W3C home > Mailing lists > Public > whatwg@whatwg.org > October 2006

[whatwg] Canvas lack of drawString method (p.s.)

From: Stefan Haustein <sh@kobjects.org>
Date: Wed, 18 Oct 2006 00:19:09 +0200
Message-ID: <453556DD.10008@kobjects.org>
p.s.: To simplify coping with changing font sizes, it probably makes 
sense to add an "align" parameter (left|center|right 
top|center|baseline|bottom) to the drawString call...

Stefan Haustein wrote:
> Hi,
>
> I would like to second the drawString() request.
>
> It makes sense to have a simple API, but it should be balanced with 
> application simplicity and readability to some extent. Doing CSS black 
> magic to overlay text and a Canvas object just seems inadequate for 
> something like axis labeling.
>
> As noted earlier by somebody else (did not find the mail...), we would 
> also need a simple Font object, but the minimum requirements seem 
> rather simple:
>
> Font Canvas.createFont(String cssFontProperties);
> Canvas.setFont(Font font) // set current font
> Canvas.drawString(int x, int y, String text);
> Font Canvas.getFont() // current font
>
> int Font.stringWidth(String s);
> int Font.getHeight();  // includes leading
> int Font.getBaselinePosition();
> int Font.getAscent();
> int Font.getDescent();
>
> Best regards
> Stefan Haustein
>
>
>
> Alfonso Baqueiro wrote:
>> Hello Charles,
>>
>> 2006/10/17, Charles Iliya Krempeaux <supercanadian at gmail.com 
>> <mailto:supercanadian at gmail.com>>:
>>
>>     Hello Alfonso,
>>
>>     On 10/17/06, *Alfonso Baqueiro* < abaqueiro at gmail.com
>>     <mailto:abaqueiro at gmail.com>> wrote:
>>
>>         The canvas component is very promising, but the lack of
>>         drawString method could be a great error for its success, this
>>         lack is a huge limitation, how could you resolve this problem?
>>
>>
>>     I believe that some people's reason for not wanting to add it was
>>     because of Accessibility concerns.
>>
>>     Although normal text in a webpage... or even a text image (with
>>     the "alt" attribute filled in properly) could be "read" by a
>>     person with disabilities, text embedded in the canvas element
>>     could not.
>>
>>     Perhaps people need to think about how to add Accessibility to the
>>     canvas while allowing a "drawString" procedure.
>>
>>
>> Well a drawString method in canvas can be used for drawing the axis 
>> labels or values on a dinamic javascript graphic, but is non sense an 
>> aural reader read it, theres no way (yet) to read an image to a 
>> blinded people, there are cases where is imposible the accessibility, 
>> is imposible for a blind to play video games, and accessibility dont 
>> stop the video games creation. In the case of images or the canvas 
>> the alt attribute could do the job.
>>
>>     See ya
>>
>
Received on Tuesday, 17 October 2006 15:19:09 UTC

This archive was generated by hypermail 2.4.0 : Wednesday, 22 January 2020 16:58:48 UTC