OpenGL: How to drag image and move it to the line by using the mouse

OpenGL: How to drag image and move it to the line by using the mouse

References

Reference NO 1

http://stackoverflow.com/questions/15197858/opengl-how-to-drag-image-and-move-it-to-the-line-by-using-the-mouse

Reference NO 2

http://stackoverflow.com/questions/14651945/how-to-make-a-draggable-object-with-opengl

Reference NO 3

https://www.cs.umd.edu/class/spring2013/cmsc425/OpenGL/OpenGLSamples/OpenGL-3D-Sample/OpenGL-3D-Sample-ForC/opengl-3D-sample.c

Reference NO 4

http://hohohuhu.blogspot.com/2011/03/opengl-moving-triangle-with-mouse.html

Reference NO 5

http://www.opengl-tutorial.org/beginners-tutorials/tutorial-6-keyboard-and-mouse/

Reference NO 6

http://users.polytech.unice.fr/~buffa/cours/synthese_image/DOCS/trant.sgi.com/opengl/examples/more_samples/more_samples.html

Reference NO 7

http://www.codeproject.com/Articles/199525/Drawing-nearly-perfect-2D-line-segments-in-OpenGL

Reference NO 8

http://www.bfilipek.com/2012/06/select-mouse-opengl.html