;; Example 3-6 Planetary System (use gl) (use gl.glut) (define *year* 0) (define *day* 0) (define (init) (gl-clear-color 0.0 0.0 0.0 0.0) (gl-shade-model GL_FLAT) ) (define (disp) (gl-clear GL_COLOR_BUFFER_BIT) (gl-color '#f32(1.0 1.0 1.0)) (gl-push-matrix) (glut-wire-sphere 1.0 20 16) ;sun (gl-rotate *year* 0.0 1.0 0.0) (gl-translate 2.0 0.0 0.0) (gl-rotate *day* 0.0 1.0 0.0) (glut-wire-sphere 0.2 10 8) ;planet (gl-pop-matrix) (glut-swap-buffers) ) (define (reshape w h) (gl-viewport 0 0 w h) (gl-matrix-mode GL_PROJECTION) (gl-load-identity) (glu-perspective 60.0 (/ w h) 1.0 20.0) (gl-matrix-mode GL_MODELVIEW) (gl-load-identity) (glu-look-at 0.0 0.0 5.0 0.0 0.0 0.0 0.0 1.0 0.0) ) (define (keyboard key x y) (cond ((= key (char->integer #\d)) (set! *day* (modulo (+ *day* 10) 360)) (glut-post-redisplay)) ((= key (char->integer #\D)) (set! *day* (modulo (- *day* 10) 360)) (glut-post-redisplay)) ((= key (char->integer #\y)) (set! *year* (modulo (+ *year* 5) 360)) (glut-post-redisplay)) ((= key (char->integer #\Y)) (set! *year* (modulo (- *year* 5) 360)) (glut-post-redisplay)) ((= key 27) (exit 0)) )) (define (main args) (glut-init args) (glut-init-display-mode (logior GLUT_DOUBLE GLUT_RGB)) (glut-init-window-size 500 500) (glut-init-window-position 100 100) (glut-create-window *program-name*) (init) (glut-display-func disp) (glut-reshape-func reshape) (glut-keyboard-func keyboard) (glut-main-loop) 0)