[Qgis-user] QGIS 2.18 -Changing layer rule-based style transparency

[Tudorache, Marian]

In 2.18 it crush at this line
symbol = symbolItem.symbol()

You should have symbol2() not symbol().
symbol = symbolItem.symbol2()

Thank you,
Marian

-----Original Message-----
From: Qgis-user <qgis-user-bounces at lists.osgeo.org> On Behalf Of Raymond Nijssen
Sent: Saturday, January 5, 2019 11:04 AM
To: qgis-user at lists.osgeo.org
Subject: Re: [Qgis-user] QGIS 2.18 -Changing layer rule-based style transparency

Already got it working, using the setLegendSymbolItem() on the renderer:


layer = iface.activeLayer()
renderer = layer.renderer()
symbolItems = renderer.legendSymbolItems()

for symbolItem in symbolItems:
     print(symbolItem)
     symbol = symbolItem.symbol()
     color = symbol.color()
     color.setAlpha(255 * 0.8)
     symbol.setColor(color)
     renderer.setLegendSymbolItem(symbolItem.ruleKey(), symbol)

layer.triggerRepaint()



No clue if it will run in 2.18, expecting not. Hoping you can upgrade.

Raymond

On 05-01-19 13:22, Raymond Nijssen wrote:
> Hi Marian,
>
> As I understand you want to set every symbol in your rule based
> classification to 80% transparent (instead of the entire layer)?
>
> I tried to write a qgis (v3.4) script but unfortunately it crashes my
> qgis. So I hope somebody here can correct it, or maybe you will find
> the solution yourself.
>
> I'm doing many prints to see the return values. The crash happens when
> in line 18: symbolItem.setSymbol(symbol)
>
> ---
>
> layer = iface.activeLayer()
>
> renderer = layer.renderer()
>
> symbolItems = renderer.legendSymbolItems()
> print(symbolItems)
>
> for symbolItem in symbolItems:
>      print('---')
>      print(symbolItem)
>      symbol = symbolItem.symbol()
>      print(symbol)
>      color = symbol.color()
>      print(color.name(1))
>      color.setAlpha(255*0.8)
>      print(color.name(1))
>      symbol.setColor(color)
>      symbolItem.setSymbol(symbol) # !!! this makes qgis crash
>
> layer.triggerRepaint()
>
> ---
>
> When crashing, qgis outputs:
>
> QGIS died on signal 11Could not attach to process.  If your uid
> matches the uid of the target process, check the setting of
> /proc/sys/kernel/yama/ptrace_scope, or try again as the root user.
> For more details, see /etc/sysctl.d/10-ptrace.conf
> ptrace: Operation not permitted.
> No thread selected
> No stack.
> gdb returned 0
> Aborted (core dumped)
>
> ---
>
> Kind regards,
> Raymond
>
>
> On 04-01-19 22:32, Tudorache, Marian wrote:
>> Hi,
>>
>> I have a polygon type vector layer with rule-based style.
>>
>> I need to change programmatically the layer transparency.
>>
>> I used the following code:
>>
>> layer = iface.activeLayer()
>>
>> layer.setTransparency(80)
>>
>> layer.triggerRepaint()
>>
>> This works only if I want to see layers which are under the active
>> one but it does not work for the features inside active layer.
>>
>> When there are identical polygons which overlap within active layer,
>> I can only see the top one. If I select a polygon which is underneath
>> it is not displayed as selected.
>>
>> I can make it work if I manually open the layer style and double
>> click on rule to open Rule properties and set the transparency for the rule.
>>
>> How can I change the rule transparency programmatically?
>>
>> Thank you,
>>
>> Marian
>>
>>
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