我用下面的代码制作了Circle
//Color Declaration
UIColor *color = [UIColor colorWithRed:0 green:0.429 blue:0 alpha:1];
//Drawing Circle
CGRect circleRect = CGRectMake(20, 20, 170, 170);
UIBezierPath *circlePath = [UIBezierPath bezierPath];
[circlePath addArcWithCenter:CGPointMake(CGRectGetMidX(circleRect), CGRectGetMidY(circleRect))
radius:CGRectGetWidth(circleRect)/2 startAngle:0 * M_PI/180
endAngle:289 * M_PI/180
clockwise:YES];
[circlePath addLineToPoint:CGPointMake(CGRectGetMidX(circleRect), CGRectGetMidY(circleRect))];
[circlePath closePath];
[color setFill];
[circlePath fill];
我已经使用下面的代码验证了带有圆形区域的触摸代码,
- (BOOL)validatePoint:(CGPoint)myPoint
{
// calculate how far from centre we are with Pythagorean
// √ a2 + b2
CGFloat a = abs(myPoint.x - (self.view.bounds.size.width/2));
CGFloat b = abs(myPoint.y - (self.view.bounds.size.height/2));
CGFloat distanceFromCentre = sqrt(pow(a,2) + pow(b,2));
if((distanceFromCentre > self.minRadiusSize) && (distanceFromCentre < self.maxRadiusSize)){
return YES;
}else{
// not inside doughnut
return NO;
}
}
我已经用上面的代码验证了圆。当上面的代码为真时,我们可以向圆添加触摸。
同样,我必须验证圆的扇区(部分)。
我的要求是,我必须验证圈子。我是否必须检测绘制圆的扇区(部分)。我有公式
[Area of Sector = ½ × (θ × π/180) × r2 (when θ is in degrees)]
。