c# - Tracking mouse movement and magnitude -

i'm making simple game player controls tank. rotation of turret controlled mouse movements. code looks this:

if (game.mousestate.y < ymovementborder)    possessedturretpitchvalue += dist;  if (game.mousestate.y > ymovementborder)    possessedturretpitchvalue -= dist;  if (game.mousestate.x < xmovementborder)    possessedturretyaw += rotationdist / 6;  if (game.mousestate.x > xmovementborder)    possessedturretyaw -= rotationdist / 6; 

xmovementborder , ymovementborder values representing midpoint of game screen. problem movement of mouse cause turret turn until maximum pitch/yaw angle. how can make such able read mouse movement magnitude(ie: slight movement of mouse cause slight pitch/yaw movement of turret)?

in update method, should store references previous mouse state , current mouse state. use these 2 variables figure out how mouse moved since last update. take tweaking right, try this:

//define private variables private mousestate prevmousestate = null; private mousestate currmousestate = game.mousestate;  public void update(gametime gt) {     prevmousestate = currmousestate;     currmousestate = game.mousestate;      //calculate how mouse has moved since last update     var dx = currmousestate.x - prevmousestate.x;     var dy = currmousestate.y - prevmousestate.y;      //do rotating depending on values of dx , dy }