From 866f0ad8030ea2ceea22a4d61e6ff0006546c3fa Mon Sep 17 00:00:00 2001
From: erdgeist <>
Date: Tue, 13 May 2003 12:05:12 +0000
Subject: Here we go

---
 Vector.c | 112 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 112 insertions(+)
 create mode 100755 Vector.c

(limited to 'Vector.c')

diff --git a/Vector.c b/Vector.c
new file mode 100755
index 0000000..b29d01e
--- /dev/null
+++ b/Vector.c
@@ -0,0 +1,112 @@
+#include "Gfx.h"
+#include "Vector.h"
+
+static double rx, ry, rz;
+static int    numpts;
+static int    border;
+
+static int    startx, starty;
+
+typedef struct{
+    signed int x; signed int y; signed int z;
+    unsigned char r; unsigned char g; unsigned char b;
+}  point_3d ;
+
+static point_3d *poinz     = (void*)0;
+static point_3d *poinz_rot = (void*)0;
+
+void Vector_init( int points, int borderlen ) {
+    int i, j, k;
+    rx = ry = rz = 0;
+    numpts = points;
+    border = borderlen;
+
+    poinz     = (void*)malloc( points * points * points * sizeof( point_3d) );
+    poinz_rot = (void*)malloc( points * points * points * sizeof( point_3d) );
+
+    for( i = 0; i<points; i++)
+        for( j = 0; j<points; j++)
+            for( k = 0; k<points; k++) {
+                poinz[i+j*points+k*points*points].x = ( i * borderlen ) / ( points - 1 ) - ( borderlen >> 1);
+                poinz[i+j*points+k*points*points].y = ( j * borderlen ) / ( points - 1 ) - ( borderlen >> 1);
+                poinz[i+j*points+k*points*points].z = ( k * borderlen ) / ( points - 1 ) - ( borderlen >> 1);
+                poinz[i+j*points+k*points*points].r = 255;
+                poinz[i+j*points+k*points*points].g = 255;
+                poinz[i+j*points+k*points*points].b = 0;
+            }
+}
+
+void Vector_destroy( ) {
+    if( poinz )
+        free( poinz );
+    if( poinz_rot )
+        free( poinz_rot );
+}
+
+void Vector_reset( void ) {
+    rx = 0; ry = 0; rz = 0;
+}
+
+void Vector_angle( double dx, double dy, double dz ) {
+    rx += dx, ry += dy, rz += dz;
+}
+
+void Vector_move( signed int dx, signed int dy ) {
+    double rotation[3][3] = {
+        { cos(-ry)*cos(-rz), -cos(-rx)*sin(-rz)+sin(-rx)*sin(-ry)*cos(-rz),  sin(-rx)*sin(-rz)+cos(-rx)*sin(-ry)*cos(-rz) },
+        { cos(-ry)*sin(-rz),  cos(-rx)*cos(-rz)+sin(-rx)*sin(-ry)*sin(-rz), -sin(-rx)*cos(-rz)+cos(-rx)*sin(-ry)*sin(-rz) },
+        {-sin(-ry),                             sin(-rx)*cos(-ry)         ,                    cos(-rx)*cos(-ry)          }
+    };
+
+    int xold = rotation[0][2] * border;
+    int yold = rotation[1][2] * border;
+    int zold = rotation[2][2] * border;
+
+    int xnew = rotation[0][0] * dx + rotation[0][1] * dy + rotation[0][2] * border;
+    int ynew = rotation[1][0] * dx + rotation[1][1] * dy + rotation[1][2] * border;
+    int znew = rotation[2][0] * dx + rotation[2][1] * dy + rotation[2][2] * border;
+
+    rx += 0.01 * (xold - xnew);
+    ry += 0.01 * (yold - ynew);
+    rz += 0.01 * (zold - znew);
+}
+
+static int compare_points( const void *a, const void *b) {
+    return ((point_3d*)b)->z - ((point_3d*)a)->z ;
+}
+
+void Vector_paint( void ) {
+    double rotation[3][3] = {
+        {         cos(ry)*cos(rz)                 ,         -cos(ry)*sin(rz)                 ,          sin(ry) },
+        { sin(rx)*sin(ry)*cos(rz)+cos(rx)*sin(rz) , -sin(rx)*sin(ry)*sin(rz)+cos(rx)*cos(rz) , -sin(rx)*cos(ry) },
+        {-cos(rx)*sin(ry)*cos(rz)+sin(rx)*sin(rz) ,  cos(rx)*sin(ry)*sin(rz)+sin(rx)*cos(rz) ,  cos(rx)*cos(ry) }
+    };
+    int i;
+
+    for( i = 0; i < numpts*numpts*numpts; i++) {
+        poinz_rot[i].x = (rotation[0][0] * poinz[i].x + rotation[0][1] * poinz[i].y + rotation[0][2] * poinz[i].z)*65536;
+        poinz_rot[i].y = (rotation[1][0] * poinz[i].x + rotation[1][1] * poinz[i].y + rotation[1][2] * poinz[i].z)*65536;
+        poinz_rot[i].z =  rotation[2][0] * poinz[i].x + rotation[2][1] * poinz[i].y + rotation[2][2] * poinz[i].z;
+//        poinz_rot[i].r = poinz[i].r; poinz_rot[i].g = poinz[i].g; poinz_rot[i].b = poinz[i].b;
+        poinz_rot[i].r = random(); poinz_rot[i].g = random(); poinz_rot[i].b = random();
+    }
+
+    /* Sort by z-order */
+    qsort( poinz_rot, numpts*numpts*numpts, sizeof(point_3d), compare_points);
+
+    Gfx_clear();
+
+    for( i = 0; i < numpts*numpts*numpts; i++) {
+        int size;
+        poinz_rot[i].x /= poinz_rot[i].z + 1.5*border;
+        poinz_rot[i].y /= poinz_rot[i].z + 1.5*border;
+        poinz_rot[i].x >>= 8;
+        poinz_rot[i].y >>= 8;
+        poinz_rot[i].x += g_width>>1;
+        poinz_rot[i].y += g_height>>1;
+
+        size = 10 * border / ( (poinz_rot[i].z) + border );
+
+        Gfx_kuller( poinz_rot[i].x-(size>>1), poinz_rot[i].y-(size>>1), size, poinz_rot[i].r, poinz_rot[i].g, poinz_rot[i].b);
+    }
+}
-- 
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