Re: [racket-users] HtDP/2e, HtDP/3e

[Matthias Felleisen]

:-) 


> On Jan 20, 2018, at 10:10 PM, Neil Van Dyke  wrote:
> 
> Knuth established a standard in CS, of quality-focused pacing, and 
> exceedingly useful tangents.
> 
> Let's see... PLT has made its own language, computer (VM) architecture, and 
> typesetting system... Matthew Butterick has covered fonts...  work proceeding 
> on new editions... :)
> 

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Re: [racket-users] HtDP/2e, HtDP/3e

[Neil Van Dyke]

Knuth established a standard in CS, of quality-focused pacing, and 
exceedingly useful tangents.


Let's see... PLT has made its own language, computer (VM) architecture, 
and typesetting system... Matthew Butterick has covered fonts...  work 
proceeding on new editions... :)


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Re: [racket-users] HtDP/2e, HtDP/3e

[Matthias Felleisen]

> On Jan 20, 2018, at 10:04 AM, Luis Sanjuán  wrote:
> 
> This is great news! I'm wondering whether there is more on the way apart from 
> HtDP/3e? 


Yes, eventually I will write HtDComponents and HtDSystems, pedagogic books 
on the respective topics, but at the rate I am going, they will be the first 
books send
over from the other side :) — Matthias


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[racket-users] HtDP/2e, HtDP/3e

[Luis Sanjuán]

This is great news! I'm wondering whether there is more on the way apart from 
HtDP/3e? 

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[racket-users] Re: Converting mouse event coordinates to coordinates in canvas dc

[Pan Daimonium]

Sorry, please disregard this. The coordinates are already correct, it was a 
totally unrelated bug that was causing the issue.

On Saturday, 20 January 2018 04:01:12 UTC-5, Pan Daimonium wrote:
>
> Hi,
>
> I am trying to make a narrow-purpose graphical editor by subclassing 
> canvas%. I'm reading mouse events to get coordinates, but they're 
> coordinates on screen, and when I try to draw the results to the canvas' 
> dc, they appear in the wrong place. I'm wondering what is the best way to 
> convert coordinates so that the results will show up under the cursor? I 
> saw a similar question asked previously about an editor-canvas%, but the 
> answer given was to use editor-canvas%' global-to-local function, and that 
> class is unsuitable to my purposes.
>
> Thanks,
> Paul
>

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[racket-users] Converting mouse event coordinates to coordinates in canvas dc

[Pan Daimonium]

Hi,

I am trying to make a narrow-purpose graphical editor by subclassing 
canvas%. I'm reading mouse events to get coordinates, but they're 
coordinates on screen, and when I try to draw the results to the canvas' 
dc, they appear in the wrong place. I'm wondering what is the best way to 
convert coordinates so that the results will show up under the cursor? I 
saw a similar question asked previously about an editor-canvas%, but the 
answer given was to use editor-canvas%' global-to-local function, and that 
class is unsuitable to my purposes.

Thanks,
Paul

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