Episode 27: Easing and Tweening
author |
Steve Losh <steve@stevelosh.com> |
date |
Sun, 29 May 2016 11:47:47 +0000 |
parents |
281946a21897 |
children |
0e40a0899f0f |
(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 :up) (title "Coding Math 2D")
(mouse (make-vec 0 0))
;; Data
(p (make-particle 0.0 (random height) :radius 10))
(target (make-vec width (random height)))
(ease 0.1)
;; Pens
(particle-pen (make-pen :fill (gray 0.9) :stroke (gray 0.4)))
(line-pen (make-pen :curve-steps 100
:stroke (gray 0.7)))
)
(with-setup
;;
(in-context
(draw-axes *width* *height*)
(let* ((distance (vec-sub target (particle-pos p)))
(velocity (vec-mul distance ease)))
(setf (particle-vel p) velocity)
(particle-update! p)
(with-pen particle-pen
(draw-particle p)))
)
;;
)
)
;;;; Mouse
(defun mousemove (instance x y)
(with-slots (target mouse) instance
(setf mouse (make-vec x (- *height* y)))
;;
(setf target mouse)
;;
)
)
(defun mousedown-left (instance x y)
(declare (ignorable instance x y))
)
(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))