void circle(float x, float y, float r, uint32_t color) { olPushMatrix(); olPushColor(); olMultColor(color); olTranslate(x, y); olRotate((x+y)*123); /*olBegin(OL_BEZIERSTRIP); olVertex(0, r, color); int i; for (i=0; i<2; i++) { olVertex(CP*r, r, C_WHITE); olVertex(r, CP*r, C_WHITE); olVertex(r, 0, C_WHITE); olVertex(r, -CP*r, C_WHITE); olVertex(CP*r, -r, C_WHITE); olVertex(0, -r, C_WHITE); olVertex(-CP*r, -r, C_WHITE); olVertex(-r, -CP*r, C_WHITE); olVertex(-r, 0, C_WHITE); olVertex(-r, CP*r, C_WHITE); olVertex(-CP*r, r, C_WHITE); olVertex(0, r, C_WHITE); }*/ /* olVertex(0, r, color); olVertex(0, r, color); olVertex(r*0.1, r, color); olVertex(r*0.1, r, color);*/ float circum = 2 * M_PI * r; int segments = circum / (1/30.0); if (segments < 50) segments = 50; int i; olBegin(OL_POINTS); olVertex(r, 0); for (i=0; i<=(2*segments+10); i++) { float w = i * M_PI * 2.0 / segments; uint32_t c = C_WHITE; if (i > 2*segments) c = C_GREY((10-(i-segments)) * 28); else if (i < 3) c = C_GREY(i * 85); olVertex(r*cosf(w), r*sinf(w)); } olEnd(); olPopColor(); olPopMatrix(); }
static VALUE ol_rotate(VALUE self, VALUE v) { olRotate(NUM2DBL(v)); return Qnil; }