I am trying to move the position of a label that i am setting at a specific point on my chart line to explain what the line is and what the value used was to create the line. The problem i am encountering is that the label goes right through the line. Is there a way that i can Move the label to the right to keep it from crossing lines.
Here is how i am setting the Label
chart1.Series["ZAV"].Points[average + (average / 2)].Label =
string.Format("ZaV = {0:n2}", zavSG);
Work Around
Although this doesn't exactly answer my original question that I posted, this is what I did. I made a new Series added one point at the location I wanted the label, in my case the very top right of my graph, and set the label to that point. In the chart properties I set the chart series properties for SmartLabelStyle to not allow the label outside the plot area.
double maxPointX = chart1.ChartAreas[0].AxisX.Maximum;
double maxPointY = chart1.ChartAreas[0].AxisY.Maximum;
chart1.Series["Series6"].Points.AddXY(maxPointX, maxPointY);
chart1.Series["Series6"].Points[0].Label = string.Format("ZaV = {0:n2}", zavSG);
chart1.Series["Series6"].SmartLabelStyle.Enabled = true;
Related
I have a c# RangeBar chart with about 25 labels on the AxisX. Depending on my live data, some of these labels have visible data points in the chart. Typically about 3/4 of the 25 labels don't have any data points. All horizontal gridlines are enabled, which makes the chart a bit cluttered. Especially for data points that are further away on the AxisY, it's difficult to distinguish at a glance to what label on the AxisX they belong.
My idea is to differentiate the AxisX labels that have visible data points either by giving their gridline a different color, a different style, or to completely remove gridlines of AxisX labels that have no corresponding data points. Is this even possible? Because all controllable properties and documentation I have found so far is regarding gridline styles of the entire chart.
Btw: Only showing AxisX labels that have data points is not an option.
Thanks in advance.
To reduce clutter you could use the axis.Interval property.
But each line will still have the same style, either of major or of the minor lines.
You could add VerticalLineAnnotations for selected points or try StripLines. Both can be styled freely.
Here is an example of a normal line chart, with lines randomly added to a few points:
The same result can be achieved by either Annotations or Striplines. The blue lines are StripLine and the red ones Annotations. Here are two functions to add a colored line to a DataPoint:
void AddStripLine(Chart chart, ChartArea ca, DataPoint dp, Color col)
{
Axis ax = ca.AxisX;
StripLine sl = new StripLine();
sl.BorderColor = col;
sl.IntervalOffset = dp.XValue;
sl.Interval = 0;
sl.StripWidth = 0;
sl.BorderWidth = 1;
ax.StripLines.Add(sl);
}
If you look very closely you'll see that the only visual difference is that the former are below, the latter above all other chart elements.
void AddAnnotation(Chart chart, ChartArea ca, DataPoint dp, Color col)
{
Axis ay = ca.AxisY;
VerticalLineAnnotation vl = new VerticalLineAnnotation();
vl.LineColor = col;
vl.AnchorDataPoint = dp;
vl.IsInfinitive = true;
vl.LineWidth = 1;
vl.Height = ay.Maximum - ay.Minimum;
vl.ClipToChartArea = ca.Name;
chart.Annotations.Add(vl);
}
For Bar charts use HorizontalLineAnnotations and anchor to the correct axis...
Using Annotatons is in fact the more natural way, since each is an individual object. StripLines are too, but are repeated at intervals . To avoid visible repetiton each needs to have suitable offsets and intervals to be determined for each. But it isn't hard to do either way.
Also note that the both types of lines lines are anchored to their DataPoints and will move with them e.g. when chart is resized..
I have some string labels that are associated with a number each.
I've created a Chart element with one ChartArea and one Series which is using the SeriesChartType.Bar type to show my labels on the x-axis (which, confusingly, is the vertical axis when using the Bar type, but anyway...) and show the number as a bar next to it.
Since I have many labels that don't fit on the screen at once, I "enabled" the scrollbar using the Zoom method in my Paint event handler like this:
private void chart1_Paint(object sender, PaintEventArgs e)
{
var scaleView = chart1.ChartAreas.First().AxisX.ScaleView;
var pos = double.IsNaN(scaleView.Position) ? 0.0 : scaleView.Position;
scaleView.Zoom(pos, pos + chart1.Height / 22.0);
}
I don't know if this is the proper way to do that, but it does (almost) what I want:
show the scrollbar if there are too many data points (labels) to fit on the screen
update the visible area properly when the window is resized
There is only one annoying thing: If due to scrolling a long label appears in the visible area or disappears, the area occupied by the labels is adjusted to the longest visible label. I hope these screenshots explain what I mean:
Here one long label is visible (at the bottom):
Here I scrolled up by one unit so that the long label is not visible any more:
This is super annoying during scrolling as everything gets rescaled whenver a long label appears or disappears.
How to fix the area occupied by the labels to always fit the longest label in the series, no matter if it is currently visible or not? I tried IsLabelAutoFit = false for both, x- and y-axis, but that doesn't help.
Ok, I've got it. I used
chartArea.InnerPlotPosition.Auto = false;
InnerPlotPosition.X = 33.333;
to give one third of the chart area to the labels and the other two thirds to the bars.
InnerPlotPosition.Auto = false makes this fixed so that it doesn't update while scrolling.
I have created a chart in the image below and I need to insert in addition to the existing labels, the end labels on the extreme left and right of the x-axis. There are numerous datapoints and therefore I cannot set the interval to 1 for the labels as they'll clutter the axis. I have already tried setting the property
chartHistory.ChartAreas[0].AxisX.LabelStyle.IsEndLabelVisible = true;
but it doesn't seem to work. How can I achieve this?
You may try:
chartHistory.ChartAreas[0].AxisX.IsMarginVisible = true;
chartHistory.ChartAreas[0].AxisX.LabelStyle.IsEndLabelVisible = true;
Or probably you will have to add the labels yourself,
you can either use DataPoint.AxisLabel:
chartHistory.Series[0].Points[0].AxisLabel = "5/4/2010";
or more flexibly:
chartHistory.Series[0].Points[0].AxisLabel =
System.DateTime.FromOADate(chartHistory.Series[0].Points[0].XValue).ToShortDateString();
(and the same for the last point in series)
or you can add a custom label to the AxisX control:
chartHistory.ChartAreas[0].AxisX.CustomLabels.Add(0, 20, "5/4/2010");
See also this answer and this answer.
How does one set the alignment of text within a chart legend object? I've tried using:
myChartName.Legends["mySeriesName"].Alignment = stringAlignment.Near
With no effect. I've also tried to create custom legend items, again resulting in no effect. Text is ALWAYS centered (along with the series marker) in the legend "box". The only text I have been able to align is the title, but I don't need titles in my application.
My research to date says the legend object is basically a table with (by default) two cells. If that is the case there should be a way to access those cells and manipulate them as table cells. So, what gives? Why can't I access the text alignment properties of the legend object? Clearly, there is something I'm missing, but for the life of me I can't seem to figure this out. Quite frustrating.
Problem solved. The CustomItem approach wasn't working either, so I tried using the LegendCellColumn Class.
I changed the LegendStyle from Column to Row, then added two CellColumns, one for the series symbol and one for the legend text. Set the alignment, margins, and column widths (that turned out to be the trick), and voila; a legend that looks like I want. Here's the code for anyone with a similar issue.
chartSel.Legends[ySeries.Name].CellColumns.Add(new LegendCellColumn("", LegendCellColumnType.SeriesSymbol, ""));
chartSel.Legends[ySeries.Name].CellColumns[0].Alignment = ContentAlignment.TopLeft;
chartSel.Legends[ySeries.Name].CellColumns[0].Margins = new System.Windows.Forms.DataVisualization.Charting.Margins(0, 0, 1, 1);
chartSel.Legends[ySeries.Name].CellColumns[0].MinimumWidth = 250;
chartSel.Legends[ySeries.Name].CellColumns[0].MaximumWidth = 250;
chartSel.Legends[ySeries.Name].CellColumns.Add(new LegendCellColumn("", LegendCellColumnType.Text, ySeries.Name));
chartSel.Legends[ySeries.Name].CellColumns[1].Alignment = ContentAlignment.MiddleLeft;
chartSel.Legends[ySeries.Name].CellColumns[1].Margins = new System.Windows.Forms.DataVisualization.Charting.Margins(0, 0, 1, 1);
chartSel.Legends[ySeries.Name].CellColumns[1].MinimumWidth = 1500;
chartSel.Legends[ySeries.Name].CellColumns[1].MaximumWidth = 1500;
It's probably not the most efficient way to do it, but it works. Technically, the legend symbol and text are still centered in the object, but because I'm forcing the widths of the two columns it has the appearance of being left-justified.
Hopefully, this may help another newbie like me avoid days of consternation.
My understanding is that Legend alignment relates to the Docking property, not really how the text is aligned within the legend. So setting Alignment to Near means positioning the legend box near the Docking direction.
It is quite hard to explain this textually. The MS Chart Samples have a subsection named Chart features -> Legends -> Style and Auto Positioning which will help you play with those two properties and understand how they are meant to work.
For inner legend alignment, you may need to use Legend.CustomItems and define LegendCell individually.
chart.Legends["Default"].CustomItems.Clear();
chart.Legends["Default"].CustomItems.Add(new LegendItem("LegendItem", Color.Red, ""));
chart.Legends["Default"].CustomItems[0].Cells.Add(new LegendCell(LegendCellType.Text, "My text", ContentAlignment.MiddleLeft));
This is described inside the Chart features -> Legends -> Legend Cells section of the samples.
While continuing to try to figure this out I stumbled on this tidbit of info from the following MSDN library page:
http://msdn.microsoft.com/en-us/library/dd456711(v=vs.100).aspx
"NOTE: You cannot adjust the individual legend items and cells in the Chart.Legends collection. To adjust them, use custom legend items."
So, back to the CustomItem route. I've got this code gleaned from several sources (including you, Dominique, thanks):
chartSel.Legends.Add(ySeries.Name);
chartSel.Series[ySeries.Name].IsVisibleInLegend = false;
chartSel.Legends[ySeries.Name].CustomItems.Clear();
LegendItem li = new LegendItem();
li.ImageStyle = LegendImageStyle.Line;
li.Cells.Add(LegendCellType.SeriesSymbol, "", ContentAlignment.TopLeft);
li.Cells[0].BackColor = Color.CornflowerBlue; //color is only to see the cell bounds
li.Cells.Add(LegendCellType.Text, ySeries.Name, ContentAlignment.TopLeft);
li.Cells[1].BackColor = Color.Aquamarine; //color is only to see the cell bounds
chartSel.Legends[ySeries.Name].CustomItems.Add(li);
From what I can find it should work, but it doesn't. It results in a legend object with two cells; the first is empty and the second has left-justified text. I tried to post an image of it, but the system says I'm not yet worthy.
Why there is no line for the series symbol is also a mystery, but that's another problem to solve. The text justification issue is my main concern at the moment. It looks like the text within the cells is left-justified as desired, but the cells themselves are centered in the legend object; not what I wanted. I want those cells to be left-justified in the object too, so the first cell is against the left edge of the legend object.
Ideas?
When the Microsoft chart control is zoomed in, the values of the labels and grid lines often looks like 38.2, 39.2, 40.2, 41.2 ... rather than 38,39,40,41. I tried to set the interval offset to correct this by using the code shown below without success.
myChart.ChartAreas[0].AxisX.MinorGrid.IntervalOffset = myChart.ChartAreas[0].AxisY.ScaleView.ViewMinimum % 1;
myChart.ChartAreas[0].AxisX.IntervalOffset = myChart.ChartAreas[0].AxisY.ScaleView.ViewMinimum % 1;
What is the proper way to get the major and minor grid-lines and labels to be drawn starting at a specific value?
Your problems might be caused by margins being added. Make sure you set
myChart.ChartArea[0].AxisX.IsMarginVisible = false;