C language function:glRectf sample codes

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TITLE : libraries - How do I use graphics.h in Ubuntu? - Ask Ubuntu
glRectf(-0.75f,0.75f, 0.75f, -0.75f);.......
http://askubuntu.com/questions/525051/how-do-i-use-graphics-h-in-ubuntu


TITLE : openglexamples
glRectf(-25.0, -25.0, 25.0, 25.0);.......
http://cs.lmu.edu/~ray/notes/openglexamples/
TITLE : Lectures_03
glRectf(-25.0, -25.0, 25.0, 25.0);.......
http://csclab.murraystate.edu/~bob.pilgrim/515/lectures_03.html
TITLE : QOpenGLFunctions_4_3_Compatibility Class | Qt GUI 5.9
void glRectf(GLfloat x1, GLfloat y1, GLfloat x2, GLfloat y2).......
http://doc.qt.io/qt-5/qopenglfunctions-2-0.html
TITLE : QOpenGLFunctions_4_3_Compatibility Class | Qt GUI 5.9
void QOpenGLFunctions_2_0::glRectf(GLfloat x1, GLfloat y1, GLfloat x2, GLfloat y2).......
http://doc.qt.io/qt-5/qopenglfunctions-2-0.html
TITLE : QOpenGLFunctions_4_3_Compatibility Class | Qt GUI 5.9
void glRectf(GLfloat x1, GLfloat y1, GLfloat x2, GLfloat y2).......
http://doc.qt.io/qt-5/qopenglfunctions-4-3-compatibility.html
TITLE : QOpenGLFunctions_4_3_Compatibility Class | Qt GUI 5.9
void QOpenGLFunctions_4_3_Compatibility::glRectf(GLfloat x1, GLfloat y1, GLfloat x2, GLfloat y2).......
http://doc.qt.io/qt-5/qopenglfunctions-4-3-compatibility.html
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