Button to remove all pens from easy chart

Ignition
1

I am trying to make a trend window on my ignition dashboard. I am using the tag browser to pull pens into the chart, but I do not like the way you have to natively remove the pens with the "x". I want to disable pen control, and add a button that will clear all the pens off the chart.

image
image2264×1985 417 KB

2

Consider using Legends instead of the pen control subwindow (it can be disabled).

3

I am using legends, but there is no way to remove pens from the trend with legends.

4

Yes, you can remove the row from the tagPens or pens dataset property of the EasyChart. That removes the pen. (Yes, you will need a button of your own to script it.)

5

I often group the pens and have multiple buttons along the top that show/hide the different groups using scripting. Something along the lines of

#grab all pens from the chart. this will be edited and then stored back to the chart
data = event.source.parent.getComponent('Easy Chart').pens

#define show/hide states
showGroup = {"HIDDEN":0, 'ENABLED':0}
hideGroup = {"HIDDEN":1, 'ENABLED':0}
newGroup = {"HIDDEN":0, 'ENABLED':0}

#selected group matches button text
selectedGroupName = event.source.text

#custom property
shown = event.source.showGroup

#initialize row at row 0
row = 0

#if group is currently being shown
if shown:
	#for each pen in the chart
	for row in range(data.rowCount):
		#get group name for pen
		groupName = data.getValueAt(row,"GROUP_NAME")
		#if group name matches button text
		if groupName == selectedGroupName:
			#hide group
			data = system.dataset.updateRow(data,row,hideGroup)
			#set custom property to false (group is hidden)
			event.source.showGroup = False
#group is currently being hidden
else:
	#for each pen in the chart
	for row in range(data.rowCount):
		#get group name for pen
		groupName = data.getValueAt(row,"GROUP_NAME")
		#if group name matches button text
		if groupName == selectedGroupName:
			#show group
			data = system.dataset.updateRow(data,row,showGroup)
			#set custom property to true (group is shown)
			event.source.showGroup = True

#write the re-configured pens dataset back to the chart
event.source.parent.getComponent('Easy Chart').pens = data

In this example the button text matches the group name.