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;;;; examples/13-canvas-drawing-language.lisp
(defpackage #:ww.examples/12
(:use #:cl)
(:export #:start))
(in-package :ww.examples/12)
(defclass canvas-lang-demo (ww:application) ())
(ww:defhandler quit
(ww::on-keydown (app scancode)
(when (eql :scancode-q scancode)
(ww::stop))))
(ww:defhandler clear-and-draw
(ww::on-perframe (canvas time)
(ww::clear-canvas canvas :r 255 :g 255 :b 255)
(draw-stuff canvas time)
(ww::blit canvas)))
(defun triangle-at (x y)
(ww::move-to x y)
(ww::stroke-rel 150 0)
(ww::stroke-rel 0 130)
(ww::stroke-rel -150 -130))
(defun filled-triangle-at (x y)
(ww::move-to x y)
(ww::fill-rel-path
'((100 100)
(100 -100))))
(defun lower-the-bluer (x y)
(list (* 256 (/ x 500))
(* 256 (/ y 500))
255
255))
(defun plaid1 (x y)
(list (mod (* x x) 256)
(mod (* y y) 256)
(mod (* x y) 256)
255))
(defun draw-stuff (canvas time)
(declare (ignorable time))
(ww::with-canvas canvas
(triangle-at 100 100)
(ww::canvas-pen-color-function #'plaid1)
(filled-triangle-at 250 200)
(ww::canvas-pen-color-function #'lower-the-bluer)
(ww::canvas-pen-width 2)
(ww::stroke-bezier
'((0 0) (200 120) (50 350) (200 100) (300 400))
1000)))
(defmethod ww:boot ((app canvas-lang-demo ))
(let ((canvas
(make-instance 'ww:canvas
:pixel-width 500
:pixel-height 500)))
;; stretch canvas over the whole app
(setf (ww:width canvas) (ww::application-width app)
(ww:height canvas) (ww::application-height app))
;; add it to the display tree
(ww:add-unit app canvas)
;; handlers
(ww:add-handler canvas #'clear-and-draw)
(ww:add-handler app #'quit)
(ww:add-handler canvas #'quit)))
(defun start (&optional (side 500))
(ww::start
(make-instance
'canvas-lang-demo
:fps 10
:width side
:height side
:title "Canvas demo")))
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