calculate result text size before canvas.drawText()

[Igor Khromov]

Hi guys!

I want to create custom textField and I need to draw separate char or text on canvas. How to define canvas size before it's creation? For example I need to draw symbol "X" with some typeFace created from .ttf file, how I can calculate bitmap size before create canvas?

And do you know any textField implementations based on Skia? And if (know==YES), where I can find them)?

Thanks a lot in advance :-) !!!

[Brian Salomon]

SkPaint has a measureText() method which returns the width of a text run.

Brian

--
You received this message because you are subscribed to the Google Groups "skia-discuss" group.
To unsubscribe from this group and stop receiving emails from it, send an email to skia-discuss...@googlegroups.com.
To post to this group, send email to skia-d...@googlegroups.com.
Visit this group at https://groups.google.com/group/skia-discuss.
For more options, visit https://groups.google.com/d/optout.

[Cary Clark]

measureText() also takes an optional parameter that returns the bounds. And, for completeness, if you set the verticalText flag, it returns the height :)

Cary

On Thu, Sep 8, 2016 at 8:58 AM, 'Brian Salomon' via skia-discuss <skia-d...@googlegroups.com> wrote:

SkPaint has a measureText() method which returns the width of a text run.

Brian

On Thu, Sep 8, 2016 at 8:30 AM Igor Khromov <khromo...@gmail.com> wrote:

Hi guys!

I want to create custom textField and I need to draw separate char or text on canvas. How to define canvas size before it's creation? For example I need to draw symbol "X" with some typeFace created from .ttf file, how I can calculate bitmap size before create canvas?

And do you know any textField implementations based on Skia? And if (know==YES), where I can find them)?

Thanks a lot in advance :-) !!!

--
You received this message because you are subscribed to the Google Groups "skia-discuss" group.

To unsubscribe from this group and stop receiving emails from it, send an email to skia-discuss+unsubscribe@googlegroups.com.

To post to this group, send email to skia-d...@googlegroups.com.
Visit this group at https://groups.google.com/group/skia-discuss.
For more options, visit https://groups.google.com/d/optout.

--

You received this message because you are subscribed to the Google Groups "skia-discuss" group.

To unsubscribe from this group and stop receiving emails from it, send an email to skia-discuss+unsubscribe@googlegroups.com.

[Hal Canary]

for example: https://fiddle.skia.org/c/@measure_text_bounds

On Thu, Sep 8, 2016 at 8:58 AM, 'Brian Salomon' via skia-discuss <skia-d...@googlegroups.com> wrote:

SkPaint has a measureText() method which returns the width of a text run.

Brian

On Thu, Sep 8, 2016 at 8:30 AM Igor Khromov <khromo...@gmail.com> wrote:

Hi guys!

I want to create custom textField and I need to draw separate char or text on canvas. How to define canvas size before it's creation? For example I need to draw symbol "X" with some typeFace created from .ttf file, how I can calculate bitmap size before create canvas?

And do you know any textField implementations based on Skia? And if (know==YES), where I can find them)?

Thanks a lot in advance :-) !!!

--
You received this message because you are subscribed to the Google Groups "skia-discuss" group.

To unsubscribe from this group and stop receiving emails from it, send an email to skia-discuss+unsubscribe@googlegroups.com.

To post to this group, send email to skia-d...@googlegroups.com.
Visit this group at https://groups.google.com/group/skia-discuss.
For more options, visit https://groups.google.com/d/optout.

--

You received this message because you are subscribed to the Google Groups "skia-discuss" group.

To unsubscribe from this group and stop receiving emails from it, send an email to skia-discuss+unsubscribe@googlegroups.com.

[Igor Khromov]

Thanks!

One more question: how can I draw symbols separately, but aligned vertically like they all in one row?

sample image attached.

In the end I need to draw symbols in one row, so they show be aligned correctly. Do I need to create canvas with height font size? And how to align symbol on canvas than?

Thanks!

четверг, 8 сентября 2016 г., 18:10:18 UTC+3 пользователь Hal Canary написал:

for example: https://fiddle.skia.org/c/@measure_text_bounds

On Thu, Sep 8, 2016 at 8:58 AM, 'Brian Salomon' via skia-discuss <skia-d...@googlegroups.com> wrote:

SkPaint has a measureText() method which returns the width of a text run.

Brian

On Thu, Sep 8, 2016 at 8:30 AM Igor Khromov <khromo...@gmail.com> wrote:

Hi guys!

I want to create custom textField and I need to draw separate char or text on canvas. How to define canvas size before it's creation? For example I need to draw symbol "X" with some typeFace created from .ttf file, how I can calculate bitmap size before create canvas?

And do you know any textField implementations based on Skia? And if (know==YES), where I can find them)?

Thanks a lot in advance :-) !!!

--
You received this message because you are subscribed to the Google Groups "skia-discuss" group.

To unsubscribe from this group and stop receiving emails from it, send an email to skia-discuss...@googlegroups.com.

To post to this group, send email to skia-d...@googlegroups.com.
Visit this group at https://groups.google.com/group/skia-discuss.
For more options, visit https://groups.google.com/d/optout.

--
You received this message because you are subscribed to the Google Groups "skia-discuss" group.

To unsubscribe from this group and stop receiving emails from it, send an email to skia-discuss...@googlegroups.com.

[Igor Khromov]

Thanks, I think I got it.

All the bounds connected to baseline, so to get symbol drawn without clipping, I should create canvas with size: height = (fAscent + fDescent ), width = textBounds.width().

четверг, 8 сентября 2016 г., 18:52:01 UTC+3 пользователь Igor Khromov написал:

[bungeman]

On Saturday, September 10, 2016 at 8:38:07 AM UTC-4, Igor Khromov wrote:

Thanks, I think I got it.

All the bounds connected to baseline, so to get symbol drawn without clipping, I should create canvas with size: height = (fAscent + fDescent ), width = textBounds.width().

Any reason not to just use height = textBounds.height() and draw the text at offset textBounds.y() ? Note that the ascent and descent are typographic measures having to do with layout; the glyphs are not required to fit within the typographic ascent to descent.