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On 2/25/21 11:16 AM Manolo wrote:
There's now a new public API in FLTK 1.4 to support "drawing without
scaling factor",
in the form of a pair of functions that remove and then restore the
scaling factor:
float fl_remove_scale();
void fl_restore_scale(float s);
Thanks, that's great. The "naive" implementation to reset the scale
didn't work well on my macOS system (I think you know why) but with the
new API it works fine.
Almost. See below.
May I request to change fl_remove_scale() to fl_reset_scale() ? "Remove"
sounds strange in this context.
I attach the same example program modified to use this API.
Okay, works fine on Linux (not tested elsewhere). Your program doesn't
show any issues in my tests.
My own modified test program that demonstrates switching the scaling
factor back and forth after drawing the box and before drawing the label
fails in some situations. I attach my demo 'draw_unscaled.cxx' here. I
also attach 'draw_unscaled.png' which shows a failure situation.
If there's anything wrong with my test program, please tell me.
Otherwise this seems to be a bug.
What I found out with my demo: it's somehow interfering with the
transient scaling factor display window when the scaling is changed
(ctrl/+ or ctrl/-). I see very similar effects on macOS with cmd/+ or
cmd/- but I didn't test on Windows.
Note: I used fluid/Edit/Global FLTK Settings... to enable/disable the
scaling factor display. You need to restart the demo program for the
change to take effect.
There are different effects depending on the appearance of the transient
scaling factor display and which button has the focus:
(1) Transient scaling factor display OFF: works fine.
(2) Scaling factor display on and focus on "LABEL" button: fails almost
always.
(3) scaling factor display on and focus on "no op" button: fails
sumetimes but not always.
What I see is that there are two draw operations: one before the zoom
factor window is shown and one after it was removed (or at least it
appears so).
If I resize the window or click on another button and back on the LABEL
button the redraw works fine.
Can anybody else confirm this?
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Attachment:
draw_unscaled.png
Description: PNG image
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