public override void Update(GameTime gameTime)
{
base.Update(gameTime);
if (DestinationRect.Contains(Input.X, Input.Y) && Texture != null)
{
int texWidth = SourceRect == null ? Texture.Width : SourceRect.Value.Width;
int texHeight = SourceRect == null ? Texture.Height : SourceRect.Value.Height;
if (Input.WheelDelta != 0)
{
Zoom += 10 * Zoom / Input.WheelDelta;
}
Zoom = MathUtil.Clamp(Zoom, 0.05f, 1f);
if (Input.MiddleButton.Down)
{
Position -= new Vector2(Input.XDelta, Input.YDelta) * Zoom;
}
Vector2 max = new Vector2((float)(texWidth - DestinationRect.Width * ratioWPixelScreenPicture),
(float)(texHeight - DestinationRect.Height * ratioHPixelScreenPicture));
max.X = max.X < 0 ? 0 : max.X;
max.Y = max.Y < 0 ? 0 : max.Y;
Position = DrawHelper.ClampVector(Position, Vector2.Zero, max);
if (Input.LeftButton.Pressed)
{
if (SelectionMode)
{
isSelecting = true;
SelectedRectangle = null;
selectionStartPoint = ConvertScreenToPicture(new Vector2(Input.X, Input.Y));
}
}
if (Input.RightButton.Pressed)
{
if (SelectPointMode)
{
SelectedPoint = ConvertScreenToPicture(new Vector2(Input.X, Input.Y));
}
}
}
if (Input.LeftButton.Released && isSelecting == true)
{
isSelecting = false;
Vector2 selectionEndPoint = ConvertScreenToPicture(new Vector2(Input.X, Input.Y));
Rectangle selectionRect = new Rectangle();
selectionRect.Left = Math.Min((int)selectionStartPoint.X, (int)selectionEndPoint.X);
selectionRect.Right = Math.Max((int)selectionStartPoint.X, (int)selectionEndPoint.X) + 1;
selectionRect.Top = Math.Min((int)selectionStartPoint.Y, (int)selectionEndPoint.Y);
selectionRect.Bottom = Math.Max((int)selectionStartPoint.Y, (int)selectionEndPoint.Y) + 1;
SelectedRectangle = selectionRect;
}
}