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(Eva)  How to add symbols outsite plot area? |
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| Posted by Eva on Jan-16-2016 05:44 | |||||
| Hello Peter, I need to add a symbol to my Gantt Chart to the end of a bar that indicates that the bar was truncated. I came up with an indicator shown in a green circle in the "Desired Output" file. It would consist of a vertical dash line, horizontal line, and a right triangle symbol. Let's say I have one bar that needs to be truncated at position x[] = {0}, and the chart end date is 1/1/2046. To accomplish that I'm doing the following (I use Java): //draw arrow 10 pixels to the right of the chartEndDate c.addScatterLayer(,,, Chart.RightTriangleShape,.); //draw vertical the dash line 2 pixels inside the bar's right border chart.addLine( ..) //draw horizontal line 8 pixels to the right chart.addLine(.); The problem I have is when I use the addScatterLayer() method, the chart's time is extended to accommodate the arrow (see Actual output image) 1. How can I prevent so the the end date of the plot area is not extended? 2. I'm forced to call addScatterLayer() method before the chart.layout(), and addLine() after the chart.layout(). Is that correct? 3. Do you have a simpler way of creating the desired image? 4. What is the best way to calculate the x and y offsets to get the desired length of lines? Thank you, Eva
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| Re: How to add symbols outsite plot area? |
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| Posted by Peter Kwan on Jan-19-2016 00:34 | |
| Hi Eva, Are you adding the symbol with at a date after 1/1/2046 (eg. such as adding the symbol at 1/1/2047)? If the y-axis is auto-scaled, by default it will scale the axis so that it includes all the dates in your data, including the date in the scatter layer, so the axis will be extended if your scatter points are outside the original date range. To achieve what you want, there are several methods. (a) If you are using ChartDirector 6.x, you can add the scatter point at 1/1/2046 and using the built-in ArrowSymbol. See the followings for the built-in symbols in ChartDirector 6.x. http://www.advsofteng.com/doc/cdnet.htm#builtinsymbols.htm By default, this means the center of the arrow will be at 1/1/2046. You can then shift the arrow to the right using DataSet.setSymbolOffset by half the symbol size, so that the arrow end point will be at 1/1/2046. It is like: ScatterLayer layer = c.addScatterLayer(........); layer.getDataSet(0).setSymbolOffsert(symbolSize / 2, 0); (b) In earlier versions of ChartDirector, there is also vector layer that can be used to add an arrow pointing from 1/1/2016. See: http://www.advsofteng.com/doc/cdnet.htm#vector.htm (c) If you know the desired ending date on the axis, you can use Axis.setDateScale to set the end date. In this way, ChartDirector will use your end date instead of automatically computing one. It is like: //start date automatically determined, end date set to the specified date c.yAxis().setDateScale(Chart.NoValue, Chart.CTime(myDate)); (d) I think for recent versions of ChartDirector (I do not remember which version this feature is available), you can add the gantt chart layer, then call XYChart.layoutAxes to fix the axis, then add the scatter layer. For the vertical dash line ending the bar, you may consider to add a box-whisker layer with just one whisker, like: http://www.advsofteng.com/doc/cdnet.htm#markbar.htm The above is for a vertical bar chart, but it can be applied to a horizontal box-whisker layer as well. For bars that does not require the symbol, set the value of the whisker to Chat.NoValue. If you do want to compute the end points of the lines, the XYChart.getXCoor and XYChart.getYCoor can be used after calling BaseChart.layout. For the length of the vertical dash line in x-axis unit, it is equal to 1 minus the data gap, which is configurable with BaseBoxLayer.setDataGap. The default gap is 0.75. Hope this can help. Regards Peter Kwan | |