Values wont stay negative

[vastrolorde]

I have a function that rotates a vector 90 degrees. Only problem is, i never get negative values. For some strange reason, no matter what i do, the value of x is positive. And even if the x is negative. Once i put it into direction (struct with 2 values x and y) it turns again to positive. Im using VSC++2013 ultimate. Can anyone tell me what is causing this strange problem. At first direction was SDL_Point, so i thought it was SDL problem, but now it seems its something else.

		if (c == '-')
		{
			int x =  direction.y;
			x *= -1;
			int y = direction.x;
			direction = { x, y };
		}

[MiiNiPaa]

what is direction? How y and x are declared?

[vastrolorde]

Direction just tells which way to move next. it should have 4 states. (0,5) (5,0) (0,-5) (-5,0)

typedef struct Point{
int x;
int y;
}Point;

Point direction;

[MiiNiPaa]

Code should work fine. Try placing breakpoint inside this if statement. I think that execution does not run these statements at all. Mayby problem is with your conditions?

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#include <iostream> struct Point { int x; int y; }; int main() { Point direction {5, 1}; int x = direction.y; x *= -1; int y = direction.x; direction = { x, y }; std::cout << direction.x << ' ' << direction.y; }

-1 5

[vastrolorde]

So i made it like this. Its inside the if statement. Since it gets printed out, the condition is initialized. But i always get positive values. I have another if statement like this. It turns the other way and it seems to be working fine. I get occasional negative values from there.

int x =  direction.y * -1;
			cout << x;

[MiiNiPaa]

Are you sure that both those statements are not execute at the same time negating each other?

Can you post minimal code example which reprodices problem?

[vastrolorde]

Oh ok... I found the problem. The problem was elsewhere. The list of commands it uses to doe the flips, it has faults in it. Need to fix that

[dhayden]

This code looks okay to me. I notice that the code does NOT rotate the angle. It reflects it about the Y axis. So I suspect the problem is elsewhere. Can you post the full rotation code?

[MiiNiPaa]

It rotates point 90° counterclockwise around point [0; 0]. Everything is correct here.