View Issue Details
|ID||Project||Category||View Status||Date Submitted||Last Update|
|0002193||SkyChart||1-Software||public||19-09-18 00:54||19-10-06 16:08|
|Reporter||Joe Shuster||Assigned To||Patrick Chevalley|
|Product Version||4.1 SVN|
|Target Version||4.2||Fixed in Version||4.1 SVN|
|Summary||0002193: "Orient to Pole" labels are placed incorrectly.|
|Description||With "Orient to Pole" checked, the line from the pole to the midpoint of the baseline should be perpendicular to the baseline. Instead, CDC 4.1.1, beta 3899 positions the label so a line from the pole though the left edge of the baseline is perpendicular.|
CDC seems to calculate the correct point for the label and the correct text angle for the baseline. But instead of centering the text over the placement point, CDC starts the text at that placement point. You can see the error best with long labels, like Triangulum.
In the provided sample, you can see that the "Triangulum" and "Aries" labels have baselines that are perpendicular to the azimuth grid lines and the text starts at the grid line. Because of that, a line perpendicular to the _center_ of the text baseline won't pass through the pole/zenith. If the text was centered on that calculated label point and at the calculated angle, the label would be properly "oriented to the pole". IOW, the fix seems very simple: Shift the text so it's centered on the placement point.
|Steps To Reproduce||Check "Orient to Pole", enable Show Coordinates Grid|
Near zenith, examine labels (preferably with long text) with a left edge near an azimuth grid line.
See that a line through the center point of the text baseline will not pass through the "pole".
|Additional Information||There is an associated side issue: The language "to pole" is problematic. In the version of CDC I'm using, "Orient to Pole" causes a baseline orientation to the zenith. That's what I want, but the zenith isn't a pole.|
IMO, there should be a choice to orient to the screen (standard), NCP, SCP, nadir, and zenith.
As always, thanks for the great software!
|Tags||No tags attached.|
Thank you for the detailed description.
I will look what I can do to fix that. The problem is I cannot center the label for DSO or star because this hide the object itself behind the label. I will try a special processing for constellation label that must be centered on the position and in all case compute the rotation for the center of the label.
The term "pole" here refer to the current projection pole. This can be the celestial pole but also the ecliptic or the galactic pole. I agree this look strange for the alt/az projection but the zenith is the pole of this projection.
Maybe "orient to the current projection pole" is better? but a bit too long for the space in this screen.
Or "orient to pole or zenith" ?
This is fixed by :
I also replace the text "Orient to the pole" by "Orient to the pole or zenith".
This two change will be available in tomorrow beta version.
|19-09-18 00:54||Joe Shuster||New Issue|
|19-09-18 00:54||Joe Shuster||File Added: Show label not correctly oriented.jpg|
|19-09-18 17:35||Patrick Chevalley||Assigned To||=> Patrick Chevalley|
|19-09-18 17:35||Patrick Chevalley||Status||new => assigned|
|19-09-18 17:35||Patrick Chevalley||Target Version||=> 4.2|
|19-09-18 17:35||Patrick Chevalley||Description Updated||View Revisions|
|19-09-18 17:35||Patrick Chevalley||Steps to Reproduce Updated||View Revisions|
|19-09-18 17:35||Patrick Chevalley||Additional Information Updated||View Revisions|
|19-09-18 17:35||Patrick Chevalley||Note Added: 0005958|
|19-10-06 16:08||Patrick Chevalley||Status||assigned => resolved|
|19-10-06 16:08||Patrick Chevalley||Resolution||open => fixed|
|19-10-06 16:08||Patrick Chevalley||Fixed in Version||=> 4.1 SVN|
|19-10-06 16:08||Patrick Chevalley||Note Added: 0005992|