Episode 29: Tweening Part 1
author |
Steve Losh <steve@stevelosh.com> |
date |
Tue, 28 Jun 2016 21:45:49 +0000 |
parents |
0e40a0899f0f |
children |
783609c42ef0 |
(in-package #:coding-math.2d.demo)
;;;; Config
(defparameter *width* 600)
(defparameter *height* 400)
(defparameter *center-x* (/ *width* 2))
(defparameter *center-y* (/ *height* 2))
(defvar *shift* nil)
(defvar *control* nil)
(defvar *command* nil)
(defvar *option* nil)
;;;; Utils
(defmacro with-setup (&body body)
`(with-fps
(background (gray 1))
,@body))
;;;; Sketch
(defun draw-particle (p)
(circle (particle-x p) (particle-y p) (particle-radius p)))
(defun draw-line (p1 p2)
(with-vecs ((x1 y1) p1 (x2 y2) p2)
(line x1 y1 x2 y2)))
(defun draw-circle (p &optional (radius 5))
(if (listp p)
(circle (getf p :x) (getf p :y) (or (getf p :radius) radius))
(circle (vec-x p) (vec-y p) radius)))
(defun draw-square (p radius)
(rect (- (vec-x p) radius)
(- (vec-y p) radius)
(* 2 radius)
(* 2 radius)))
(defun draw-point (p)
(point (vec-x p) (vec-y p)))
(defun oob-p (p &optional (r 0.0))
(or (outsidep (- 0 r) (+ *width* r) (vec-x p))
(outsidep (- 0 r) (+ *height* r) (vec-y p))))
(defsketch cm
((width *width*) (height *height*) (y-axis :down) (title "Coding Math 2D")
(mouse (make-vec 0 0))
;; Data
(start (make-vec 100 100))
(current start)
(target nil)
(amount nil)
(ease-time 0.0)
(duration 2.0)
(timestamp nil)
;; Pens
(particle-pen (make-pen :fill (gray 0.9) :stroke (gray 0.4)))
(line-pen (make-pen :curve-steps 40 :stroke (gray 0.7)))
)
(with-setup
;;
(in-context
(draw-axes *width* *height*)
(with-elapsed (timestamp elapsed)
(when ease-time
(incf ease-time elapsed)))
(when target
(with-vecs ((sx sy) start
(ax ay) amount)
(setf current
(make-vec (tween-quadratic-out sx ax duration ease-time)
(tween-quadratic-out sy ay duration ease-time)))))
(when (> ease-time duration)
(setf target nil
amount nil
ease-time 0.0))
(with-pen particle-pen
(draw-circle current)))
;;
)
)
;;;; Mouse
(defun mousemove (instance x y)
(with-slots (mouse) instance
(setf mouse (make-vec x (- *height* y)))
;;
;;
)
)
(defun mousedown-left (instance x y)
(declare (ignorable instance x y))
(setf-slots instance
start current
current start
target (make-vec x y)
amount (vec-sub target start)
ease-time 0.0))
(defun mousedown-right (instance x y)
(declare (ignorable instance x y))
)
(defun mouseup-left (instance x y)
(declare (ignorable instance x y))
)
(defun mouseup-right (instance x y)
(declare (ignorable instance x y))
)
(defmethod kit.sdl2:mousemotion-event ((window cm) ts b x y xrel yrel)
(declare (ignore ts b xrel yrel))
(mousemove window x y))
(defmethod kit.sdl2:mousebutton-event ((window cm) state ts button x y)
(declare (ignore ts))
(funcall (case state
(:mousebuttondown
(case button
(1 #'mousedown-left)
(3 #'mousedown-right)))
(:mousebuttonup
(case button
(1 #'mouseup-left)
(3 #'mouseup-right))))
window x y))
;;;; Keyboard
(defun keydown (instance scancode)
(declare (ignorable instance))
(scancode-case scancode
(:scancode-space (sketch::prepare instance))
(:scancode-lshift (setf *shift* t))
(:scancode-lctrl (setf *control* t))
(:scancode-lgui (setf *command* t))
(:scancode-lalt (setf *option* t))
;;
;;
))
(defun keyup (instance scancode)
(declare (ignorable instance))
(scancode-case scancode
(:scancode-lshift (setf *shift* nil))
(:scancode-lctrl (setf *control* nil))
(:scancode-lgui (setf *command* nil))
(:scancode-lalt (setf *option* nil))
(:scancode-space nil)))
(defmethod kit.sdl2:keyboard-event ((instance cm) state timestamp repeatp keysym)
(declare (ignore timestamp repeatp))
(cond
((eql state :keyup) (keyup instance (sdl2:scancode-value keysym)))
((eql state :keydown) (keydown instance (sdl2:scancode-value keysym)))
(t nil)))
;;;; Run
; (defparameter *demo* (make-instance 'cm))