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📁 2D游戏引擎hge的代码
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<h1 style="margin-top:0px">Tutorial 01 - Minimal HGE application</h1>
<p>
<b>F</b>irst, we include <b>hge.h</b> header and declare a variable to store the <b>HGE</b> interface pointer to:
</p>
<pre>
#include &lt;hge.h&gt;

HGE *hge = 0;
</pre>
<p>
Then we create our frame function. The frame function is a user-defined function
that will be called by <b>HGE</b> once per frame: put your game loop code here.
When the frame function returns <b>true</b>, the <b>HGE</b> stops execution of game loop.
<br><br>
In this example we just check whether ESC key has been pressed:
</p>
<pre>
bool FrameFunc()
{
  if (hge->Key_GetState(HGEK_ESCAPE)) return true;
  return false;
}
</pre>
<p>
The <b>WinMain</b> function is a standard windows application entry point.
Here we'll obtain a pointer to <b>HGE</b> interface to access <b>HGE</b> functions.
In this example we use global pointer to <b>HGE</b> interface.
Instead you may use <a href="hgefunc_interfaceget.html">hgeCreate</a>
function every time you need access to <b>HGE</b>. Just be sure to
have a corresponding <a href="hgefunc_interfacerelease.html">Release</a>
call for each call to <a href="hgefunc_interfaceget.html">hgeCreate</a>.
</p>
<pre>
int WINAPI WinMain(HINSTANCE, HINSTANCE, LPSTR, int)
{
  hge = hgeCreate();
</pre>
<p>
Then we set some internal <b>HGE</b> system states to configure the environment.
Although most of the system states have appropriate defaults, at least
<a href="hgeconst_systemstate.html#HGE_FRAMEFUNC">HGE_FRAMEFUNC</a> must be set before calling <a href="hgefunc_systemstart.html">System_Start</a>.
</p>
<pre>
  hge->System_SetState(HGE_FRAMEFUNC, FrameFunc);
  hge->System_SetState(HGE_WINDOWED, true);
  hge->System_SetState(HGE_USESOUND, false);
  hge->System_SetState(HGE_TITLE,
                 "HGE Tutorial 01 - Minimal HGE application");
</pre>
<p>
Now we initiate <b>HGE</b> with the states set.
If something goes wrong, the <a href="hgefunc_systeminitiate.html">System_Initiate</a>
function returns <b>false</b> and more specific description of what have
happened can be read with <a href="hgefunc_systemgeterror.html">System_GetErrorMessage</a>.
<br><br>
Having <b>HGE</b> initiated we start the game loop with call to the <a href="hgefunc_systemstart.html">System_Start</a> function.
The execution "stops" here until <b>true</b> is returned from the frame function.
</p>
<pre>
  if(hge->System_Initiate())
  {
    hge->System_Start();
  }
  else
  {	
    MessageBox(NULL, hge->System_GetErrorMessage(), "Error",
               MB_OK | MB_ICONERROR | MB_SYSTEMMODAL);
  }
</pre>
<p>
Now <b>ESC</b> has been pressed or the user has closed the window by other means.
We should restore video mode and free all allocated resources.
Also we should release the <b>HGE</b> interface:
</p>
<pre>
  hge->System_Shutdown();
  hge->Release();

  return 0;
}
</pre>
<p>
Voila! Just about 20 lines of code and we have fully functional and running environment for a
game!
<br><br>
The complete source code with detailed comments for this tutorial you may find in the folder
<b>tutorials\tutorial01</b>.
</p>
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