Super Simple Text Speedometer for T3D

1. Create the file "guiTextSpeedometer.cpp" in T3D/vehicles.
2. Insert all of the following code.
3. Salt to taste, compile and enjoy.

#include "gui/core/guiControl.h"
#include "gui/controls/guiTextCtrl.h"
#include "T3D/gameBase/gameConnection.h"
#include "T3D/vehicles/vehicle.h"
#include "console/consoleTypes.h"

class GuiTextSpeedometerCtrl : public GuiTextCtrl
{
private:
   typedef GuiTextCtrl Parent;

   char txtBuf[1024];
   F32 scaleFactor; ///< Number to multiply speed by

public:
   GuiTextSpeedometerCtrl();
   static void initPersistFields();

   DECLARE_CONOBJECT(GuiTextSpeedometerCtrl);
   DECLARE_CATEGORY( "Gui Text" );
   DECLARE_DESCRIPTION( "A control that displays control object speed in text format." );

   void onPreRender();
};

IMPLEMENT_CONOBJECT(GuiTextSpeedometerCtrl);

GuiTextSpeedometerCtrl::GuiTextSpeedometerCtrl()
{
   scaleFactor = 2.23693629f; //MPH. would be 3.6 for kph
}

void GuiTextSpeedometerCtrl::initPersistFields()
{
   addField("scaleFactor", TypeF32, Offset( scaleFactor, GuiTextSpeedometerCtrl ),
      "Conversion factor to multiply meter / second speed by. Defaults to 2.23"
      "(mph). For kph it would be 3.6" );

   Parent::initPersistFields();
}

void GuiTextSpeedometerCtrl::onPreRender()
{
   Parent::onPreRender();

   setText();

   // Must have a connection and player control object
   GameConnection* conn = GameConnection::getConnectionToServer();
   if (!conn)
      return;
   Vehicle* control = dynamic_cast<Vehicle*>(conn->getControlObject());
   if (!control)
      return;

   // That number before the f controls how many decimal places are displayed
   // It could be put into a variable using .* ie
   // dSprintf(txtBuf, 1023, "%.*f", precision, control->getVelocity().len()*scaleFactor);
   // (precision would have to be an int)
   dSprintf(txtBuf, 1023, "%.1f", control->getVelocity().len()*scaleFactor);

   setText(txtBuf);
}