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/ChartDirector/Tracking Cursor/Track Box with Legend
Required plugins for this example: MBS ChartDirector Plugin
You find this example project in your Plugins Download as a Xojo project file within the examples folder: /ChartDirector/Tracking Cursor/Track Box with Legend
This example is the version from Wed, 13th Dec 2016.
Project "Track Box with Legend.xojo_binary_project"
Class App Inherits Application
Const kEditClear = "&Löschen"
Const kFileQuit = "Beenden"
Const kFileQuitShortcut = ""
End Class
Class Window1 Inherits Window
Control Canvas1 Inherits MyControl
ControlInstance Canvas1 Inherits MyControl
End Control
End Class
MenuBar MenuBar1
MenuItem FileMenu = "&Ablage"
MenuItem FileQuit = "#App.kFileQuit"
MenuItem EditMenu = "&Bearbeiten"
MenuItem EditUndo = "&Rückgängig"
MenuItem UntitledMenu1 = "-"
MenuItem EditCut = "&Ausschneiden"
MenuItem EditCopy = "&Kopieren"
MenuItem EditPaste = "&Einfügen"
MenuItem EditClear = "#App.kEditClear"
MenuItem UntitledMenu0 = "-"
MenuItem EditSelectAll = "&Alles auswählen"
End MenuBar
Class MyControl Inherits Canvas
EventHandler Sub MouseMove(X As Integer, Y As Integer) trackLineLegend x pic = c.makeChartPicture me.Invalidate End EventHandler
EventHandler Sub Open() // The data for the bar chart dim data0() as double = array(100.0, 125, 245, 147, 67) dim data1() as double = array(85.0, 156, 179, 211, 123) dim data2() as double = array(97.0, 87, 56, 267, 157) dim labels() as string = array("Mon", "Tue", "Wed", "Thur", "Fri") dim noOfPoints as integer = UBound(data0)+1 // Create a XYChart object of size 540 x 375 pixels c = new CDXYChartMBS(540, 375) // Add a title to the chart using 18 pts Times Bold Italic font call c.addTitle("Average Weekly Network Load", "timesbi.ttf", 18) // Set the plotarea at (50, 55) and of 440 x 280 pixels in size. Use a vertical gradient color // from light blue (f9f9ff) to blue (6666ff) as background. Set border and grid lines to white // (ffffff). call c.setPlotArea(50, 55, 440, 280, c.linearGradientColor(0, 55, 0, 335, &hf9f9ff, &h6666ff), -1, &hffffff, &hffffff) // Add a legend box at (50, 28) using horizontal layout. Use 10pts Arial Bold as font, with // transparent background. call c.addLegend(50, 28, false, "arialbd.ttf", 10).setBackground(CDBaseChartMBS.kTransparent) // Set the x axis labels call c.xAxis.setLabels(labels) // Draw the ticks between label positions (instead of at label positions) c.xAxis.setTickOffset(0.5) // Set axis label style to 8pts Arial Bold call c.xAxis.setLabelStyle("arialbd.ttf", 8) call c.yAxis.setLabelStyle("arialbd.ttf", 8) // Set axis line width to 2 pixels c.xAxis.setWidth(2) c.yAxis.setWidth(2) // Add axis title call c.yAxis.setTitle("Throughput (MBytes Per Hour)") // Add a multi-bar layer with 3 data sets dim layer as CDBarLayerMBS = c.addBarLayer(CDBaseChartMBS.kSide) call layer.addDataSet(data0, &hff0000, "Server #1") call layer.addDataSet(data1, &h00ff00, "Server #2") call layer.addDataSet(data2, &hff8800, "Server #3") // Set bar border to transparent. Use glass lighting effect with light direction from left. call layer.setBorderColor(CDBaseChartMBS.kTransparent, CDBaseChartMBS.glassEffect(CDBaseChartMBS.kNormalGlare, CDBaseChartMBS.kLeft)) // Configure the bars within a group to touch each others (no gap) layer.setBarGap(0.2, CDBaseChartMBS.kTouchBar) pic = c.makeChartPicture me.Invalidate // fix some properties if set wrong in IDE me.DoubleBuffer = false me.EraseBackground = false #if RBVersion >= 2013.0 then me.Transparent = False #endif End EventHandler
EventHandler Sub Paint(g As Graphics, areas() As REALbasic.Rect) if pic <> nil then g.DrawPicture pic, 0, 0 end if End EventHandler
Sub trackLineLegend(mouseX as integer) // Clear the current dynamic layer and get the DrawArea object to draw on it. dim d as CDDrawAreaMBS = c.initDynamicLayer // The plot area object dim plotArea as CDPlotAreaMBS = c.getPlotArea // check if we are outside the plotArea if mousex<plotArea.getLeftX then Return if mousey<plotArea.getTopY then Return if mousex>plotArea.getRightX then Return if mousey>plotArea.getBottomY then Return // Get the data x-value that is nearest to the mouse dim xValue as double = c.getNearestXValue(mouseX) // Compute the position of the box. This example assumes a label based x-axis, in which the // labeling spacing is one x-axis unit. So the left and right sides of the box is 0.5 unit from // the central x-value. dim boxLeft as integer = c.getXCoor(xValue - 0.5) dim boxRight as integer = c.getXCoor(xValue + 0.5) dim boxTop as integer = plotArea.getTopY dim boxBottom as integer = plotArea.getBottomY // Draw the track box d.rect(boxLeft, boxTop, boxRight, boxBottom, &h000000, CDBaseChartMBS.kTransparent) // Container to hold the legend entries dim legendEntries() as string // Iterate through all layers to build the legend array dim u as integer = c.getLayerCount-1 for i as integer = 0 to u dim layer as CDLayerMBS = c.getLayerByZ(i) // The data array index of the x-value dim xIndex as integer = layer.getXIndexOf(xValue) // Iterate through all the data sets in the layer dim uu as integer = layer.getDataSetCount-1 for j as integer = 0 to uu dim dataSet as CDDataSetMBS = layer.getDataSetByZ(j) // Build the legend entry, consist of the legend icon, the name and the data value. dim dataValue as double = dataSet.getValue(xIndex) if ((dataValue <> CDBaseChartMBS.kNoValue) and (dataSet.getDataColor <> CDBaseChartMBS.kTransparent)) then dim legendEntry as string legendEntry = dataSet.getLegendIcon + " " + dataSet.getDataName + ": " + c.formatValue(dataValue, "{value|P4}") legendEntries.Append legendEntry end if next next // Create the legend by joining the legend entries if UBound(legendEntries) >= 0 then dim legend as string legend = "<*block,bgColor=FFFFCC,edgeColor=000000,margin=5*><*font,underline=1*>" + c.xAxis.getFormattedLabel(xValue) + "<*/font*>" for i as integer = UBound(legendEntries) downto 0 legend = legend + "<*br*>" + legendEntries(i) next legend = legend + "<*/*>" // Display the legend at the bottom-right side of the mouse cursor, and make sure the legend // will not go outside the chart image. dim t as CDTTFTextMBS = d.text(legend, "arialbd.ttf", 8) t.draw(min(mouseX + 12, c.getWidth - t.getWidth), min(mouseY + 18, c.getHeight - t.getHeight), &h000000, CDBaseChartMBS.kTopLeft) t.destroy end if End Sub
Note "Notes"
This sample program demonstrates a track cursor programmed with the following features: * A box that horizontally centers around the x data value nearest to the mouse cursor. * A floating legend box that moves with the mouse cursor, displaying the data values at the x data value nearest to the mouse cursor. The code first draws the chart. We hide tracking if mouse is out of plotarea. The track cursor is configured to automatically hide itself when the mouse leaves the plot area. The trackBoxLegend method is the routine that draws the track cursor. Its key elements are: * To draw dynamic contents on the chart, the code obtains the DrawArea object for drawing on the dynamic layer of the chart using BaseChart.initDynamicLayer. * The nearest x data value is obtained using XYChart.getNearestXValue. * The code draws a rectangle that horizontally spans from (x - 0.5) to (x + 0.5) with DrawArea.rect. The +/- 0.5 offset is the suitable value to use for a label based x-axis (that is, for axis set up with Axis.setLabels or Axis.setLabels2). For this type of axis, the label distance is assumed to be 1 x-axis unit irrespective of what are the labels, so an offset of 0.5 refers to the middle position between two labels. * The code then iterates through all data sets in all layers to find all the data points at the nearest x data value. For each of these points, it formats a legend entry for the point, which consists of the data set icon (obtained using DataSet.getLegendIcon), data set name (obtained using DataSet.getDataName), and the data value (obtained using DataSet.getValue). * Finally, the code combines all the legend entries into a legend box and draws it near the mouse cursor using DrawArea.text.
Property c As CDXYChartMBS
Property pic As picture
End Class
End Project

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The items on this page are in the following plugins: MBS ChartDirector Plugin.

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