Shulou(Shulou.com)06/02 Report--

This article is about how to use OpenGL to draw coordinate axis indicator map, the editor thinks it is very practical, so I share it with you to learn. I hope you can get something after reading this article.

Drawing coordinate Axis indicator Diagram with OpenGL

At first, I wanted to draw an axis in the lower left corner.

Later, I found one on the Internet, which was also carried by others, with no provenance. After studying for a while, it is not very convenient.

# include using namespace std; # include / / this N is used to count, in order to verify the two callback functions display and reshape, which executes first / / the result is that reshape first executes int N = 0 primh float transx, transy;GLfloat scale; int primw = 300 rotatex rotatex = 0, rotatey = 0 rotatex mousepx, mousepy; void rend (void) {glClear (GLint); glPointSize (8); glLineWidth (2); glPushMatrix () GlTranslatef (transx, transy, 0); / / glTranslatef (0,0,0); glRotatef (rotatex, 1,0,0); glRotatef (rotatey, 0,1,0); glBegin (GL_LINES); glColor3f (0,1,0); glVertex3f (0,0,0); glVertex3f (0,2,0); glColor3f (1,0,0); glVertex3f (0,0,0); glVertex3f (2,0,0) GlColor3f (0,0,1); glVertex3f (0,0,0); glVertex3f (0,0,2); glEnd (); glPopMatrix (); glFlush (); if (N < 3) cout

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