protected override void OnPaint(PaintEventArgs pe)
{
EnsureRender();
var g = pe.Graphics;
g.Clear(Color.Gray);
// draw the board in the center
var renderPos = this.RenderPos;
g.DrawImage(_render, renderPos.X, renderPos.Y);
// draw carry stack
if (_carryPos.HasValue && _carryVisible && _carryStack.Count > 0)
{
var stackBottom = new PointF(_carryPos.Value.X, _carryPos.Value.Y);
foreach (var pieceID in _carryStack)
{
var sprite = IsoImages.GetPieceImage(pieceID);
var rect = GetBottomedRect(stackBottom, sprite.Size);
g.DrawImage(sprite, rect.Left, rect.Top);
stackBottom.Y -= IsoGeometry.FlatStone.Height;
}
}
base.OnPaint(pe);
}
void InitButtonImages()
{
foreach (var tool in _tools)
{
tool.Btn.Image = IsoImages.GetPieceImage(tool.PieceID);
}
}
/// <summary>
/// Redraws the off-screen board render as needed
/// </summary>
void EnsureRender()
{
if (!_renderValid)
{
// Clear layout information every time we redraw
_layoutItems.Clear();
int gameSize = _game != null ? _game.Size : 5;
// Prepare to draw game board
var board = IsoImages.GetBoardImage(gameSize);
if (_render != null && _render.Width != board.Width)
{
_render.Dispose();
_render = null;
}
if (_render == null)
{
// allocate enough extra vertical space to hold some tall stacks of stones
_render = new Bitmap(board.Width, board.Height + 120, System.Drawing.Imaging.PixelFormat.Format32bppPArgb);
}
using (var g = Graphics.FromImage(_render))
{
// Draw the game board on a transparent background
g.Clear(Color.Transparent);
g.DrawImage(board, 0, _render.Height - board.Height);
// Draw game pieces
if (_game != null)
{
var boardul = new PointF(0, _render.Height - board.Height);
var mask = IsoImages.GetSquareMaskImage();
BoardPosition viewPos;
// Draw board pieces from back to front, bottom to top
var blSquareCenter = IsoGeometry.Board.BottomLeftSquare(gameSize);
for (viewPos.Y = gameSize - 1; viewPos.Y >= 0; viewPos.Y--)
{
for (viewPos.X = 0; viewPos.X < gameSize; viewPos.X++)
{
// Calculate center position for this square
var squareCenter = new PointF(
boardul.X + blSquareCenter.X + IsoGeometry.Board.Square.XDelta.X * viewPos.X + IsoGeometry.Board.Square.YDelta.X * viewPos.Y,
boardul.Y + blSquareCenter.Y + IsoGeometry.Board.Square.XDelta.Y * viewPos.X + IsoGeometry.Board.Square.YDelta.Y * viewPos.Y);
var pos = GetRotated(gameSize, viewPos, _rot);
// square mask goes at the bottom of the stack
var rect = GetCenteredRect(squareCenter, mask.Size);
_layoutItems.Add(new RenderLayoutItem(pos, null, rect, mask));
bool highlighting = false;
int? height = null;
if (_highlights.TryGetValue(pos, out height))
{
highlighting = true;
}
if (highlighting && !height.HasValue)
{
// highlight square
g.DrawImage(mask, rect.Left, rect.Top);
}
// draw pieces from bottom to top
var stack = _game.Board[pos.X, pos.Y];
for (int i = 0; i < stack.Count; i++)
{
var piece = stack[i];
var sprite = IsoImages.GetPieceImage(piece, highlighted: highlighting && height.HasValue && i >= height.Value);
rect = GetBottomedRect(squareCenter, sprite.Size);
g.DrawImage(sprite, rect.Left, rect.Top);
_layoutItems.Add(new RenderLayoutItem(pos, i, rect, sprite)); // remember layout information for mouse hit test
squareCenter.Y -= IsoGeometry.FlatStone.Height;
}
}
}
}
}
// Reverse the order of sprites because the last ones drawn are actually in front, and should be tested first
// when trying to determine which piece the user has clicked on
_layoutItems.Reverse();
_renderValid = true;
}
}