1 files changed, 96 insertions, 0 deletions
diff --git a/instructables/cube_pc/draw_3d.c b/instructables/cube_pc/draw_3d.c
new file mode 100644
index 0000000..c3201d9
--- /dev/null
+++ b/instructables/cube_pc/draw_3d.c
@@ -0,0 +1,96 @@
+#include "draw_3d.h"
+#include <math.h>
+
+
+vertex point_rotate_around_point (vertex point, vertex center, float rotation_x, float rotation_y, float rotation_z)
+{
+	float x, y, z;
+	float sx,cx, sy,cy, sz,cz;
+	float xy,xz, yx,yz, zx,zy;
+	vertex newpoint;
+
+	// Center all the points around 0,0,0
+	x = point.x - center.x;
+	y = point.y - center.y;
+	z = point.z - center.z;
+
+	// Precalculate sinus and cosinus for each axis rotation
+	sx = sin(rotation_x);
+	cx = cos(rotation_x);
+
+	sy = sin(rotation_y);
+	cy = cos(rotation_y);
+
+	sz = sin(rotation_z);
+	cz = cos(rotation_z);
+
+
+	// Rotation around x
+	xy = cx*y - sx*z;
+	xz = sx*y + cx*z;
+	
+	// Rotation around y
+	yz = cy*xz - sy*x;
+	yx = sy*xz + cy*x;
+	
+	// Rotation around z
+	zx = cz*yx - sz*xy;
+	zy = sz*yx + cz*xy;
+
+	newpoint.x = zx + center.x;
+	newpoint.y = zy + center.y;
+	newpoint.z = yz + center.z;
+
+
+	return newpoint;
+}
+
+
+// Calculate all 8 corners of a cube.
+void calculate_cube_corners (vertex pnt[8], vertex center, float size)
+{
+
+	// Distance from center on any axis.
+	float dist = size/2;
+
+	// Points
+	// X				Y				Z
+
+	pnt[0].x = center.x+dist;	pnt[0].y = center.y+dist;	pnt[0].z = center.z+dist;	// 0 right, front, upper
+	pnt[1].x = center.x-dist;	pnt[1].y = center.y+dist;	pnt[1].z = center.z+dist;	// 1 left, front, upper
+	pnt[2].x = center.x+dist;	pnt[2].y = center.y-dist;	pnt[2].z = center.z+dist;	// 2 right, back, upper
+	pnt[3].x = center.x-dist;	pnt[3].y = center.y-dist;	pnt[3].z = center.z+dist;	// 3 left, back, uppper
+	pnt[4].x = center.x+dist;	pnt[4].y = center.y+dist;	pnt[4].z = center.z-dist;	// 4 right, front, lower
+	pnt[5].x = center.x-dist;	pnt[5].y = center.y+dist;	pnt[5].z = center.z-dist;	// 5 left, front, lower
+	pnt[6].x = center.x+dist;	pnt[6].y = center.y-dist;	pnt[6].z = center.z-dist;	// 6 right, back, lower
+	pnt[7].x = center.x-dist;	pnt[7].y = center.y-dist;	pnt[7].z = center.z-dist;	// 7 left, bakc, lower
+
+
+}
+
+void draw_cube_wireframe (vertex pnt[8])
+{
+	int i;
+	
+	// upper "lid"
+	line_3d ((int)pnt[0].x,(int)pnt[0].y,(int)pnt[0].z,(int)pnt[1].x,(int)pnt[1].y,(int)pnt[1].z);
+	line_3d ((int)pnt[2].x,(int)pnt[2].y,(int)pnt[2].z,(int)pnt[3].x,(int)pnt[3].y,(int)pnt[3].z);
+	line_3d ((int)pnt[1].x,(int)pnt[1].y,(int)pnt[1].z,(int)pnt[3].x,(int)pnt[3].y,(int)pnt[3].z);
+	line_3d ((int)pnt[2].x,(int)pnt[2].y,(int)pnt[2].z,(int)pnt[0].x,(int)pnt[0].y,(int)pnt[0].z);
+
+	// lower "lid"
+	line_3d ((int)pnt[4].x,(int)pnt[4].y,(int)pnt[4].z,(int)pnt[5].x,(int)pnt[5].y,(int)pnt[5].z);
+	line_3d ((int)pnt[6].x,(int)pnt[6].y,(int)pnt[6].z,(int)pnt[7].x,(int)pnt[7].y,(int)pnt[7].z);
+	line_3d ((int)pnt[5].x,(int)pnt[5].y,(int)pnt[5].z,(int)pnt[7].x,(int)pnt[7].y,(int)pnt[7].z);
+	line_3d ((int)pnt[6].x,(int)pnt[6].y,(int)pnt[6].z,(int)pnt[4].x,(int)pnt[4].y,(int)pnt[4].z);
+
+	// side walls
+	line_3d ((int)pnt[0].x,(int)pnt[0].y,(int)pnt[0].z,(int)pnt[4].x,(int)pnt[4].y,(int)pnt[4].z);
+	line_3d ((int)pnt[1].x,(int)pnt[1].y,(int)pnt[1].z,(int)pnt[5].x,(int)pnt[5].y,(int)pnt[5].z);
+	line_3d ((int)pnt[2].x,(int)pnt[2].y,(int)pnt[2].z,(int)pnt[6].x,(int)pnt[6].y,(int)pnt[6].z);
+	line_3d ((int)pnt[3].x,(int)pnt[3].y,(int)pnt[3].z,(int)pnt[7].x,(int)pnt[7].y,(int)pnt[7].z);
+
+}
+
+
+