85 lines
1.9 KiB
C
85 lines
1.9 KiB
C
#include "space.h"
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#include "camera.h"
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#include <gint/std/stdlib.h>
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#include <gint/std/string.h>
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double fe_matrix[3][3]=
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{
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{0,0,0},
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{0,0,0},
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{0,0,0}
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};
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fe_ipoint fe_translate_delta;
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static double reducted_cos(const double a)
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{
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double u= 1.0;
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const double a2 = a * a;
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for(int32_t p = 17; p>=1; p -= 2)
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u = 1 - a2 / (p * p + p) * u;
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return u;
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}
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// return a with -pi<=a<pi
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double fe_modulo_2pi(double a)
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{
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while (a<=-pi)
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a += pi2;
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while (a>pi)
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a -= pi2;
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return a;
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}
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double fe_cos(double angle)
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{
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angle = fe_modulo_2pi(angle);
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if (angle<0)
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angle=-angle;
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if (angle>=pi_sur_2)
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return -reducted_cos(angle - pi);
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return reducted_cos(angle);
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}
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double fe_sin(double angle)
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{
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return fe_cos(angle - pi_sur_2);
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}
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#define sgn(x) (x>=0?x:-x)
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void fe_vertex_translate(fe_ivertex * v)
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{
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static fe_ipoint temp;
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temp.x = v->real.x - fe_translate_delta.x;
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temp.y = v->real.y - fe_translate_delta.y;
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temp.z = v->real.z - fe_translate_delta.z;
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v->translated.x = (double)(fe_matrix[0][0]*(double)temp.x + fe_matrix[0][1]*(double)temp.y + fe_matrix[0][2]*(double)temp.z);
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v->translated.z = (double)(fe_matrix[1][0]*(double)temp.x + fe_matrix[1][1]*(double)temp.y + fe_matrix[1][2]*(double)temp.z);
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v->translated.y = (double)(fe_matrix[2][0]*(double)temp.x + fe_matrix[2][1]*(double)temp.y + fe_matrix[2][2]*(double)temp.z);
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//v->translated.x*=10;
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//v->translated.y*=10;
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v->translated.x*=64;
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v->translated.y*=64;
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if (v->translated.z>0)
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{
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v->translated.x/=v->translated.z;
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v->translated.y/=v->translated.z;
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}
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else
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{
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v->translated.x*=32768*sgn(v->translated.z);
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v->translated.y*=32768*sgn(v->translated.z);
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}
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//(v->translated.x*1024)/v->translated.z;
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//(v->translated.y*1024)/v->translated.z;
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v->translated.x+=fe_x_mid;
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v->translated.y+=fe_y_mid;
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}
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