Question

I use OpenGL for drawing with mouse in view. Everythings looks OK, but when i draw mouse fast it does not draws in every pixel, there shows up some spacing. I add image link here. My current mouseDragged code is very simple:

- (void) mouseDragged:(NSEvent *)event
{
    location = [self convertPoint: [event locationInWindow] fromView:self];
    NSLog(@"current location (%g,%g)\n",location.y,location.x);
    [self drawSomething];
}

Any solution for more correctly registering mouse location? Or maby some way to register currentMouseLocation and previousMouseLocation? Something like iOS function previousLocationInView:, so that i could tell OpenGL to draw line between every two points?

Answer 1

try this:

- (void) mouseDragged:(NSEvent *)event
{
    location = [self convertPoint: [event locationInWindow] fromView:self];

    NSLog(@"current location (%g,%g)\n",location.y,location.x);
    NSLog(@"previous location (%g,%g)\n",prev_location.y,prev_location.x);

    [self drawSomething];

    prev_location = location;
}