/// <summary>
/// Draws the hex grid on the given graphics.
/// </summary>
/// <param name="gr">The graphics to draw on</param>
/// <param name="pen">The pen to draw the lines of the grid</param>
/// <param name="xOffset">The offset to the right from the top left corner</param>
/// <param name="yOffset">The offset to the bottom from the top left corner</param>
public void DrawHexGrid(Graphics gr, Pen pen, float xOffset = 0, float yOffset = 0)
{
// Allow easier access to the points for drawing
PointF[] points;
RegularHexagon hex;
// Create our arguments outside of the loop to avoid extra garbage collection
SingleHexagonDrawEventArgs singleArgs = new SingleHexagonDrawEventArgs();
singleArgs.gr = gr;
singleArgs.pen = pen;
singleArgs.grid = this;
HexagonGridDrawEventArgs gridArgs = new HexagonGridDrawEventArgs();
gridArgs.gr = gr;
gridArgs.pen = pen;
gridArgs.grid = this;
// Setup for drawing
ResizeGrid();
OnBeforeGridDraw(gridArgs);
// Draw
for (int row = 0; row < rows; row++)
{
for (int col = 0; col < columns; col++)
{
// Calculate and draw the hexagon
hex = HexToPoints(row, col, xOffset, yOffset);
_hexagons[row, col] = hex;
points = hex.vertices;
gr.DrawPolygon(pen, points);
// Update our event args
singleArgs.hex = hex;
singleArgs.row = row;
singleArgs.column = col;
// Run our hex events
OnSingleHexDraw(singleArgs);
}
}
// Run our grid draw events
OnHexagonGridDraw(gridArgs);
}
/// <summary>
/// Runs the events for BeforeGridDraw, protecting against null values.
/// </summary>
/// <param name="e">The arguments to be passed on</param>
protected virtual void OnBeforeGridDraw(HexagonGridDrawEventArgs e)
{
BeforeGridDraw?.Invoke(this, e);
}