blob: 62b6a02c89f9852265932737ca4b7735eb0aa4db (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
|
(define-module (turbo vehicles)
#:use-module (srfi srfi-9)
#:use-module (chickadee math vector)
#:use-module (chickadee math rect)
#:export (make-vehicle
make-inactive-vehicle
vehicle-height
vehicle-length
vehicle-steering-speed
vehicle-id
vehicle-sprite
vehicle-position
vehicle-speed
vehicle-active?
set-vehicle-position!
set-vehicle-speed!
set-vehicle-active!
vehicle-hitbox
vehicle-safety-distance?
vehicle-speed-diff))
(define vehicle-height 45)
(define vehicle-length 100)
(define vehicle-steering-speed 4.0)
(define-record-type <vehicle>
(make-vehicle id sprite position speed active?)
vechicle?
(id vehicle-id)
(sprite vehicle-sprite)
(position vehicle-position set-vehicle-position!)
(speed vehicle-speed set-vehicle-speed!)
(active? vehicle-active? set-vehicle-active!))
(define (make-inactive-vehicle id tile initial-position)
(make-vehicle id tile initial-position 4 #f))
(define (vehicle-hitbox vehicle)
(rect (vec2-x (vehicle-position vehicle))
(vec2-y (vehicle-position vehicle))
vehicle-length
vehicle-height))
(define (vehicle-safety-distance? vehicle1 vehicle2)
(let ((vehicle1-x (vec2-x (vehicle-position vehicle1)))
(vehicle2-x (vec2-x (vehicle-position vehicle2))))
(> vehicle2-x
(+ (* 3 vehicle-length)
vehicle1-x))))
(define (vehicle-speed-diff vehicle1 vehicle2)
(abs (- (vehicle-speed vehicle1) (vehicle-speed vehicle2))))
|
