CGPoint到NSValue并反向 [英] CGPoint to NSValue and reverse
本文介绍了CGPoint到NSValue并反向的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我有代码:
NSMutableArray *vertices = [[NSMutableArray alloc] init];
//Getting mouse coordinates
loc = [self convertPoint: [event locationInWindow] fromView:self];
[vertices addObject:loc]; // Adding coordinates to NSMutableArray
//Converting from NSMutableArray to GLfloat to work with OpenGL
int count = [vertices count] * 2; // * 2 for the two coordinates of a loc object
GLFloat []glVertices = (GLFloat *)malloc(count * sizeof(GLFloat));
int currIndex = 0;
for (YourLocObject *loc in vertices) {
glVertices[currIndex++] = loc.x;
glVertices[currIndex++] = loc.y;
}
loc
,所以我需要以某种方式从CGPoint更改为NSValue,将其添加到NSMutableArray,之后将其转换回CGPoint。
loc
is CGPoint, so i need somehow to change from CGPoint to NSValue to add it to NSMutableArray and after that convert it back to CGPoint. How could it be done?
推荐答案
类 NSValue
有方法 + [valueWithPoint:]
和 - [CGPointValue]
?这是你要找的吗?
The class NSValue
has methods +[valueWithPoint:]
and -[CGPointValue]
? Is this what you are looking for?
//Getting mouse coordinates
NSMutableArray *vertices = [[NSMutableArray alloc] init];
CGPoint location = [self convertPoint:event.locationInWindow fromView:self];
NSValue *locationValue = [NSValue valueWithPoint:location];
[vertices addObject:locationValue];
//Converting from NSMutableArray to GLFloat to work with OpenGL
NSUInteger count = vertices.count * 2; // * 2 for the two coordinates
GLFloat GLVertices[] = (GLFloat *)malloc(count * sizeof(GLFloat));
for (NSUInteger i = 0; i < count; i++) {
NSValue *locationValue = [vertices objectAtIndex:i];
CGPoint location = locationValue.CGPointValue;
GLVertices[i] = location.x;
GLVertices[i] = location.y;
}
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