68 lines
1.1 KiB
C++
68 lines
1.1 KiB
C++
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#include <windows.h>
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#include <GL/glu.h>
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#ifdef X11
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#include <GL/glx.h>
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#endif
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#include <math.h>
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#ifdef WIN32
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#include "stonehen.h"
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#endif
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#include "Roundwal.h"
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Roundwall::Roundwall()
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{
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height = 2;
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radius = 20;
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divisions = 20;
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sint = cost = NULL;
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}
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void Roundwall::draw()
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{
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float texx = 0;
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int i;
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if (sint == NULL) compute_tables();
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glBegin(GL_QUAD_STRIP);
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for (i = 0; i <= divisions; i++, texx += 1.) {
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glTexCoord2f(texx, 0);
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glNormal3f(-cost[i], -sint[i], 0);
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glVertex3f(radius * cost[i], radius * sint[i], 0);
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glTexCoord2f(texx, 1);
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glVertex3f(radius * cost[i], radius * sint[i], height);
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}
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glEnd();
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}
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void Roundwall::set_divisions(int d)
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{
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if (divisions != d) delete_tables();
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divisions = d;
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}
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void Roundwall::delete_tables()
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{
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delete sint;
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delete cost;
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sint = cost = NULL;
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}
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void Roundwall::compute_tables()
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{
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int i;
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float t, dt;
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delete_tables();
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cost = new float[divisions + 1];
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sint = new float[divisions + 1];
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dt = 2. * M_PI / divisions;
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for (i = 0, t = 0.; i <= divisions; i++, t += dt) {
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cost[i] = cos(t);
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sint[i] = sin(t);
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}
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}
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