CODEWITHSUNDEEP
c++openglmouseeventglut
Weaver
Weaver

Reputation: 174

OpenGL GLUT left mouse click overrides holding right mouse

I'm adapting some skeleton code to learn how OpenGL works and have in SphericalCameraManipulator.cpp which allows me to pan and tilt the camera while I hold down right mouse:

void SphericalCameraManipulator::handleMouseMotion(int x, int y)
{
    //Motion
    float xMotion = (float)x - previousMousePosition[0];
    float yMotion = (float)y - previousMousePosition[1];

    if(reset)
    {
        xMotion = yMotion = 0.0;
        reset = false;
    }

    this->previousMousePosition[0] = (float)x;
    this->previousMousePosition[1] = (float)y;

    //Right Button Action
    if(this->currentButton == GLUT_RIGHT_BUTTON && this->currentState == GLUT_DOWN)
    {
        this->pan  -= xMotion*this->panTiltMouseStep ;
        this->tilt += yMotion*this->panTiltMouseStep ;
    }

    //Enforce Ranges
    this->enforceRanges();
}

I deleted the left mouse action as I don't want it to control the camera, and it now actions a command in the main code body. 

//Left Button Action
if(button == GLUT_LEFT_BUTTON && state == GLUT_DOWN)
    {
        ...   //game action
    }

My problem is that when I click the left mouse, the press of the right mouse is cancelled, and I must release and repress the right mouse to continue controlling the camera.

Is there a way to prevent this from happening? It interrupts the flow of the game. I'm using GLUT

Upvotes: 0

Views: 1477

Answers (1)

Weaver
Weaver

Reputation: 174

Rabbid76's comment saying there is no mouse hold event set me on the right path.

I wrote a small function that simply recorded the last state of mouse button 2 (the 'camera look around' button):

void SphericalCameraManipulator::handleMouse(int button, int state)
{
    this->currentButton = button;
    this->currentState  = state;

    //to enable mouse look around
    if (this->currentButton == 2) //right mouse
        this->lastLookState = this->currentState;

    if(this->currentState == GLUT_UP)
    {
        reset = true;
    }
}

This mean even when the current state was regarding the left mouse button (game action) it was still possiblew to look around since a 'mouse two button up' event had not occured:

this->currentButton = 2;
this->currentState  = 1;

Upvotes: 1

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