FPS-like movement

Scripting Issues
1

Hi all !

In my program, you use a FPS-like movement to move around. It works (and it works well) but there is a tiny bug left. I activate the mouse-guided rotation of the camera by right clicking, and depending on where this right click is done, I see the camera rotating although the mouse is not moving at all. I suspect there is a rounding error, but I can’t find a way to make it disappear.

Here is the code I use :

# init
props = base.win.getProperties()
self.windowSizeX = props.getXSize()
self.windowSizeY = props.getYSize()
self.windowCenterX = self.windowSizeX / 2
self.windowCenterY = self.windowSizeY / 2   
self.rotationSpeed = 40
# getting current cursor position

mouseX = base.mouseWatcherNode.getMouseX()
mouseY = base.mouseWatcherNode.getMouseY()

dtheta = (self.oldMouseX - mouseX) * self.rotationSpeed
dphi = (mouseY - self.oldMouseY) * self.rotationSpeed

# replacing the cursor at its stored position
# when I right click, self.oldMouseX and self.oldMouseY take values contained in base.mouseWatcherNode.getMouseX/Y
base.win.movePointer(0,int(self.windowCenterX * (1+self.oldMouseX)),int(self.windowCenterY * (1 - self.oldMouseY)))

# updating camera position

theta = base.camera.getH()
phi = base.camera.getP()
base.camera.setHpr(theta + dtheta,phi + dphi,0)

Any idea ?

2

try base.win.getXSize() and base.win.getYSize() instead of using WindowProperties.

3

It does not change anything.

I think that I know where the error is. I believe that if I do not reposition the mouse afterwards, there will be no problem. The line with all the ‘int’ seems to be the troublemaker.

4

If you do not reposition the mouse back to the center of the screen your cursor will leave the screen when in window mode.

5

I know that. I just wanted to point out the fact that the repositionning is responsible for my trouble.

Is there a way to set the mouse position with the same coordinate system as the one used when you get the mouse position ?

6

Do it the other way round: get mouse position in the same CS as the one you use for setting the mouse.

md = base.win.getPointer( 0 )
x = md.getX( )
y = md.getY( )
if base.win.movePointer( 0, x, y ): ...

Both are pixel coordinates, that is integers in the range of (0,0) to (800,600) or whatever resolution you use.

enn0x

7

Thanks ! It works fine.