Method onRender

Engine/source/T3D/vehicles/guiSpeedometer.cpp:153–220

----------------------------------------------------------------------------- Gui onRender method. Renders an analog speedometer needle over a specified bitmap background. */

   Renders an analog speedometer needle over a specified bitmap background.
*/
void GuiSpeedometerHud::onRender(Point2I offset, const RectI &updateRect)
{
   // Must have a connection
   GameConnection* conn = GameConnection::getConnectionToServer();
   if (!conn)
      return;

   // Requires either a vehicle control object or a vehicle-mounted player    
   Vehicle* vehicle = dynamic_cast<Vehicle*>(conn->getControlObject());
   if(!vehicle){
      Player * player = dynamic_cast<Player*>(conn->getControlObject());
      if(!player) return;
      if (!player->isMounted()) return;
      vehicle = dynamic_cast<Vehicle*>(player->getObjectMount());
      if(!vehicle) return;
   }

   Parent::onRender(offset,updateRect);

   // Use the vehicle's velocity as its speed...
   mSpeed = vehicle->getVelocity().len();
   if (mSpeed > mMaxSpeed)
      mSpeed = mMaxSpeed;

    // Calculate center point if necessary and roll in offsets
   Point2F center = mCenter;
   if (mIsZero(center.x) && mIsZero(center.y))
   {
      center.x = getExtent().x / 2.0f;
      center.y = getExtent().y / 2.0f;
   }
   F32 fillOffset = GFX->getFillConventionOffset(); // Find the fill offset
   Point2F viewCenter(offset.x + fillOffset + center.x, offset.y + fillOffset + center.y);

   // Handle rotation calculations  
   F32 rotation, spinAngle;
   rotation = mMinAngle + (mMaxAngle - mMinAngle) * (mSpeed / mMaxSpeed);
   spinAngle = mDegToRad(rotation);
   MatrixF rotMatrix(EulerF(0.0, 0.0, spinAngle));

   // Set up the needle vertex list
   Point3F vertList[5];
   vertList[0].set(+mNeedleLength,-mNeedleWidth,0);
   vertList[1].set(+mNeedleLength,+mNeedleWidth,0);
   vertList[2].set(-mTailLength  ,+mNeedleWidth,0);
   vertList[3].set(-mTailLength  ,-mNeedleWidth,0);   
   vertList[4].set(+mNeedleLength,-mNeedleWidth,0); //// Get back to the start!
   
   // Create a GFXStateBlock description if one has not been set.
   if (mBlendSB.isNull())
   {
      GFXStateBlockDesc desc;
      desc.setBlend(true, GFXBlendSrcAlpha, GFXBlendInvSrcAlpha);
      desc.samplersDefined = true;
      mBlendSB = GFX->createStateBlock(desc);
   }
   GFX->setStateBlock(mBlendSB);
   GFX->setTexture(0, NULL);