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Gmane
From: Jeff Heard <jefferson.r.heard <at> gmail.com>
Subject: ANN: Thingie-0.80
Newsgroups: gmane.comp.lang.haskell.cafe
Date: Thursday 18th December 2008 22:12:18 UTC (over 8 years ago)
I need a better name for this, but I have software, so I shall release
it with a dumb name.  Thingie has just been uploaded to hackage.  It
is a library for creating 2D visualizations in a purely functional
manner.  It supports static visualizations and animation, and like
most vis libraries, can probably do games as well as simple viz
graphics.  The backend uses Cairo for rendering, but I'm looking to
port it to OpenGL/GLUT for systems where Gtk/Cairo is hard to get
working (i.e. OS/X).  The idea is that you create a graph of objects
or function that return objects and the library renders them for you
in 2D.

Right now, there's one thing I would like to add to the system above
all other things:  The interactive system has the concept of a tracked
program state that is threaded through the graph.  This state is
defined by a UIState class, and any state (which is a record object)
must be an instance of UIState and provide the system with a certain
number of getters and setters for basic bits of state.  I would like
to use Template Haskell to help create/derive these structures.  Does
anyone on the list want to help with that?

Here are two examples.  Each draws a smiley face, and the interactive
one tracks your mouse with a little red ball.
First the non-interactive:

module Main where

import Graphics.Rendering.Thingie.Primitives
import Graphics.Rendering.Thingie.Cairo
import qualified Graphics.Rendering.Cairo as Cairo

smiley = Context [FillRGBA 0 0 0 0, Operator Cairo.OperatorClear] $
                 Group [Draw rectangleFilled{ topleft=Point2D 0 0,
width=200, height=200 }
                       ,Context [FillRGBA 1 1 0 1, OutlineRGBA 0 0 0
1, Translate 100 100, Operator Cairo.OperatorOver] $
                                Group [Draw arc{ radius=100, filled=True }
                                      ,Context [FillRGBA 0 0 0 1] $
                                               Group [Draw arc{
center=Point2D (-33) (-33), radius=10, filled=True }
                                                     ,Draw arc{
center=Point2D   33  (-33), radius=10, filled=True }
                                                     ,Draw arc{
angle1=degrees 30, angle2=degrees 150, radius=70 }]]]

main = renderObjectToPNG "smiley.png" 200 200 smiley


-----

Now the interactive:


import Graphics.Rendering.Thingie.Interactive
import Graphics.Rendering.Thingie.BasicUIState
import Graphics.Rendering.Thingie.Cairo
import Graphics.Rendering.Thingie.Primitives

import qualified Graphics.Rendering.Cairo as Cairo

smiley = Context [FillRGBA 0 0 0 0, Operator Cairo.OperatorClear] $
                 Group [Draw rectangleFilled{ topleft=Point2D 0 0,
width=200, height=200 }
                       ,Context [FillRGBA 1 1 0 1, OutlineRGBA 0 0 0
1, Translate 100 100, Operator Cairo.OperatorOver] $
                                Group [Draw arc{ radius=100, filled=True }
                                      ,Context [FillRGBA 0 0 0 1] $
                                               Group [Draw arc{
center=Point2D (-33) (-33), radius=10, filled=True }
                                                     ,Draw arc{
center=Point2D   33  (-33), radius=10, filled=True }
                                                     ,Draw arc{
angle1=degrees 30, angle2=degrees 150, radius=70 }]]]

undercursor uistate = Context [FillRGBA 1 0 0 1] $
                              Draw arcFilled{ center=mousePosition
uistate, radius=5 }

scene = [StaticElement smiley (Rect2D 0 0 0 0)
        ,UnboundedElement undercursor]

main = simpleMotionSensitiveGui defaultBasicUIState scene "smiley face"
 
CD: 3ms