`Stopping to add/subtract the appropriate angle to make various tools and`

`filters match the angle measured by the Measure Tool is a bit of an`

`interruption.`

`Is there an option somewhere (that I haven't found - I looked in the`

`toolbox and in Preferences) to tell the Measure Tool to show angles from`

`0 to 360 counterclockwise to match the angles shown by the Paint Tools?`

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`And a second option to tell the Measure Tool to show angles from 0 to`

`+/- 180 degrees to match the layer arbitrary rotation operation?`

`And a third option to tell the Measure Tool to show angles from 0 to 360`

`degrees *clockwise*, to match Filters that measure angles clockwise`

`instead of counterclockwise from the positive x-axis? And etc if there`

`are other starting points/directions for other Filters/operations that`

`take angles as user input?`

`If there aren't already such options available, maybe it would be a good`

`idea to have all angle measurements for all tools and filters be`

`counterclockwise from zero at the positive x-axis? Though some angle`

`measurements are more comfortably done starting from 0 degrees at the`

`positive y axis.`

Here are various ways current GIMP tools and operations measure angles:

`* The "click/shift to position and paint" angle measurements measure`

`counterclockwise from zero to 360 degrees, with zero being at the`

`positive x-axis.`

`* Filters/Blur/Circular Motion Blur and Linear Motion Blur angle of blur`

`both run from 0 to 360, counterclockwise (matches the Paint tools).`

`* The "View/Rotate View/Other Rotation Angle" angle of rotation`

`measurements from 0 to 360, but *clockwise* (opposite direction from the`

`Paint tools) from the positive x-axis.`

`* For arbitrary rotation of a layer, the rotation measurements from`

`always from 0 at the positive y-axis, running from -180`

`(counterclockwise) degrees to +180 (clockwise) degrees.`

`* The "Measure Tool" measures the angle from the closest of the positive`

`and negative x axes. So the maximum angle the Measure Tool will show is`

`90 degrees, which means there are four angles (one per quadrant) that`

`measure 1 degree, four angles that measure 2 degrees, four that measure`

`3 degrees, and so on, all the way from "just over 0" to "just under 90`

`degrees", with 0 and 90 degrees only being measured at two angles each,`

`being the positive and negative x and y axes, respectively.`

`Rotating a layer or selection to match an angle measured by the Measure`

`Tool requires some fairly complicated adding/subtracting. Let's say you`

`measured an angle of 27 degrees in the third quadrant. So starting from`

`0 rotation, add 90 degrees to get to the negative x-axis, and then add`

`27 more degrees, so rotate the layer or selection by 90+27=117 degrees.`

`Painting a straight line at a given angle that was measured using the`

`Measure Tool requires adding/subtracting 0 or 90 or 180 or 270 degrees,`

`depending on the direction of the painted line vs the angle measured by`

`the Measure Tool.`

And etc. Here are some possibly relevant bug reports:

`add easy way to set rotation angle to straighten an image:`

`https://bugzilla.gnome.org/show_bug.cgi?id=526719`

`Measure tool: saveable preset parameters:`

`https://bugzilla.gnome.org/show_bug.cgi?id=679562`

`The Angle range in brush dynamics should be -180°/+180° and not 0°-360°:`

`https://bugzilla.gnome.org/show_bug.cgi?id=787651`

`implement free angled guides:`

`https://bugzilla.gnome.org/show_bug.cgi?id=344109`

Best, Elle _______________________________________________ gimp-gui-list mailing list gimp-gui-list@gnome.org https://mail.gnome.org/mailman/listinfo/gimp-gui-list