raster legend in map composer

[qgib]

Author Name: Redmine Admin (Redmine Admin)
Original Redmine Issue: 47

Redmine category:rasters
Assignee: Marco Hugentobler

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The map composer misses a raster legend.

[qgib]

Author Name: leo-lami - (leo-lami -)

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We need a continuos (rx. for dtm raster) or category value legend (best if it is possible choise it) about all the raster load in the map canvas,
Ask me if you need same other information.

[qgib]

Author Name: Tim Sutton (Tim Sutton)

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On second thoughts this is probably handled using the enhancement type and not a fake milestone. Returning to 1.0.1 milestone, please ignore last milestone change. Also changed assigned to tim since Radim is no longer active in QGIS.

[qgib]

Author Name: Marco Hugentobler (@mhugent)

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I think that this is now more a raster problem than a composer problem. The composer now shows the raster icon from the legend. Once the raster layer provides a detailed raster legend (e.g. classification values), composer can also do so.

[qgib]

Author Name: ersts - (ersts -)

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This actually is already possible

For Paletted, Pseudo and Freakout it would looks something like this, get the current shader (only one per raster layer)
*myRasterShader = [[RasterLayer]]->getRasterShader()

loop through all values you want to show in the legend
for(int runner = [[RasterLayer]]->getMinimumValue(band a); runner <= [[RasterLayer]]->getMaximumValue(band a); runner++)
{
if(myRasterShader->generateShadedValue((double)runner, &red, &green, &blue)
{
//set the color of your object
color_my_legend_item(new QColor(red, green, blue))
}
}

[qgib]

Author Name: Paolo Cavallini (@pcav)

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Then would it be fasible adding it as a last minute 1.0 feature? It would be great to have it

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Author Name: aprasad - (aprasad -)

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Please implement raster legend display (so that you can define custom breaks of cell values and view them in the colors you want - like is available in [[ArcView]] 3.x) - I feel qGIS will not impresss new users if it does not have this basic functionality in place.

[qgib]

Author Name: Paolo Cavallini (@pcav)

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Thanks Marco

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• resolution was configured as fixed

[qgib]

Author Name: Paolo Cavallini (@pcav)

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• status_id was changed from Open to Resolved

[qgib]

Author Name: Anita Graser (@anitagraser)

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• pull_request_patch_supplied was configured as 0
• status_id was changed from Resolved to Closed