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STR #1839
| Application: | FLTK Library |
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| Status: | 5 - New |
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| Priority: | 1 - Request for Enhancement, e.g. asking for a feature |
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| Scope: | 3 - Applies to all machines and operating systems |
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| Subsystem: | Unassigned |
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| Summary: | Dial should have no bounds |
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| Version: | 2.0-feature |
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| Created By: | Jonathan |
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| Assigned To: | Unassigned |
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| Fix Version: | Unassigned |
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| Update Notification: | |
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Trouble Report Files:
[ Post File ]No files
Trouble Report Comments:
[ Post Text ]
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| #1 | Jonathan
03:19 Nov 30, 2007 |
| It would be useful to have a dial-widget without bounds.
I wanted to use it for an angle-input and it is realy bad, if the user wants to change from 355 to 5 degrees, and has to go round the whole circle.
It would be realy nice to have an option for this. | |
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| #2 | thorha
16:28 Nov 30, 2007 |
| This is easy to do with the existing functionality.
Make your callback something like this:
void angle_cb(Widget *v, void *ob)
{
Dial *sd;
sd = (Dial*)v;
float val;
float angle;
val = (float) sd->value();
// Limit values, this makes the dial to rotate without limits
if(val>0.75) sd->value(val-0.5);
if(val<0.25) sd->value(val+0.5);
// Get the range back
angle = 720 * val;
if (angle >= 360.0) angle-=360.0;
// Do something with angle
}
When you create the dial you do it like this:
test_dir = new LineDial(505,130,200,200,"Test dial angles");
test_dir->angles(-180,540);
test_dir->value(0.5);
test_dir->callback(angle_cb,this);
Regards
Thor Henning Amdahl | |
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