xcode CGPoint 到 NSValue 并反转
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CGPoint to NSValue and reverse
提问by hockeyman
I have code:
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;
}
locis 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?
loc是 CGPoint，所以我需要以某种方式从 CGPoint 更改为 NSValue 以将其添加到 NSMutableArray，然后将其转换回 CGPoint。怎么可能呢？
回答by Vadim
The class NSValuehas methods +[valueWithPoint:]and -[CGPointValue]? Is this what you are looking for?
该类NSValue有方法+[valueWithPoint:]和-[CGPointValue]? 这是你想要的？
//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;
}
