/// <summary>
/// 测量工具
/// </summary>
internal MeasureTools(AxMapControl mapCtrl)
{
MapCtrl = mapCtrl;
_pointCollection = null;
_newPolygonFeedback = null;
_newLineFeedback = null;
_eMeasureType = 0;
IsSurveying = false;
}
/// <summary>
/// 地图测量操作
/// </summary>
public MapCtrlMeasure(AxMapControl mapCtrl)
{
MapControl = mapCtrl;
_pointCollection = null;
_newPolygonFeedback = null;
_newLineFeedback = null;
_eMeasureType = EMeasureType.None;
AreaPointCount = 0;
IsSurveying = false;
}
/// <summary>
/// 开始测角度,point为折线起点,测量结果为
/// Direction:当前线段的方向角，即与正北方向的夹角
/// Angle:当前线段与前一线段的夹角
/// 在Map的MouseDown事件中调用本方法
/// </summary>
/// <param name="point">折线起点</param>
public void AngleStart(IPoint point)
{
_eMeasureType = EMeasureType.Angle;
_newLineFeedback = new NewLineFeedbackClass {
Display = MapCtrl.ActiveView.ScreenDisplay
};
_newLineFeedback.Start(point);
_pointCollection = new PolylineClass();
object ep = System.Reflection.Missing.Value;
_pointCollection.AddPoint(point, ref ep, ref ep);
IsSurveying = true;
}
/// <summary>
/// 开始面积测量，point为多边形起点
/// </summary>
/// <param name="point">测量起点</param>
public void AreaStart(IPoint point)
{
_eMeasureType = EMeasureType.Area;
_newPolygonFeedback = new NewPolygonFeedbackClass {
Display = MapControl.ActiveView.ScreenDisplay
};
_newPolygonFeedback.Start(point);
_pointCollection = new PolygonClass();
object ep = System.Reflection.Missing.Value;
_pointCollection.AddPoint(point, ref ep, ref ep);
IsSurveying = true;
AreaPointCount = 1;
}
private double MeasureText(DrawingContext dc, string txtInfo, EMeasureType measureType)
{
double txtWidth = 0.0;
switch (measureType)
{
case EMeasureType.MeasureHeader:
txtWidth = this.MeasureHeaderText(dc, txtInfo);
break;
case EMeasureType.MeasureFooter:
txtWidth = this.MeasureFooterText(dc, txtInfo);
break;
default:
case EMeasureType.MeasureNormal:
txtWidth = this.MeasureNormalText(dc, txtInfo);
break;
}
return txtWidth;
}
protected string SplitFilePath(string filePath, Rect region, DrawingContext dc, EMeasureType measerHeader)
{
// eg: D:\...\CPCFC1.CFC;
if (string.IsNullOrEmpty(filePath))
return filePath;
filePath = filePath.Trim(new char[]{' ', '\\'});
int startIndex = filePath.IndexOf('\\');
int lastIndex = filePath.LastIndexOf('\\');
if (startIndex <= 0 || lastIndex <= 0)
return filePath;
string prefix = filePath.Substring(0, startIndex + 1);
string suffix = filePath.Substring(lastIndex);
string splitContent = filePath.Substring(startIndex + 1, lastIndex - startIndex - 1);
double prefixWidth = this.MeasureText(dc, prefix, measerHeader);
double suffixWidth = this.MeasureText(dc, suffix, measerHeader);
if (prefixWidth > region.Width)
return prefix + "...";
else if (prefixWidth + suffixWidth > region.Width)
return prefix + this.splitFromLeft(suffix, region.Width - prefixWidth, dc, measerHeader);
else
return prefix + this.splitFromRight(splitContent, region.Width - prefixWidth - suffixWidth, dc, measerHeader) + suffix;
}
/// <summary>
/// 对drawHeaderText与drawFooterText函数进行了封装，当字符串过长的时候，可以进行相关的字符串截取操作；
/// </summary>
private void drawText(DrawingContext dc, string text, Rect rcText, HorizontalAlignment hAlign, string regType, EMeasureType drawHeader)
{
try
{
if (this.IsOnlyFilePath(regType))
text = this.SplitFilePath(text, rcText, dc, drawHeader);
else
text = this.splitFromRight(text, rcText.Width, dc, drawHeader);
if (drawHeader == EMeasureType.MeasureHeader)
this.drawHeaderText(dc, text, rcText, hAlign);
else if (drawHeader == EMeasureType.MeasureFooter)
this.drawFooterText(dc, text, rcText, hAlign);
else
this.drawNormalText(dc, text, rcText, hAlign);
}
catch (Exception ee)
{
Trace.WriteLine("### [" + ee.Source + "] Exception: " + ee.Message);
Trace.WriteLine("### " + ee.StackTrace);
}
}
