private void OnMouseLeftButtonDown(object sender, System.Windows.Input.MouseButtonEventArgs e)
{
if (!EditEnabled)
{
return;
}
var point = e.GetPosition(this);
if (MaxChildren > 0 && History.Count >= MaxChildren)
{
// 不在框内按下鼠标，不处理拖动
if (!current.ElementRect.Contains(point))
{
return;
}
MouseDownPoint = point;
MoveMode = true;
IsMouseDown = true;
EmitDrawEvent(DrawState.Start);
return;
}
current = new DrawRecord
{
Shape = DefaultDrawType,
Color = Colors.Blue
};
current.Start = point;
IsMouseDown = true;
EmitDrawEvent(DrawState.Start);
}
public static void Draw(this Canvas canvas, DrawRecord record)
{
if (History == null)
{
History = new Dictionary <Canvas, Stack <int> >();
}
Stack <int> history = null;
if (History.ContainsKey(canvas))
{
history = History[canvas];
}
else
{
history = new Stack <int>();
History.Add(canvas, history);
}
var element = record.GetElement();
if (element == null)
{
return;
}
history.Push(canvas.Children.Add(element));
GC.Collect();
}
public static void Draw(this Graphics graphics, DrawRecord record)
{
var width = record.Width;
using (var pen = new Pen(record.Color.ToDrawingColor(), width))
{
pen.StartCap = LineCap.Round;
pen.MiterLimit = 0.1f;
if (record.LineStyle == LineStyles.Dashed)
{
pen.DashStyle = DashStyle.Dash;
}
else if (record.LineStyle == LineStyles.Dotted)
{
pen.DashStyle = DashStyle.Dot;
}
switch (record.Shape)
{
case DrawShapes.Curve:
pen.EndCap = LineCap.Round;
graphics.DrawCurve(pen, record.Points.Select(p => new Point((int)p.X, (int)p.Y)).ToArray());
break;
case DrawShapes.Ellipse:
graphics.DrawEllipse(pen, record.Rect.ToDrawingRectangle());
break;
case DrawShapes.Line:
pen.EndCap = LineCap.Round;
graphics.DrawLine(pen, record.Start.ToDrawingPoint(), record.End.ToDrawingPoint());
break;
case DrawShapes.Rectangle:
graphics.DrawRectangle(pen, record.Rect.ToDrawingRectangle());
break;
case DrawShapes.Text:
if (string.IsNullOrWhiteSpace(record.Text))
{
return;
}
graphics.DrawString(record.Text, record.TextFont,
new SolidBrush(record.Color.ToDrawingColor()), record.Start.ToDrawingPoint());
break;
case DrawShapes.Arrow:
var cap = new AdjustableArrowCap(5, 5, false);
pen.CustomEndCap = cap;
graphics.DrawLine(pen, record.Start.ToDrawingPoint(), record.End.ToDrawingPoint());
break;
}
}
graphics.Flush();
GC.Collect();
}
/// <summary>
/// 绘制图形
/// </summary>
/// <param name="record"></param>
public void Draw(DrawRecord record)
{
var element = record.GetElement();
if (element == null)
{
return;
}
if (History.Any(item => item.Equals(element)))
{
return;
}
Children.Add(element);
History.Push(element);
GC.Collect();
}
public static void Draw(this Graphics graphics, DrawRecord record)
{
var width = record.Width;
var brush = new SolidBrush(record.Color.ToDrawingColor());
var pen = new Pen(brush, width);
//pen.StartCap = LineCap.Square;
//pen.MiterLimit = 0.1f;
if (record.LineStyle == LineStyles.Dashed)
{
pen.DashStyle = DashStyle.Dash;
}
else if (record.LineStyle == LineStyles.Dotted)
{
pen.DashStyle = DashStyle.Dot;
}
switch (record.Shape)
{
case DrawShapes.Curve:
//pen.EndCap = LineCap.Square;
graphics.DrawCurve(pen, record.Points.Select(p => new Point((int)p.X, (int)p.Y)).ToArray());
break;
case DrawShapes.Ellipse:
if (record.Mode == DrawModes.Stroke)
{
graphics.DrawEllipse(pen, record.Rect.ToDrawingRectangle());
}
else if (record.Mode == DrawModes.Fill)
{
graphics.FillEllipse(brush, record.Rect.ToDrawingRectangle());
}
break;
case DrawShapes.Line:
//pen.EndCap = LineCap.Square;
graphics.DrawLine(pen, record.Start.ToDrawingPoint(), record.End.ToDrawingPoint());
break;
case DrawShapes.Rectangle:
if (record.Mode == DrawModes.Stroke)
{
graphics.DrawRectangle(pen, record.Rect.ToDrawingRectangle());
}
else if (record.Mode == DrawModes.Fill)
{
graphics.FillRectangle(brush, record.Rect.ToDrawingRectangle());
}
break;
case DrawShapes.Polygon:
if (record.Mode == DrawModes.Stroke)
{
graphics.DrawPolygon(pen, record.Points.Take(record.Points.Count - 1).Select(p => p.ToDrawingPoint()).ToArray());
}
else if (record.Mode == DrawModes.Fill)
{
graphics.FillPolygon(brush, record.Points.Take(record.Points.Count - 1).Select(p => p.ToDrawingPoint()).ToArray());
}
break;
case DrawShapes.Text:
if (string.IsNullOrWhiteSpace(record.Text))
{
return;
}
graphics.DrawString(record.Text, record.TextFont,
new SolidBrush(record.Color.ToDrawingColor()), record.Start.ToDrawingPoint());
break;
case DrawShapes.Arrow:
int arrowSize;
switch (record.Distance)
{
case 5:
case 4:
arrowSize = 2;
break;
case 3:
case 2:
case 1:
arrowSize = 1;
break;
default:
arrowSize = 5;
break;
}
var cap = new AdjustableArrowCap(arrowSize, arrowSize, false);
pen.CustomEndCap = cap;
graphics.DrawLine(pen, record.Start.ToDrawingPoint(), record.End.ToDrawingPoint());
break;
}
pen.Dispose();
brush.Dispose();
graphics.Flush();
GC.Collect();
}
