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;;;; examples/11-canvas-geometry.lisp
(defpackage #:ww.examples/11
(:use #:cl)
(:export #:start))
(in-package :ww.examples/11)
(defclass geo-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)
(draw-stuff canvas time)
(ww::blit canvas)))
(defun draw-stuff (canvas &optional time)
;; draw a circle
(ww::with-grid-circle (x y) (350 100 90 :interiorp t)
(ww::with-pixel (r g b a) (ww::pixel canvas x y)
(setf r (mod (* 3 x y time) 256)
g (mod x 256)
b (mod y 256))))
;; draw a bunch of circles
(loop
for cx from 0 to 50
for cy from 0 to 50 do
(ww::with-grid-circle (x y) ((+ 300 cx) (+ 300 cy) 80)
(ww::with-pixel (r g b a) (ww::pixel canvas x y)
(setf r (mod (* x y) 256)
g (mod time 256)
b (mod (* y x) 256)))))
;; draw a random thing
(let ((path
(loop repeat 7
collect (list (+ 10 (random 240))
(+ 10 (random 240))))))
(ww::with-grid-path (x y) (path :autoclosep t :interiorp t)
(ww::with-pixel (r g b a) (ww::pixel canvas x y)
(setf r (mod (* 2 y) 256)
g (mod (* 3 x) 256)
b (mod (* x y) 256)))))
(let ((control-points
`((100 250)
(,(+ (mod time 20) -10 -100) 490)
(,(+ (mod time 20) -10 300) 490)
(100 250)))
(path nil))
;; collect the points along the curve
(ww::with-grid-bezier (x y) (control-points :count 16)
(push (list x y) path))
;; and then treat them as a closed path, which is filled.
(ww::with-grid-path (x y) (path :interiorp t)
(ww::with-pixel (r g b a) (ww::pixel canvas x y)
(setf r 200 b 120 g 30)))))
(defmethod ww:boot ((app geo-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 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
'geo-demo
:fps 10
:width side
:height side
:title "Pixels Geometry")))
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