SCR_Shape.c

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class SCR_Shape
{
    static void GetBoundsPoints(vector min, vector max, out vector points[19])
    {       
        //--- Front
        points[0] = min;
        points[1] = Vector(max[0], min[1], min[2]);
        points[2] = Vector(max[0], max[1], min[2]);
        points[3] = Vector(min[0], max[1], min[2]);
        
        //--- Left
        points[4] = min;
        points[5] = Vector(min[0], min[1], max[2]);
        points[6] = Vector(min[0], max[1], max[2]);
        
        //--- Top
        points[7] = Vector(min[0], max[1], min[2]);
        points[8] = Vector(max[0], max[1], min[2]);
        points[9] = max;
        
        //--- Back
        points[10] = Vector(min[0], max[1], max[2]);
        points[11] = Vector(min[0], min[1], max[2]);
        points[12] = Vector(max[0], min[1], max[2]);
        
        //--- Right
        points[13] = max;
        points[14] = Vector(max[0], max[1], min[2]);
        points[15] = Vector(max[0], min[1], min[2]);
        
        //--- Bottom
        points[16] = Vector(max[0], min[1], max[2]);
        points[17] = Vector(min[0], min[1], max[2]);
        points[18] = min;
    }
    static Shape CreateBounds(vector min, vector max, int color, ShapeFlags flags)
    {
        vector points[19];
        GetBoundsPoints(min, max, points);
        
        return Shape.CreateLines(Color.RED, ShapeFlags.NOZBUFFER, points, 19);
    }
    
    static Resource CreateAreaMesh(array<vector> positions, float height, string material, bool strechMaterial)
    {
        if (!material)
            return null;
        
        int resolution = positions.Count();
        if (resolution == 0) return null;
        
        if (resolution * 12 > 720)
        {
            Print(string.Format("Cannot generate shape, resolution %1 is above maximum value %2!", resolution, 720 / 12), LogLevel.ERROR);
            return null;
        }
        
        vector verts[244];
        int indices[732];
        float uvs[1464];
        
        float dirStep = Math.PI2 / resolution;
        float uvsTemplate[] = {0,0, 0,1, 1,0, 1,1};
        int vertsTemplate[] = {0,2,1, 1,2,3, 3,2,1, 1,2,0};
        int indicesMod = 4 * resolution;
        int vI, iI, uI;
        vector vectorUp = vector.Up * height;
        vector pos0, pos1, pos2, pos3;
        vector matrix[4];
        
        for (int v = -1; v < resolution; v++)
        {
            /*
                1 - 3 - 5...
                | \ | \ |
                0 - 2 - 4...
            
                Vertex 1: 0-2-1
                Vertex 2: 1-2-3
                Vertex 3: 2-4-3
                Vertex 4: 3-4-5
                ...
            */
            int id = v;
            if (id < 0) id += resolution;
            pos2 = positions[id];
            pos3 = pos2 + vectorUp;
            
            if (v != -1)
            {
                verts[vI] = pos3; vI++;
                verts[vI] = pos2; vI++;
                verts[vI] = pos1; vI++; 
                verts[vI] = pos0; vI++;
                
                int iIS = iI;
                for (int i = 0; i < 12; i++)
                {
                    indices[iI] = (vI + vertsTemplate[iI - iIS]) % indicesMod; iI++;
                }
                int uIS = uI;
                for (int i = 0; i < 4; i++)
                {
                    if (strechMaterial)
                    {
                        uvs[uI] = (resolution - v + uvsTemplate[uI - uIS]) / resolution;
                        if (v == 0) uvs[uI] = uvs[uI] - 1;
                    }
                    else
                    {
                        uvs[uI] = uvsTemplate[uI - uIS]; 
                    }
                    uI++;
                    uvs[uI] = uvsTemplate[uI - uIS]; uI++;
                }
            }
            
            pos0 = pos2;
            pos1 = pos3;
        }
 
        int numVertices[] = {vI};
        int numIndices[] = {iI};
        string materials[1] = {material};
        
        Resource res = MeshObject.Create(1, numVertices, numIndices, materials, 0);
        MeshObject meshObject = res.GetResource().ToMeshObject();
        meshObject.UpdateVerts(0, verts, uvs);
        meshObject.UpdateIndices(0, indices);
        
        return res;
    }
 
    //------------------------------------------------------------------------------------------------
    static void DrawCircle(vector transform[4], float radius, int colorOutline, int colorPlane, ShapeFlags shapeFlags)
    {
 
        const int sectionCount = 36;
        const int linesCount = sectionCount + 1; // one extra line is needed to complete outline
        const int trisCount = sectionCount * 3;
        vector lines[linesCount];
        vector tris[trisCount];
 
        // If angle and section count become parametrized, this could become DrawArc
        float sectionStep = -360 / sectionCount;
 
        vector pivot = transform[3];
        vector point = (vector.Forward * radius).Multiply4(transform);
 
        for (int i; i < sectionCount; i++)
        {
            lines[i] = point;
            tris[i*3] = pivot;
            tris[i*3 + 1] = point;
            point = (Vector(sectionStep * (i + 1), 0, 0).AnglesToVector() * radius);
            point = point.Multiply4(transform);
            tris[i*3 + 2] = point;
        }
 
        // one extra line is needed to complete outline
        lines[sectionCount] = point;
 
        Shape.CreateLines(colorOutline, shapeFlags, lines, linesCount);
        Shape.CreateTris(colorPlane, shapeFlags, tris, sectionCount);
    }
}