C# ArcEngine二次开发之动态图层
2024-10-19 02:23:44
ArcEngine搭载C#进行GIS的二次开发，关于目标显示的问题，由于考虑到设置定时器刷新目标位置和方向，因此在显示图层上采用的是动态图层DynamicLayer，主要用到的dll文件是ESRI.ArcGIS.ADF.BaseClasses，通过继承BaseDynamicLayer设计一个自己的动态图层基类，这样在加载其他图层时可以很方便的调用。先上基类的代码
using ESRI.ArcGIS.ADF.BaseClasses;
using ESRI.ArcGIS.Display;
using ESRI.ArcGIS.Geometry;
using System;
using System.Windows.Forms; namespace GIS
{
public abstract class myDynamicLayer : BaseDynamicLayer
{
protected IDynamicGlyph DynamicGlyph; private readonly Timer timer = new Timer();
private bool isUpdate; public IColor TransparenyColor { get; set; } public int Level { get; set; } public double Scale
{
get { return MapElement.GetScale(Level); }
} public IPoint MouseMvePoint { get; set; } public string LayerName
{
get { return m_sName; }
set { m_sName = value; }
} public int TimerInterval
{
get { return timer.Interval; }
set
{
timer.Enabled = false;
timer.Interval = value;
timer.Enabled = true;
}
} public void BeginUpdate()
{
isUpdate = true;
} public void EndUpdate()
{
isUpdate = false;
} protected FisDynamicLayer()
{
Level = ;
timer.Interval = ;
timer.Tick += timer_Tick;
timer.Enabled = true;
TransparenyColor = MapElement.SetColor(, , , );
} public override void DrawDynamicLayer(esriDynamicDrawPhase DynamicDrawPhase, IDisplay Display, IDynamicDisplay DynamicDisplay)
{
if (!m_bIsImmediateDirty) return; if (DynamicDrawPhase != esriDynamicDrawPhase.esriDDPImmediate)
{
return;
} if (!m_bValid || !m_visible)
{
return;
} if (isUpdate)
{
return;
} IDynamicSymbolProperties2 DynamicSymbolProps = DynamicDisplay as IDynamicSymbolProperties2;
IDynamicGlyphFactory2 DynamicGlyphFactory2 = DynamicDisplay.DynamicGlyphFactory as IDynamicGlyphFactory2; if (DynamicSymbolProps == null || DynamicGlyphFactory2 == null)
{
return;
} DrawDynamicLayerEx(DynamicDisplay, DynamicGlyphFactory2, DynamicSymbolProps); m_bIsImmediateDirty = false;
}
private void timer_Tick(object sender, EventArgs e)
{
if (!m_bIsImmediateDirty)
m_bIsImmediateDirty = true;
}
}
}
此外需要在动态图层基类中创建一个abstract方法以方便继承时写入不同图层的需要
public abstract void DrawDynamicLayerEx(IDynamicDisplay DynamicDisplay, IDynamicGlyphFactory2 DynamicGlyphFactory2, IDynamicSymbolProperties2 DynamicSymbolProps);
这样你就有了一个可以继承的动态图层基类了，生成新图层时重写上面的抽象方法即可，例如：
public override void DrawDynamicLayerEx(IDynamicDisplay DynamicDisplay, IDynamicGlyphFactory2 DynamicGlyphFactory2, IDynamicSymbolProperties2 DynamicSymbolProps)
{
if (MouseMvePoint == null)
{
return;
} if (!IsClicked)
{
return;
} if (pPointCollection.PointCount > )
{
pPointCollection.RemovePoints(, pPointCollection.PointCount);
} if (pPointCollection.PointCount > )
{
if (IsMoved)
{
Radius = CircleRadius(pPointCollection.Point[], MouseMvePoint); } points = CirclePointCollection(pPointCollection.Point[], Radius, );
} DynamicSymbolProps.SetScale(esriDynamicSymbolType.esriDSymbolMarker, 6.0f, 6.0f);
DynamicSymbolProps.SetColor(esriDynamicSymbolType.esriDSymbolMarker, 255.0f, 0.0f, 0.0f, 1.0f);
DynamicDisplay.DrawMarker(CenterPoint); DynamicSymbolProps.SetScale(esriDynamicSymbolType.esriDSymbolMarker, 1.0f, 1.0f);
DynamicSymbolProps.SetColor(esriDynamicSymbolType.esriDSymbolMarker, 255.0f, 0.0f, 0.0f, 1.0f);
DynamicDisplay.DrawPolyline(points); DynamicSymbolProps.SetScale(esriDynamicSymbolType.esriDSymbolMarker, 1.0f, 1.0f);
DynamicSymbolProps.SetColor(esriDynamicSymbolType.esriDSymbolMarker, 255.0f, 0.0f, 0.0f, 0.5f);
DynamicDisplay.DrawPolygon(points);
}
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