WPF Chart DynamicDataDisplay的横坐标显示日期的解决方案
WPF Chart DynamicDataDisplay的横坐标显示日期的解决方案
我们打开DynamicDataDisplay的源码.内部自带有samples其中v2中带有一个名叫TooltipSample的例子.
如图...坐标尺默认计算的是横坐标的值.若我们的横坐标是以日期计算呢?则我们看源码
我们找到一个名为CursorCoordinateGraph的xaml文件.它负责渲染横纵坐标的值
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if
(xTextMapping !=
null
)
text = xTextMapping(xValue);
// doesnot have xTextMapping or it returned null
if
(text ==
null
)
text = GetRoundedValue(visible.Left, visible.Right, xValue);
if
(!String.IsNullOrEmpty(customXFormat))
text = String.Format(customXFormat, text);
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horizTextBlock.Text = text;
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目前我并没有找到那个类可以帮助显示横坐标为日期的值...若存在,请各位大神知点一下小弟
我目前的解决方案是修改源码.
我们在上述类中添加一个
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private
HorizontalDateTimeAxis dateAxis =
new
HorizontalDateTimeAxis();
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///
/// 水平方向是否显示日期
///
///
/// 水平方向是否显示日期
/// 修改人:pigwing
/// 修改日期:2010-11-19 9:57
///
public
bool
IsHorizontalDateTimeAxis
{
get
{
return
isHorizontalDateTimeAxis; }
set
{ isHorizontalDateTimeAxis = value; }
}
private
void
UpdateUIRepresentation()
{
UpdateUIRepresentation(Mouse.GetPosition(
this
));
}
///
/// 更新水平方向显示值
///
///
private
void
UpdateUIRepresentation(Point mousePos)
{
if
(Plotter2D ==
null
)
return
;
var
transform = Plotter2D.Viewport.Transform;
Rect visible = Plotter2D.Viewport.Visible;
Rect output = Plotter2D.Viewport.Output;
if
(!output.Contains(mousePos))
return
;
horizLine.X1 = output.Left;
horizLine.X2 = output.Right;
horizLine.Y1 = mousePos.Y;
horizLine.Y2 = mousePos.Y;
vertLine.X1 = mousePos.X;
vertLine.X2 = mousePos.X;
vertLine.Y1 = output.Top;
vertLine.Y2 = output.Bottom;
if
(UseDashOffset)
{
horizLine.StrokeDashOffset = (output.Right - mousePos.X) / 2;
vertLine.StrokeDashOffset = (output.Bottom - mousePos.Y) / 2;
}
Point mousePosInData = mousePos.ScreenToData(transform);
string
text =
null
;
if
(showVerticalLine)
{
double
xValue = mousePosInData.X;
{
if
(xTextMapping !=
null
)
text = xTextMapping(xValue);
// doesnot have xTextMapping or it returned null
if
(text ==
null
)
text = GetRoundedValue(visible.Left, visible.Right, xValue);
if
(!String.IsNullOrEmpty(customXFormat))
text = String.Format(customXFormat, text);
else
{
text = dateAxis.ConvertFromDouble(xValue).ToString();
}
horizTextBlock.Text = text;
}
double
width = horizGrid.ActualWidth;
double
x = mousePos.X + blockShift.X;
if
(x + width > output.Right)
{
x = mousePos.X - blockShift.X - width;
}
Canvas.SetLeft(horizGrid, x);
if
(showHorizontalLine)
{
double
yValue = mousePosInData.Y;
text =
null
;
if
(yTextMapping !=
null
)
text = yTextMapping(yValue);
if
(text ==
null
)
text = GetRoundedValue(visible.Bottom, visible.Top, yValue);
if
(!String.IsNullOrEmpty(customYFormat))
text = String.Format(customYFormat, text);
vertTextBlock.Text = text;
}
// by default vertGrid is positioned on the top of line.
double
height = vertGrid.ActualHeight;
double
y = mousePos.Y - blockShift.Y - height;
if
(y < output.Top)
{
y = mousePos.Y + blockShift.Y;
}
Canvas.SetTop(vertGrid, y);
Position = mousePos;
}
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cursorCoordinateGraph.IsHorizontalDateTimeAxis =
true
;
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日期便可以在下面正常显示了.
原文转自：
http://www.cnblogs.com/pigwing/archive/2010/11/22/1883832.html