OpenGL path (4) Self-made graphic functions (cube, cylindrical, and conical)

Labels: OpenGL graphics

# Include <Gl/glut. h> # include <Gl/Glu. h> # include <Gl/GL. h> # pragma comment (Lib, "opengl32.lib") # pragma comment (Lib, "glu32.lib") # pragma comment (Lib, "glu32.lib") # pragma comment (Lib, "glut. lib ") # include <math. h> void cube () {glbegin (1.0); // fill in the convex polygon glvertex3f (0.0f, 0.0f, 0.0f); glvertex3f (0.0f, 1.0f, 0.0f); glvertex3f (1.0f, 0.0f, 0.0f); glvertex3f (1.0f, 1.0f, 0.0f); glvertex3f (1.0f, 0.0f,-1.0f); GLV Ertex3f (1.0f, 1.0f,-1.0f); glvertex3f (0.0f, 0.0f,-1.0f); then (0.0f, 1.0f,-1.0f); glvertex3f (0.0f, 0.0f, 0.0f ); values (0.0f, 1.0f, 0.0f); glend (); glbegin (values); glvertex3f (0.0f, 0.0f, 0.0f); values (1.0f, 0.0f, 0.0f); glvertex3f (0.0f, 0.0f,-1.0f); glvertex3f (1.0f, 0.0f,-1.0f); then (0.0f, 1.0f, 0.0f); then (1.0f, 1.0f, 0.0f); glvertex3f (0.0f, 1.0f, -1.0f); glvertex3f (1.0f, 1. 0f,-1.0f); glend ();} void circle () {glbegin (gl_triangle_fan); // slice continuously filled triangle string glvertex3f (0.0f, 0.0f, 0.0f ); int I = 0; for (I = 0; I <= 390; I ++ = 15) {float P = I * 3.14/180; glvertex3f (sin (P ), cos (P), 0.0f);} glend ();} void cylinder () {glbegin (gl_quad_strip); // continuously populate the Quadrilateral string int I = 0; for (I = 0; I <= 390; I + = 15) {float P = I * 3.14/180; glvertex3f (sin (P), cos (P ), 1.0f); glvertex3f (sin (P), cos (P), 0.0f);} glend (); Circle (); gltranslatef (0, 0, 1); Circle ();} void cone () {glbegin (gl_quad_strip); // consecutively filled quadrilateral string int I = 0; for (I = 0; I <= 390; I + = 15) {float P = I * 3.14/180; glvertex3f (0, 0, 1.0f ); glvertex3f (sin (P), cos (P), 0.0f);} glend (); Circle ();} void renderscene (void) {static float I = 0; I + = 0.1; if (I> 360) I = 0; glclear (gl_color_buffer_bit | gl_depth_buffer_bit); glloadidentity (); glpushmatrix (); glcolor3f (0, 1, 0); GL Translatef (-2, 2.0,-12); glrotatef (I, 1, 1, 1); cylinder (); glpopmatrix (); glpushmatrix (); glcolor3f (1, 0, 0); gltranslatef (2, 2,-12); glrotatef (I, 1, 1, 1); Circle (); glpopmatrix (); glpushmatrix (); glcolor3f (0, 1, 1); gltranslatef (-2,-2,-12); glrotatef (I, 1, 1, 1); cube (); glpopmatrix (); glpushmatrix (); glcolor3f (1, 1, 0); gltranslatef (2,-2,-12); glrotatef (I, 1, 1, 1); cone (); glpopmatrix (); gluswapbuffers ();} V Oid changesize (int w, int h) {// prevents the divisor (that is, the height is 0) // (you can set the window width to 0 ). if (H = 0) H = 1; float ratio = 1.0 * W/H; // unitized projection matrix. Glmatrixmode (gl_projection); glloadidentity (); // you can specify the window size as glviewport (0, 0, W, h). // set the correct projection matrix gluperspective (45, ratio, 1, 1000); // The following is the set model view matrix glmatrixmode (gl_modelview); glloadidentity (); glulookat (0.0, 0.0, 5.0, 0.0, 0.0,-1.0, 0.0f, 1.0f, 0.0f); // set the observation point} int main (INT argc, char * argv []) {gluinit (& argc, argv ); fig ); // call the function glureshapefunc (changesize) when the specified program is idle; // specify the callback function glable (gl_depth_test) when the window shape changes; glumainloop (); Return 0 ;}

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OpenGL path (4) Self-made graphic functions (cube, cylindrical, and conical)