Yes, that got it... mode 360 is 0 and a sweep of 0 means nothing is drawn...
Thanks! On Feb 3, 4:03 pm, Kostya Vasilyev <[email protected]> wrote: > Paul, > > Tried it out (Motorola Milestone). > > The following works: > > // ----- > Path androidPath = new Path(); > Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG); > paint.setStyle(Paint.Style.STROKE); > paint.setColor(Color.RED); > paint.setStrokeWidth(5); > androidPath.moveTo(0, 0); > androidPath.lineTo(110, 110); > androidPath.arcTo(new RectF(10, 10, 210, 210), 0, 180); > canvas.drawPath(androidPath, paint); > // ----- > > The following does not draw the oval, but does draw the line segment to > its first point: > > androidPath.arcTo(new RectF(10, 10, 210, 210), 0, 360); > > This makes sense, since the docs do say that the sweep angle is treated > modulo 360 - but it only says that for one of the three arc-related methods: > > http://developer.android.com/reference/android/graphics/Path.html#arc..., > float, float, boolean) > > Looks like a documentation bug to me. > > This works too and I really can't tell the difference compared to a full > 360: > > androidPath.arcTo(new RectF(10, 10, 210, 210), 15, 359.9f); > > Just for kicks, being short by one tenth of a degree produces a > positioning error of 0,0017 pixels for each radius pixel. > > -- Kostya > > 03.02.2011 23:40, Paul пишет: > > > > > I've tried a bunch of different combinations... here is what I have > > in onDraw, just trying to get this working: > > > Path androidPath = new Path(); > > Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG); > > paint.setStyle(Paint.Style.STROKE); > > paint.setColor(Color.BLACK); > > paint.setStrokeWidth(3); > > androidPath.moveTo(0, 0); > > androidPath.arcTo(new RectF(10, 10, 110, 110), 0, 360, true); > > canvas.drawPath(androidPath, paint); > > > Nothing is shown. > > > On Feb 3, 11:49 am, Kostya Vasilyev<[email protected]> wrote: > >> How about making the arc the only item in the path, and also trying > >> different ops: fill vs. stroke? > > >> 03.02.2011 19:41, Paul пишет: > > >>> Tried, no difference... > >>> On Feb 3, 11:21 am, Kostya Vasilyev<[email protected]> wrote: > >>>> Paul, > >>>> Perhaps you could try path.arcTo(oval, 0, 180, *true*); ? > >>>> 03.02.2011 19:03, Paul ?????: > >>>>> Also, have tested this in both the emulator for Froyo, as well as on > >>>>> Froyo hardware and the arcs are not being displayed. Looked through > >>>>> the source for arcTo, which calls a native function in Path.cpp, and > >>>>> there doesn't appear to be a reason the above input would fail, given > >>>>> that the Path.cpp can draw the exact same oval using addOval(). > >>>>> Paul > >>>>> On Feb 3, 10:19 am, Paul<[email protected]> wrote: > >>>>>> I am trying to add an arc to a path, but nthing gets drawn with each > >>>>>> call. I have ensured that the passed RectF oval is dimensioned > >>>>>> properly, and calls to Path.addOval(oval, Path.Direction.CW) work > >>>>>> perfectly, but calls to either of Path.addArc(oval, 0, 180) and > >>>>>> Path.arcTo(oval, 0, 180) fail (nothing gets drawn). > >>>>>> Any suggestions on what I might be doing wrong? > >>>>>> Thanks! > >>>> -- > >>>> Kostya Vasilyev -- WiFi Manager + pretty widget > >>>> --http://kmansoft.wordpress.com > >> -- > >> Kostya Vasilyev -- WiFi Manager + pretty widget > >> --http://kmansoft.wordpress.com > > -- > Kostya Vasilyev -- WiFi Manager + pretty widget > --http://kmansoft.wordpress.com -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
