Custom Query (25 matches)

This program leaks 25k/sec

module Main (
    main
)
where

import Graphics.Gloss
import Graphics.Gloss.Interface.IO.Game

main = 
    playIO (InWindow "glossmem" (500, 500) (0,0)) white 10 0
    (\world -> return (translate (-250) 0 (text $ show world)))
    (\event -> (\world -> return world))
    (\timePassed -> (\world -> return $ world + timePassed))

With this program:

import Graphics.Gloss
main    
= animate (InWindow "Foo" (800,800) (0,0)) black 
$ \t -> pictures 
       [ color white $ ThickArc (5 * t+ 0.01) (10 * t+ 0.1) 200 100
       , color red   $ ThickArc (5 * t+ 0.01) (10 * t+ 0.1) 250 10
       , color red   $ ThickArc (5 * t+ 0.01) (10 * t+ 0.1) 150 10 ]

The arc ends aren't at the right angle, depending on the value for the total arc length. I expect this is an interaction between the number of draw steps and the total length.

I propose we generalize the animate, simulate, and play actions by providing variants allowing IO actions for world stepping and rendering.

The reasoning here is: 1) World-stepping should be permitted to be IO because there might be outside influences on the world state (ex: a networked game). 2) Rendering the world should be permitted to be IO because there might be outside information needed (texture loading, map tile retrieving, etc).

This would be particularly useful for work like gloss-osm, that allows immediate rendering by presenting missing tiles with a default until the download is complete.