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copied!<p>You need to set the projection matrix inside the reshape function (<code>resize()</code>), which also automatically solves the problem of the user resizing the window:</p> <pre><code>void resize(int w, int h) { glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluOrtho2D(0, w, h, 0); } </code></pre> <p>And then in your draw function, make sure that the matrix mode is model-view:</p> <pre><code>void draw() { glMatrixMode(GL_MODELVIEW); glLoadIdentity(); ... } </code></pre> <p>Other problems with your code:</p> <ul> <li>You probably shouldn't be calling <code>glutPostRedisplay()</code> at the end of <code>draw()</code>. This is going to make your CPU run at 100%. You can instead use <code>glutTimerFunc()</code> to still have updates every some number of milliseconds.</li> <li>In <code>processMouse()</code>, you're using <code>wsprintf()</code> on an array of <code>char</code>s: <code>wsprintf()</code> takes an array of wide characters (<code>wchar_t</code>), so you should make the local variable <code>s</code> of type <code>wchar_t[]</code>, or use <code>sprintf()</code> and <code>MessageBoxA()</code> instead of <code>wsprintf()</code> and <code>MessageBoxW()</code> (to which <code>MessageBox()</code> expands as a macro when compiling a Unicode application, which I'm assuming you're doing). You're also vulnerable to a buffer overflow -- you should use a buffer of at least 12 characters, even though realistically you'll never be passed a very large <code>x</code> value. Finally, you should also use <code>snprintf()/wsnprintf()</code> instead of <code>sprintf()/wsprintf()</code> to protect against the buffer overflow.</li> </ul>

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