private void DrawWalls(PolarGrid polarGrid)
{
Vector2Int center = Center;
for (int i = 1; i < polarGrid.RowCount; ++i)
{
int rowLength = polarGrid.RowLength(i);
float theta = Mathf.PI * 2.0f / (float)rowLength;
float inRadius = cellHeight * (float)i;
float outRadius = inRadius + cellHeight;
Vector2 cwDir = Vector2.right;
Vector2 ccwDir = Vector2.right;
float accumAngle = 0.0f;
for (int j = 0; j != rowLength; ++j)
{
cwDir = ccwDir;
accumAngle += theta;
ccwDir = new Vector2(Mathf.Cos(accumAngle), Mathf.Sin(accumAngle));
// ccw
Vector2 ccwInRadius = ccwDir * inRadius;
Vector2Int a = center + new Vector2Int((int)ccwInRadius.x, (int)ccwInRadius.y);
Vector2 ccwOutRadius = ccwDir * outRadius;
Vector2Int b = center + new Vector2Int((int)ccwOutRadius.x, (int)ccwOutRadius.y);
Vector2 cwInRadius = cwDir * inRadius;
Vector2Int c = center + new Vector2Int((int)cwInRadius.x, (int)cwInRadius.y);
// Vector2 cwOutRadius = cwDir * outRadius;
// Vector2Int d = center + new Vector2Int((int)cwOutRadius.x, (int)cwOutRadius.y);
int vertex = polarGrid.RowColIndex(i, j);
int inward = polarGrid.Inward(new Position(i, j));
int ccwVertex = polarGrid.CCW(new Position(i, j));
if (!polarGrid.Graph.AreLinked(vertex, inward))
{
tex.Line(a, c, wallColor);
}
if (!polarGrid.Graph.AreLinked(vertex, ccwVertex))
{
tex.Line(a, b, wallColor);
}
}
}
}
private void PaintDistances(PolarGrid polarGrid, Color[] vertexDistanceColors)
{
Vector2 center = Center;
int maxRadius = cellHeight * polarGrid.RowCount;
float TwoPi = Mathf.PI * 2.0f;
for (int y = 0; y != tex.height; ++y)
{
for (int x = 0; x != tex.width; ++x)
{
Color color;
// inside circle?
Vector2 fromCenter = new Vector2(x, y) - center;
float magnitude = fromCenter.magnitude;
if (magnitude < maxRadius)
{
int row = (int)(magnitude / (float)cellHeight);
float theta = TwoPi / polarGrid.RowLength(row);
float angle = Vector2.SignedAngle(Vector2.right, fromCenter.normalized) * Mathf.Deg2Rad;
if (angle < 0.0f)
{
angle += TwoPi;
}
int col = (int)(angle / theta);
int vertex = polarGrid.RowColIndex(row, col);
color = vertexDistanceColors[vertex];
}
else
{
color = backgroundColor;
}
tex.SetPixel(x, y, color);
}
}
}