sf::Mouse::getPosition(*window) is returning the wrong location.

[chrisciscoioio]

I am going to start this off with I am sure I am missing something, but I am not sure what.

sf::Vector2i pos = sf::Mouse::getPosition(*window); doesnt seem to be returning the correct y value, the x value appears right however, I have attached an image that shows where my mouse is when clicked compared with where the point appears.

[attachment deleted by admin]

[FRex]

The image tells nothing..I don't get your problem, remember that it returns pixels not coords and that y is positive the lower cursor is.

[G.]

The top left corner is at (0, 0).

[chrisciscoioio]

If I click on the black dot it creates a point at the green dot.

I guess this is because I am rendering in OpenGL, and just using SFML for windows and input.

How can I transform the one set of coords into the other?

[codecranker]

I think its because of the confusion between local coordinates vs world coordinates. If you are using sf::Sprite, you can use Sprite.TransformToGlobal or Sprite.TransformToLocal to convert your coordinates.

[chrisciscoioio]

I am not using sf::Sprite.

I think that is the issue, I am just not sure how to fix it, sf::Sprite is not an option.

[codecranker]

what are you using then, if not sf::Sprite?

if you are using opengl, then I guess you have to apply the right transformations to your GL_MODELVIEW matrix at the right place i.e before you issue your draw commands. you can refer to the documentation of glLoadMatrix(), glLoadIdentity(), glPushMatrix() and glPopMatrix(). These methods will come handy.

[chrisciscoioio]

Drawing is fine, this is an issue I am having integrating SFML with OpenGL to get world coords.

What I don't have is converting the sf::mouse position to world coords. Everything else already works as long as I can get the correct coords.

Right now on my screen, the x works fine, because I am not moving the camera, but the y value is off, if I am above the mid line of the screen it is below it, and if I am below the mid line it is above it.

[codecranker]

aha ok.
so the coordinate system is reversed I guess. you have to apply correction to your y-value. If I understood correctly, it seems like the mid line is somehow corresponds to the center of the screen. If your x-value is good, then simply negating the y-value should solve the problem. Otherwise, may be you can try the following:

SFML- top-left = (0, 0). mouse position should be relative to this.
w, h = screen width, screen height
assuming your (0, 0) is (w/2, h/2). screen center = your camera center. (this is my assumption).

you can apply correction to your mouse_x and mouse_y
mouse_x = mouse_x - w/2
mouse_y = mouse_y - h/2

if your center is different you can apply correction to your received mouse coordinates accordingly.

[chrisciscoioio]

That doesn't actually work but I played with a variety of systems, and I found one that solves this, baring any camera movement which I would have to adjust by.

But if I take the screenHeight and minus the pos.y it will work.