drawbbox.c

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/*
        This file is provided as a debugging aid.  It contains code for drawing an axial
        aligned bounding box.  You can use this code as you see fit.
*/

static  void    DrawFace(geWorld *World, const geVec3d **Verts)
{
        GE_LVertex      LVerts[4];
        int                     i;

        for     (i = 0; i < 4; i++)
        {
                LVerts[i].r = 40.0f;
                LVerts[i].g = 40.0f;
                LVerts[i].b = 80.0f + 20.0f * (geFloat)i;
                LVerts[i].a = 128.0f;
                LVerts[i].X = Verts[i]->X;
                LVerts[i].Y = Verts[i]->Y;
                LVerts[i].Z = Verts[i]->Z;
        }

        geWorld_AddPolyOnce(World, &LVerts[0], 4, NULL, GE_GOURAUD_POLY, GE_FX_TRANSPARENT, 1.0f);
}

void    DrawBoundBox(geWorld *World, const geVec3d *Pos, const geVec3d *Min, const geVec3d *Max)
{
        geFloat dx;
        geFloat dy;
        geFloat dz;
static  geVec3d         Verts[8];
static  geVec3d *       Faces[6][4] =
{
        { &Verts[0], &Verts[1], &Verts[2], &Verts[3] }, //Top
        { &Verts[4], &Verts[5], &Verts[6], &Verts[7] }, //Bottom
        { &Verts[3], &Verts[2], &Verts[6], &Verts[7] }, //Side
        { &Verts[1], &Verts[0], &Verts[4], &Verts[5] }, //Side
        { &Verts[0], &Verts[3], &Verts[7], &Verts[4] }, //Front
        { &Verts[2], &Verts[1], &Verts[5], &Verts[6] }, //Back
};
        int                     i;

        for     (i = 0; i < 8; i++)
                geVec3d_Add(Pos, Min, &Verts[i]);

        dx = Max->X - Min->X;
        dy = Max->Y - Min->Y;
        dz = Max->Z - Min->Z;

        Verts[0].Y += dy;
        Verts[3].Y += dy;
        Verts[3].X += dx;
        Verts[7].X += dx;

        Verts[1].Y += dy;
        Verts[1].Z += dz;
        Verts[5].Z += dz;
        Verts[6].Z += dz;
        Verts[6].X += dx;

        Verts[2].X += dx;
        Verts[2].Y += dy;
        Verts[2].Z += dz;

        for     (i = 0; i < 6; i++)
                DrawFace(World, &Faces[i][0]);
}

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