public virtual void Begin (DrawBatch drawBatch)
{
drawBatch.Begin(DrawSortMode.Deferred, null, null, null, GetCommonRasterizerState(), null, Matrix.Identity);
}
private Vector2 BeginDrawInner(DrawBatch drawBatch, SamplerState samplerState)
{
SetupRasterizerState(drawBatch.GraphicsDevice);
Vector2 offset = GetOffset();
Matrix transform = Matrix.CreateTranslation(offset.X, offset.Y, 0);
drawBatch.Begin(DrawSortMode.Deferred, BlendState.NonPremultiplied, samplerState, null, _rasterState, null, transform);
return offset;
}
private void DrawObjectAction(DrawBatch drawBatch)
{
if (_sourceImage == null)
return;
drawBatch.GraphicsDevice.ScissorRectangle = Xna.Rectangle.Empty;
if (_objectBrush == null)
_objectBrush = new TextureBrush(_sourceImage.CreateTexture(_drawControl.GraphicsDevice)) { OwnsTexture = true };
if (_maskPen == null)
_maskPen = new Pen(new CheckerBrush(_drawControl.GraphicsDevice, Xna.Color.Black, Xna.Color.White, 4, .75f), true);
int originX = (_drawControl.Width - _sourceImage.Width) / 2;
int originY = (_drawControl.Height - _sourceImage.Height) / 2;
_objectBrush.Transform = Xna.Matrix.CreateTranslation(-(float)originX / _sourceImage.Width, -(float)originY / _sourceImage.Height, 0);
drawBatch.Begin();
drawBatch.FillRectangle(_objectBrush, new Xna.Rectangle(originX, originY, _sourceImage.Width, _sourceImage.Height));
drawBatch.DrawRectangle(_maskPen, new Microsoft.Xna.Framework.Rectangle(
originX - 1 + (_maskLeft ?? 0) + (_originX ?? 0),
originY - 1 + (_maskTop ?? 0) + (_originY ?? 0),
1 + (_maskRight - _maskLeft) ?? 0,
1 + (_maskBottom - _maskTop) ?? 0));
drawBatch.FillCircle(Brush.White, new Xna.Vector2(originX + _originX ?? 0, originY + _originY ?? 0), 4, 12);
drawBatch.FillCircle(Brush.Black, new Xna.Vector2(originX + _originX ?? 0, originY + _originY ?? 0), 3, 12);
drawBatch.End();
}