; 
 CGFloat radius = 100.f; 
 CGFloat angle = 0.f; 
 NSInteger segments = 100; 
 BOOL drawLineToCenter = YES; 
 
 ccDrawCircle（center，radius，angle，segments，drawLineToCenter）; 
} 
  

如何检测圆线上的接触点？

解决方案

尝试这个，没有测试代码，根据你的需要改进

- （BOOL）ccTouchBegan：（UITouch *）touch withEvent：（UIEvent *）event
{
CGSize winSize = [[CCDirector sharedDirector] winSize] ;
CGPoint location = [[CCDirector sharedDirector] convertToGL：[touch locationInView：[touch view]]];
CGPoint center = ccp（winSize.width * 0.88，winSize.height * 0.8）;

//现在测试接触点距离中心的距离根据需要改变值
if（ccpDistance（center，location）< 100）
{
NSLog（@inside）;

//计算弧度和圆度
CGPoint diff = ccpSub（center，location）; //返回ccp（v1.x - v2.x，v1.y - v2.y ）;
float rads = atan2f（diff.y，diff.x）;
float degs = -CC_RADIANS_TO_DEGREES（rads）;
switch（degs）
{
case -90：
//这是底部
break;
case 90：
//这是top
break;
case 0：
//这是左侧
break;
case 180：
//这是右侧
break;
默认值：
break;
}
}
return YES;
}


I have created a circle with draw function in cocos2d, I am trying to detect touch point on circle line, lets say user touches bottom of the circle I want to print 270, if user touches top of the circle I want to print 90 etc....

I have looked this questions but they detect a sprite first then just compare if touches inside or outside of the circle

http://www.cocos2d-iphone.org/forum/topic/21629

how to detect touch in a circle

- (void) draw
{
    CGSize winSize = [[CCDirector sharedDirector] winSize];
    glLineWidth(10.0f);
    ccDrawColor4F(0.2f, 0.9f, 0.02f, 0.6f);
    CGPoint center = ccp(winSize.width*0.88, winSize.height*0.8);
    CGFloat radius = 100.f;
    CGFloat angle = 0.f;
    NSInteger segments = 100;
    BOOL drawLineToCenter = YES;

    ccDrawCircle(center, radius, angle, segments, drawLineToCenter);
}

How can I detect a touch point on the circle line?

解决方案

Try this , didnt test the code , improved it according to your needs

-(BOOL) ccTouchBegan:(UITouch*)touch withEvent:(UIEvent*)event
{    
    CGSize winSize = [[CCDirector sharedDirector] winSize];
    CGPoint location = [[CCDirector sharedDirector] convertToGL:[touch locationInView:[touch view]]];
    CGPoint center=ccp(winSize.width*0.88, winSize.height*0.8);

    //now test against the distance of the touchpoint from the center change the value acording to your need
    if (ccpDistance(center, location)<100)
    {
        NSLog(@"inside");

        //calculate radians and degrees in circle
        CGPoint diff = ccpSub(center, location);//return ccp(v1.x - v2.x, v1.y - v2.y);
        float rads = atan2f( diff.y, diff.x);
        float degs = -CC_RADIANS_TO_DEGREES(rads);
        switch (degs) 
        {
            case -90:
            //this is bottom
            break;
            case 90:
                //this is top
                break;
            case 0:
                //this is left side
                break;
            case 180:
                //this is right side
                break;
            default:
                break;
        }
    }   
    return YES;
}

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