public RectangleF Selection(ICanvas canvas)
{
Rectangle screenRect = ScreenRect();
if (screenRect.IsEmpty)
{
return(RectangleF.Empty);
}
return(ScreenUtils.ToUnitNormalized(canvas, screenRect));
}
/// <summary>
/// 响应消息
/// </summary>
/// <param name="e"></param>
protected override void OnPaint(PaintEventArgs e)
{
CommonTools.Tracing.StartTrack(Program.TracePaint); //TracePaint=1
ClearPens(); //清空画笔
e.Graphics.SmoothingMode = m_smoothingMode;
CanvasWrapper dc = new CanvasWrapper(this, e.Graphics, ClientRectangle);
Rectangle cliprectangle = e.ClipRectangle;
if (m_staticImage == null)
{
cliprectangle = ClientRectangle;
m_staticImage = new Bitmap(ClientRectangle.Width, ClientRectangle.Height);
m_staticDirty = true;
}
RectangleF r = ScreenUtils.ToUnitNormalized(dc, cliprectangle);
if (float.IsNaN(r.Width) || float.IsInfinity(r.Width))
{
r = ScreenUtils.ToUnitNormalized(dc, cliprectangle);
}
if (m_staticDirty)
{
m_staticDirty = false;
CanvasWrapper dcStatic = new CanvasWrapper(this, Graphics.FromImage(m_staticImage), ClientRectangle);
dcStatic.Graphics.SmoothingMode = m_smoothingMode;
m_model.BackgroundLayer.Draw(dcStatic, r);
if (m_model.GridLayer.Enabled)
{
m_model.GridLayer.Draw(dcStatic, r);
}
PointF nullPoint = ToScreen(new UnitPoint(0, 0));
dcStatic.Graphics.DrawLine(Pens.Blue, nullPoint.X - 10, nullPoint.Y, nullPoint.X + 10, nullPoint.Y);
dcStatic.Graphics.DrawLine(Pens.Blue, nullPoint.X, nullPoint.Y - 10, nullPoint.X, nullPoint.Y + 10);
ICanvasLayer[] layers = m_model.Layers; //线条粗细颜色
for (int layerindex = layers.Length - 1; layerindex >= 0; layerindex--)
{
if (layers[layerindex] != m_model.ActiveLayer && layers[layerindex].Visible)
{
layers[layerindex].Draw(dcStatic, r);
}
}
if (m_model.ActiveLayer != null)
{
m_model.ActiveLayer.Draw(dcStatic, r);
}
dcStatic.Dispose();
}
e.Graphics.DrawImage(m_staticImage, cliprectangle, cliprectangle, GraphicsUnit.Pixel);
foreach (IDrawObject drawobject in m_model.SelectedObjects)
{
drawobject.Draw(dc, r);
}
if (m_newObject != null)
{
m_newObject.Draw(dc, r);
}
if (m_snappoint != null)
{
m_snappoint.Draw(dc);
}
if (m_selection != null)
{
m_selection.Reset();
m_selection.SetMousePoint(e.Graphics, this.PointToClient(Control.MousePosition));
}
if (m_moveHelper.IsEmpty == false)
{
m_moveHelper.DrawObjects(dc, r);
}
if (m_nodeMoveHelper.IsEmpty == false)
{
m_nodeMoveHelper.DrawObjects(dc, r);
}
dc.Dispose();
ClearPens();
CommonTools.Tracing.EndTrack(Program.TracePaint, "OnPaint complete");
}
