Rendering 2D Graphics - Game Development with SlimDX - page 75

{
m_Player.LastFrameChange = 0;
m_Player.AnimFrame++;
if (m_Player.AnimFrame > 7)
m_Player.AnimFrame = 0;
}
This code is fairly simple. The first line adds frameTime to the player object's
LastFrameChange variable. Remember that frameTime is the parameter of the
UpdateScene() method, and it contains the amount of time that has elapsed since
the previous frame. Next, we have an if statement that checks if the player ob-
ject's LastFrameChange variable has a value greater than 0.1 . If this is the case,
it means that it has been 1/10th of a second or more since the last time we changed
the animation frame, so we will change it again. Inside the if statement, we reset
the LastFrameChange variable to 0 , so we will know when to change the animation
frame again. The next line increments the value of the player object's AnimFrame
variable. And lastly, we have another if statement that checks if the new value of
the AnimFrame variable is too large. If it is, we reset it to a value of 0 and the anim-
ation starts all over again.
Running the game
We are almost ready to run the game, but don't forget that you need to add the Dis-
pose(bool) method. In this program, there are only four objects it needs to dispose
off.Theyare m_RenderTarget , m_Factory , m_TileSheet ,and m_DebugBrush .
Theyshouldbedisposedofinthemanagedsectionofthe Dispose(bool) method.
You can see this in the downloadable code for this chapter.
With the cleanup code in place, we are ready to run the game. As you can see, you
control a rather goofy robot. Note that the player sprites are in the Robot.png file
and the tile sheet is saved in the TileSheet.png file. Both of these files are, of
course, included with the downloadable code for this chapter. The screenshot follow-
ing the explanation shows what the game window looks like with the debug overlay
off.