/// <summary>
/// Scene redrawing
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void screen_Paint(object sender, PaintEventArgs e)
{
// Buffer creation, initialization
Ruler sizes = new Ruler(screen);
Rectangle board_coordinates = sizes.GetBoardCoordinates();
Image gfx = new Bitmap(board_coordinates.Width, board_coordinates.Height);
Graphics g = Graphics.FromImage(gfx);
// Draw all the checkers
for (int i = 0; i < 8; i++)
{
for (int j = 0; j < 8; j++)
{
if (_state.checkers[j, i] != null)
{
// Drawing static checkers
if (_state.checkers[j, i] != _mouseHandler._drag)
{
g.DrawImage(_state.checkers[j, i].img, _state.checkers[j, i].rect);
}
}
}
}
// Drawing moving checker
if (_mouseHandler._drag != null)
{
g.DrawImage(_mouseHandler._drag.img, _mouseHandler._drag.rect);
}
// Quickly draw a scene
g.Flush(System.Drawing.Drawing2D.FlushIntention.Sync);
e.Graphics.DrawImage(gfx, board_coordinates);
e.Graphics.Flush(System.Drawing.Drawing2D.FlushIntention.Sync);
}
/// <summary>
/// Handler event for moving the mouse
/// </summary>
/// <param name="e">Mouse options</param>
public void MouseMove(MouseEventArgs e)
{
// Checker is not selected
if (_drag == null)
{
return;
}
// Determining the visual characteristics of a dragging checker
Ruler ruler = new Ruler(_screen);
Rectangle board_coord = ruler.GetBoardCoordinates();
Point click_coord = new Point(e.X - board_coord.X, e.Y - board_coord.Y);
_drag.rect.X = click_coord.X - _drag.rect.Width / 2;
_drag.rect.Y = click_coord.Y - _drag.rect.Height / 2;
return;
}
/// <summary>
/// User-click event handler
/// </summary>
/// <param name="e">Mouse options</param>
public void MouseDown(MouseEventArgs e)
{
// Definition of checkers under the cursor at the moment of pressing
Ruler ruler = new Ruler(_screen);
Rectangle board_coord = ruler.GetBoardCoordinates();
Point click_coord = new Point(e.X - board_coord.X, e.Y - board_coord.Y);
Point? checker_intersection = ruler.GetCellIntersection(e.Location);
// Determining the selected checker and its visual characteristics
if (!checker_intersection.HasValue)
{
return;
}
_clicked = checker_intersection;
Rectangle checker_rect = ruler.GetCellCoordinates(checker_intersection.Value);
// There are no checkers under the cursor
if (_clicked == null)
{
return;
}
// Enemy checker is selected - the move is impossible
if (_state.checkers[_clicked.Value.X, _clicked.Value.Y] != null && _state.checkers[_clicked.Value.X, _clicked.Value.Y].belong_to != _state.turn)
{
ShowIncorrectTurnMessage(Reason.EnemyChecker);
return;
}
// Expected move continuation, another checker move is impossible.
if (_continious != null && _clicked != _continious)
{
ShowIncorrectTurnMessage(Reason.TurnContinuationExpected);
return;
}
// Checker selection
_drag = _state.checkers[_clicked.Value.X, _clicked.Value.Y];
}