private void DrawWalls(TriGrid grid)
{
float halfSideSize = sideSize / 2;
int halfSideSizeInt = (int)halfSideSize;
float height = TriangleHeight;
float halfHeight = height / 2.0f;
for (int i = 0; i < grid.height; ++i)
{
int centerY = tex.height - ((int)(halfHeight + i * height));
int north = (int)(centerY + halfHeight);
int south = north - (int)height;
// upright
for (int j = (i % 2); j < grid.width; j += 2)
{
int centerX = halfSideSizeInt + j * halfSideSizeInt;
int west = Mathf.Max(0, centerX - halfSideSizeInt);
int east = centerX + halfSideSizeInt;
int currentVertex = grid.PositionToVertex(i, j);
if (!grid.Graph.AreLinked(currentVertex, grid.EastOf(currentVertex)))
{
tex.Line(new Vector2Int(east, south), new Vector2Int(centerX, north), wallColor);
}
if (!grid.Graph.AreLinked(currentVertex, grid.SouthOf(currentVertex)))
{
tex.HorizontalLine(west, east, south, wallColor);
}
}
// !upright
for (int j = ((i + 1) % 2); j < grid.width; j += 2)
{
int centerX = (int)(halfSideSize + j * halfSideSize);
int west = centerX - halfSideSizeInt;
int east = centerX + halfSideSizeInt;
int currentVertex = grid.PositionToVertex(i, j);
if (!grid.Graph.AreLinked(currentVertex, grid.EastOf(currentVertex)))
{
tex.Line(new Vector2Int(east, north), new Vector2Int(centerX, south), wallColor);
}
if (!grid.Graph.AreLinked(currentVertex, grid.NorthOf(currentVertex)))
{
tex.HorizontalLine(west, east, north, wallColor);
}
}
}
}
private void PaintDistances(TriGrid triGrid, Color[] vertexDistanceColors)
{
float halfSideSize = sideSize / 2;
int halfSideSizeInt = (int)halfSideSize;
float height = TriangleHeight;
float halfHeight = height / 2.0f;
Vector2 texPoint = new Vector2();
for (int y = 0; y != tex.height; ++y)
{
int row = (int)(((float)(tex.height - y)) / height); // y texture to grid row
texPoint.y = y + 0.5f;
int centerY = tex.height - ((int)(halfHeight + row * height));
float north = centerY + halfHeight + 0.5f;
float south = north - height - 0.5f;
for (int x = 0; x != tex.width; ++x)
{
Color color = backgroundColor;
texPoint.x = x + 0.5f;
int halfSizeCount = (int)(x / halfSideSize);
int fromCol = Mathf.Max(0, halfSizeCount - 1);
int maxCol = Mathf.Min(halfSizeCount + 2, triGrid.width);
for (int col = fromCol; col != maxCol; ++col)
{
int vertex = triGrid.PositionToVertex(row, col);
int centerX = halfSideSizeInt + col * halfSideSizeInt;
int west = Mathf.Max(0, centerX - halfSideSizeInt);
int east = centerX + halfSideSizeInt;
Vector2 a = new Vector2();
Vector2 b = new Vector2();
Vector2 c = new Vector2();
if (triGrid.IsUpright(vertex))
{
a.Set(centerX + 0.5f, north);
b.Set(east + 0.5f, south);
c.Set(west + 0.5f, south);
}
else
{
a.Set(centerX + 0.5f, south);
b.Set(west + 0.5f, north);
c.Set(east + 0.5f, north);
}
if (PointTest2D.IsInsideTri(texPoint, a, b, c))
{
color = vertexDistanceColors[vertex];
break;
}
}
tex.SetPixel(x, y, color);
}
}
}