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Offline Ashish

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Car : Physics Test
« on: July 15, 2017, 08:39:25 am »
Hi Everyone! :)
Here's is simple demo of Car running on a uneven road with real-time physics
in the background giving at natural effect.

Controls -
'a' & 'd' to move left & right
Space to apply brakes
'h' to toggle on/off headlights


**Code is updated to according to suggestions**

Code: QB64: [Select]
  1. '####################
  2. ' Cars By Ashish
  3. '####################
  4. ' Just for fun! :)
  5. '@KingOfCoders
  6.  
  7. _TITLE "Cars"
  8.  
  9. TYPE vec2
  10.     x AS SINGLE
  11.     y AS SINGLE
  13.  
  14. TYPE wheels
  15.     pos AS vec2 'position
  16.     vel AS vec2 'velocity
  17.     acc AS vec2 'acceleration
  18.     ang AS _FLOAT 'angle
  19.     radius AS SINGLE 'wheel radius
  20.     pos2 AS vec2
  22.  
  23. TYPE headlights
  24.     pos AS vec2
  25.     switched AS _BYTE
  26.     'power as single
  28.  
  29. TYPE bodyFrames
  30.     baseFrame AS vec2
  31.     steepFrame AS vec2
  32.     baseFrame2 AS vec2
  33.     steepFrame2 AS vec2
  35.  
  36. TYPE cars
  37.     backWheel AS wheels
  38.     frontWheel AS wheels
  39.     headlight AS headlights
  40.     body AS bodyFrames
  42.  
  44.  
  45. SCREEN _NEWIMAGE(800, 400, 32)
  46.  
  47. 'noise function related variables
  48. DIM SHARED perlin_octaves AS SINGLE, perlin_amp_falloff AS SINGLE
  49.  
  50. DIM SHARED Car AS cars, white&, roadMap(800) AS vec2
  51.  
  52. FOR i = 0 TO 800
  53.     roadMap(i).x = i
  54.     roadMap(i).y = noise(xoff, yoff, 0) * 40 + 363
  55.     xoff = xoff + .001
  56.     yoff = yoff + .01
  58.  
  59. white& = _RGB(255, 255, 255)
  60. v = RND
  61. Car.backWheel.pos.x = 50
  62. Car.backWheel.pos.y = 350
  63. Car.backWheel.ang = v
  64. Car.backWheel.radius = 13
  65.  
  66. Car.frontWheel.pos.x = 130
  67. Car.frontWheel.pos.y = 350
  68. Car.frontWheel.ang = v
  69. Car.frontWheel.radius = 13
  70.  
  71. Car.headlight.switched = -1
  72.  
  73. initCar Car
  74.  
  75.  
  77.     drawCar Car
  78.     drawMap roadMap()
  79.     IF _KEYDOWN(ASC("d")) THEN
  80.         Car.backWheel.acc.x = Car.backWheel.acc.x + .05
  81.         Car.frontWheel.acc.x = Car.frontWheel.acc.x + .05
  82.     END IF
  83.     IF _KEYDOWN(ASC("a")) THEN
  84.         Car.backWheel.acc.x = Car.backWheel.acc.x - .05
  85.         Car.frontWheel.acc.x = Car.frontWheel.acc.x - .05
  86.     END IF
  87.     IF _KEYDOWN(ASC(" ")) THEN
  88.         IF Car.backWheel.vel.x > 0 THEN Car.backWheel.vel.x = Car.backWheel.vel.x - .09
  89.         IF Car.backWheel.vel.x < 0 THEN Car.backWheel.vel.x = Car.backWheel.vel.x + .09
  90.  
  91.         IF Car.frontWheel.vel.x > 0 THEN Car.frontWheel.vel.x = Car.frontWheel.vel.x - .09
  92.         IF Car.frontWheel.vel.x < 0 THEN Car.frontWheel.vel.x = Car.frontWheel.vel.x + .09
  93.     END IF
  94.     IF _KEYHIT = (ASC("h")) THEN
  95.         IF Car.headlight.switched THEN Car.headlight.switched = 0 ELSE Car.headlight.switched = -1
  96.     END IF
  97.     updateCar Car
  98.     _LIMIT 40
  99.     _DISPLAY
  100.     CLS , 1
  101.     Car.backWheel.acc.x = 0
  102.     Car.frontWheel.acc.x = 0
  103.        
  104.     IF Car.frontWheel.pos.x > 0 AND Car.frontWheel.pos.x < 800 AND Car.backWheel.pos.x > 0 AND Car.backWheel.pos.x < 800 THEN
  105.         Car.frontWheel.pos.x = roadMap(Car.frontWheel.pos2.x).x
  106.         Car.frontWheel.pos.y = roadMap(Car.frontWheel.pos2.x).y - 13
  107.         Car.backWheel.pos.x = roadMap(Car.backWheel.pos2.x).x
  108.         Car.backWheel.pos.y = roadMap(Car.backWheel.pos2.x).y - 13
  109.     END IF
  111.  
  112. SUB drawMap (mapData() AS vec2)
  113. FOR i = 0 TO UBOUND(mapData) - 1
  114.     LINE (mapData(i).x, mapData(i).y)-(mapData(i + 1).x, mapData(i + 1).y), white&
  117.  
  118. SUB initCar (obj AS cars)
  119. obj.headlight.pos.x = obj.frontWheel.pos.x + 25
  120. obj.headlight.pos.y = obj.frontWheel.pos.y - 25
  122.  
  123. SUB drawCar (obj AS cars)
  124. 'we will draw body frames first, then, lights, followed by wheels.
  125.  
  126. LINE (obj.backWheel.pos.x - 30, obj.backWheel.pos.y - 40)-(obj.frontWheel.pos.x + 25, obj.frontWheel.pos.y - 40), white& 'up base
  127. LINE (obj.backWheel.pos.x + obj.backWheel.radius, obj.backWheel.pos.y)-(obj.frontWheel.pos.x - obj.frontWheel.radius, obj.frontWheel.pos.y), white& 'down base
  128.  
  129. '.....and some more..... little lines to cover down base.....
  130. LINE (obj.backWheel.pos.x - obj.backWheel.radius, obj.backWheel.pos.y)-(obj.backWheel.pos.x - 30, obj.backWheel.pos.y), white&
  131. LINE (obj.frontWheel.pos.x + obj.backWheel.radius, obj.frontWheel.pos.y)-(obj.frontWheel.pos.x + 25, obj.frontWheel.pos.y), white&
  132.  
  133. 'left & right of base
  134. LINE (obj.backWheel.pos.x - 30, obj.backWheel.pos.y)-(obj.backWheel.pos.x - 30, obj.backWheel.pos.y - 40), white&
  135. LINE (obj.frontWheel.pos.x + 25, obj.frontWheel.pos.y)-(obj.frontWheel.pos.x + 25, obj.frontWheel.pos.y - 40), white&
  136.  
  137. 'steeps
  138.  
  139. LINE (obj.backWheel.pos.x - 30, obj.backWheel.pos.y - 40)-(obj.backWheel.pos.x + 5, obj.backWheel.pos.y - 70), white&
  140. LINE (obj.frontWheel.pos.x + 25, obj.frontWheel.pos.y - 40)-(obj.frontWheel.pos.x - 5, obj.frontWheel.pos.y - 70), white&
  141.  
  142. 'roof
  143. LINE (obj.backWheel.pos.x + 5, obj.backWheel.pos.y - 70)-(obj.frontWheel.pos.x - 5, obj.frontWheel.pos.y - 70), white&
  144.  
  145. 'divider, to form window glasses
  146. 'line (obj.backWheel.pos.y - 70)-(obj.)
  147.  
  148. 'lights, x = cos0*r + xx, cos0 = x - xx / r
  149. IF obj.headlight.switched THEN
  150.     FOR i = 1 TO 150
  151.         h = map(i, 1, 150, 3, 30)
  152.         a = map(i, 1, 100, 200, 0)
  153.         LINE (obj.headlight.pos.x + i, obj.headlight.pos.y - h)-(obj.headlight.pos.x + i, obj.headlight.pos.y + h), _RGBA(255, 255, 255, a)
  154.     NEXT
  156. 'tyres
  157. CIRCLE (obj.backWheel.pos.x, obj.backWheel.pos.y), obj.backWheel.radius, white&
  158. CIRCLE (obj.frontWheel.pos.x, obj.frontWheel.pos.y), obj.frontWheel.radius, white&
  159.  
  160. LINE (COS(obj.backWheel.ang) * obj.backWheel.radius + obj.backWheel.pos.x, SIN(obj.backWheel.ang) * obj.backWheel.radius + obj.backWheel.pos.y)-(COS(obj.backWheel.ang + _PI) * obj.backWheel.radius + obj.backWheel.pos.x, SIN(obj.backWheel.ang + _PI) * obj.backWheel.radius + obj.backWheel.pos.y), white&
  161. LINE (COS(obj.frontWheel.ang) * obj.frontWheel.radius + obj.frontWheel.pos.x, SIN(obj.frontWheel.ang) * obj.frontWheel.radius + obj.frontWheel.pos.y)-(COS(obj.frontWheel.ang + _PI) * obj.frontWheel.radius + obj.frontWheel.pos.x, SIN(obj.frontWheel.ang + _PI) * obj.frontWheel.radius + obj.frontWheel.pos.y), white&
  162.  
  164.  
  165.  
  166. SUB updateCar (obj AS cars)
  167. obj.backWheel.pos.x = obj.backWheel.pos.x + obj.backWheel.vel.x
  168. obj.backWheel.pos.y = obj.backWheel.pos.y + obj.backWheel.vel.y
  169.  
  170. IF obj.backWheel.vel.x > 0 THEN obj.backWheel.vel.x = obj.backWheel.vel.x - .01
  171. IF obj.backWheel.vel.x < 0 THEN obj.backWheel.vel.x = obj.backWheel.vel.x + .01
  172.  
  173. obj.frontWheel.pos.x = obj.frontWheel.pos.x + obj.frontWheel.vel.x
  174. obj.frontWheel.pos.y = obj.frontWheel.pos.y + obj.frontWheel.vel.y
  175.  
  176. IF obj.frontWheel.vel.x > 0 THEN obj.frontWheel.vel.x = obj.frontWheel.vel.x - .01
  177. IF obj.frontWheel.vel.x < 0 THEN obj.frontWheel.vel.x = obj.frontWheel.vel.x + .01
  178.  
  179. obj.backWheel.vel.x = obj.backWheel.vel.x + obj.backWheel.acc.x
  180. obj.backWheel.vel.y = obj.backWheel.vel.y + obj.backWheel.acc.y
  181.  
  182. obj.frontWheel.vel.x = obj.frontWheel.vel.x + obj.frontWheel.acc.x
  183. obj.frontWheel.vel.y = obj.frontWheel.vel.y + obj.frontWheel.acc.y
  184.  
  185. IF ABS(obj.backWheel.vel.x) > 0 THEN
  186.     IF obj.backWheel.vel.x <> 0 THEN obj.backWheel.ang = obj.backWheel.pos.x / obj.backWheel.radius
  188.  
  189. IF ABS(obj.frontWheel.vel.x) > 0 THEN
  190.     IF obj.frontWheel.vel.x <> 0 THEN obj.frontWheel.ang = obj.frontWheel.pos.x / Car.frontWheel.radius
  192. obj.headlight.pos.x = obj.frontWheel.pos.x + 25
  193. obj.headlight.pos.y = obj.frontWheel.pos.y - 25
  194.  
  195. obj.backWheel.pos2.x = INT(obj.backWheel.pos.x)
  196. obj.backWheel.pos2.y = INT(obj.backWheel.pos.y)
  197.  
  198. obj.frontWheel.pos2.x = INT(obj.frontWheel.pos.x)
  199. obj.frontWheel.pos2.y = INT(obj.frontWheel.pos.y)
  201.  
  202. FUNCTION map! (value!, minRange!, maxRange!, newMinRange!, newMaxRange!)
  203. map! = ((value! - minRange!) / (maxRange! - minRange!)) * (newMaxRange! - newMinRange!) + newMinRange!
  205.  
  206. FUNCTION dist! (x1!, y1!, x2!, y2!)
  207. dist! = SQR((x2! - x1!) ^ 2 + (y2! - y1!) ^ 2)
  209.  
  210. FUNCTION noise! (x AS SINGLE, y AS SINGLE, z AS SINGLE)
  211. STATIC p5NoiseSetup AS _BYTE
  212. STATIC perlin() AS SINGLE
  213. STATIC PERLIN_YWRAPB AS SINGLE, PERLIN_YWRAP AS SINGLE
  214. STATIC PERLIN_ZWRAPB AS SINGLE, PERLIN_ZWRAP AS SINGLE
  215. STATIC PERLIN_SIZE AS SINGLE
  216.  
  217. IF NOT p5NoiseSetup THEN
  218.     p5NoiseSetup = -1
  219.  
  220.     PERLIN_YWRAPB = 4
  221.     PERLIN_YWRAP = INT(1 * (2 ^ PERLIN_YWRAPB))
  222.     PERLIN_ZWRAPB = 8
  223.     PERLIN_ZWRAP = INT(1 * (2 ^ PERLIN_ZWRAPB))
  224.     PERLIN_SIZE = 4095
  225.  
  226.     perlin_octaves = 4
  227.     perlin_amp_falloff = 0.5
  228.  
  229.     REDIM perlin(PERLIN_SIZE + 1) AS SINGLE
  230.     DIM i AS SINGLE
  231.     FOR i = 0 TO PERLIN_SIZE + 1
  232.         perlin(i) = RND
  233.     NEXT
  235.  
  236. x = ABS(x)
  237. y = ABS(y)
  238. z = ABS(z)
  239.  
  241. xi = INT(x)
  242. yi = INT(y)
  243. zi = INT(z)
  244.  
  246. xf = x - xi
  247. yf = y - yi
  248. zf = z - zi
  249.  
  251. r = 0
  252. ampl = .5
  253.  
  254. FOR o = 1 TO perlin_octaves
  255.     DIM of AS SINGLE, rxf AS SINGLE
  256.     DIM ryf AS SINGLE, n1 AS SINGLE, n2 AS SINGLE, n3 AS SINGLE
  257.     of = xi + INT(yi * (2 ^ PERLIN_YWRAPB)) + INT(zi * (2 ^ PERLIN_ZWRAPB))
  258.  
  259.     rxf = 0.5 * (1.0 - COS(xf * _PI))
  260.     ryf = 0.5 * (1.0 - COS(yf * _PI))
  261.  
  262.     n1 = perlin(of AND PERLIN_SIZE)
  263.     n1 = n1 + rxf * (perlin((of + 1) AND PERLIN_SIZE) - n1)
  264.     n2 = perlin((of + PERLIN_YWRAP) AND PERLIN_SIZE)
  265.     n2 = n2 + rxf * (perlin((of + PERLIN_YWRAP + 1) AND PERLIN_SIZE) - n2)
  266.     n1 = n1 + ryf * (n2 - n1)
  267.  
  268.     of = of + PERLIN_ZWRAP
  269.     n2 = perlin(of AND PERLIN_SIZE)
  270.     n2 = n2 + rxf * (perlin((of + 1) AND PERLIN_SIZE) - n2)
  271.     n3 = perlin((of + PERLIN_YWRAP) AND PERLIN_SIZE)
  272.     n3 = n3 + rxf * (perlin((of + PERLIN_YWRAP + 1) AND PERLIN_SIZE) - n3)
  273.     n2 = n2 + ryf * (n3 - n2)
  274.  
  275.     n1 = n1 + (0.5 * (1.0 - COS(zf * _PI))) * (n2 - n1)
  276.  
  277.     r = r + n1 * ampl
  278.     ampl = ampl * perlin_amp_falloff
  279.     xi = INT(xi * (2 ^ 1))
  280.     xf = xf * 2
  281.     yi = INT(yi * (2 ^ 1))
  282.     yf = yf * 2
  283.     zi = INT(zi * (2 ^ 1))
  284.     zf = zf * 2
  285.  
  286.     IF xf >= 1.0 THEN xi = xi + 1: xf = xf - 1
  287.     IF yf >= 1.0 THEN yi = yi + 1: yf = yf - 1
  288.     IF zf >= 1.0 THEN zi = zi + 1: zf = zf - 1
  290. noise! = r
  292.  
  293. SUB noiseDetail (lod!, falloff!)
  294. IF lod! > 0 THEN perlin_octaves = lod!
  295. IF falloff! > 0 THEN perlin_amp_falloff = falloff!
  297.  

I hope you'll enjoy it.
« Last Edit: July 16, 2017, 12:49:55 am by Ashish »
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Offline STxAxTIC

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Re: Car : Physics Test
« Reply #1 on: July 15, 2017, 11:11:25 am »
Hello Ashish -

I like it. Thanks for posting! I noticed that maaaaybe the wheels have a little slip to them, and at low speeds below .8 they do some funny things. I see why you did that on purpose - no worries.

If (and for the moment, only if) the "noise" of the road is not *too* steep and crazy - kindof like the settings you are demonstrating, I might suggest calculating the rotation angle of each wheel not with velocity, but with position. I modified the code for the front wheel only to demonstrate this - you can see that it doesn't want to slip like that back one does.

To generalize the method for all kinds of curves that go upside down and stuff, that can be done too.

Anyway, compare the front and back wheels:

Code: QB64: [Select]
  1. '####################
  2. ' Cars By Ashish
  3. '####################
  4. ' Just for fun! :)
  5. '@KingOfCoders
  6.  
  7. _TITLE "Cars"
  8.  
  9. TYPE vec2
  10.     x AS SINGLE
  11.     y AS SINGLE
  13.  
  14. TYPE wheels
  15.     pos AS vec2 'position
  16.     vel AS vec2 'velocity
  17.     acc AS vec2 'acceleration
  18.     ang AS _FLOAT 'angle
  19.     radius AS SINGLE 'wheel radius
  20.     pos2 AS vec2
  22.  
  23. TYPE headlights
  24.     pos AS vec2
  25.     switched AS _BYTE
  26.     'power as single
  28.  
  29. TYPE bodyFrames
  30.     baseFrame AS vec2
  31.     steepFrame AS vec2
  32.     baseFrame2 AS vec2
  33.     steepFrame2 AS vec2
  35.  
  36. TYPE cars
  37.     backWheel AS wheels
  38.     frontWheel AS wheels
  39.     headlight AS headlights
  40.     body AS bodyFrames
  42.  
  44.  
  45. SCREEN _NEWIMAGE(800, 400, 32)
  46.  
  47. 'noise function related variables
  48. DIM SHARED perlin_octaves AS SINGLE, perlin_amp_falloff AS SINGLE
  49.  
  50. DIM SHARED Car AS cars, white&, roadMap(800) AS vec2
  51.  
  52. FOR i = 0 TO 800
  53.     roadMap(i).x = i
  54.     roadMap(i).y = noise(xoff, yoff, 0) * 40 + 363
  55.     xoff = xoff + .001
  56.     yoff = yoff + .01
  58.  
  59. white& = _RGB(255, 255, 255)
  60. v = RND
  61. Car.backWheel.pos.x = 50
  62. Car.backWheel.pos.y = 350
  63. Car.backWheel.ang = v
  64. Car.backWheel.radius = 13
  65.  
  66. Car.frontWheel.pos.x = 130
  67. Car.frontWheel.pos.y = 350
  68. Car.frontWheel.ang = v
  69. Car.frontWheel.radius = 13
  70.  
  71. Car.headlight.switched = -1
  72.  
  73. initCar Car
  74.  
  75.  
  77.     drawCar Car
  78.     drawMap roadMap()
  79.     IF _KEYDOWN(ASC("d")) THEN
  80.         Car.backWheel.acc.x = Car.backWheel.acc.x + .05
  81.         Car.frontWheel.acc.x = Car.frontWheel.acc.x + .05
  82.     END IF
  83.     IF _KEYDOWN(ASC("a")) THEN
  84.         Car.backWheel.acc.x = Car.backWheel.acc.x - .05
  85.         Car.frontWheel.acc.x = Car.frontWheel.acc.x - .05
  86.     END IF
  87.     IF _KEYDOWN(ASC(" ")) THEN
  88.         IF Car.backWheel.vel.x > 0 THEN Car.backWheel.vel.x = Car.backWheel.vel.x - .09
  89.         IF Car.backWheel.vel.x < 0 THEN Car.backWheel.vel.x = Car.backWheel.vel.x + .09
  90.  
  91.         IF Car.frontWheel.vel.x > 0 THEN Car.frontWheel.vel.x = Car.frontWheel.vel.x - .09
  92.         IF Car.frontWheel.vel.x < 0 THEN Car.frontWheel.vel.x = Car.frontWheel.vel.x + .09
  93.     END IF
  94.     IF _KEYDOWN(ASC("h")) THEN
  95.         IF Car.headlight.switched THEN Car.headlight.switched = 0 ELSE Car.headlight.switched = -1
  96.     END IF
  97.     updateCar Car
  98.     _LIMIT 40
  99.     _DISPLAY
  100.     CLS , 1
  101.     Car.backWheel.acc.x = 0
  102.     Car.frontWheel.acc.x = 0
  103.  
  104.     IF Car.frontWheel.pos.x < 800 AND Car.backWheel.pos.x > 0 THEN
  105.         Car.backWheel.pos.x = roadMap(Car.backWheel.pos2.x).x
  106.         Car.backWheel.pos.y = roadMap(Car.backWheel.pos2.x).y - 13
  107.  
  108.         Car.frontWheel.pos.x = roadMap(Car.frontWheel.pos2.x).x
  109.         Car.frontWheel.pos.y = roadMap(Car.frontWheel.pos2.x).y - 13
  110.     END IF
  112.  
  113. SUB drawMap (mapData() AS vec2)
  114. FOR i = 0 TO UBOUND(mapData) - 1
  115.     LINE (mapData(i).x, mapData(i).y)-(mapData(i + 1).x, mapData(i + 1).y), white&
  118.  
  119. SUB initCar (obj AS cars)
  120. obj.headlight.pos.x = obj.frontWheel.pos.x + 25
  121. obj.headlight.pos.y = obj.frontWheel.pos.y - 25
  123.  
  124. SUB drawCar (obj AS cars)
  125. 'we will draw body frames first, then, lights, followed by wheels.
  126.  
  127. LINE (obj.backWheel.pos.x - 30, obj.backWheel.pos.y - 40)-(obj.frontWheel.pos.x + 25, obj.frontWheel.pos.y - 40), white& 'up base
  128. LINE (obj.backWheel.pos.x + obj.backWheel.radius, obj.backWheel.pos.y)-(obj.frontWheel.pos.x - obj.frontWheel.radius, obj.frontWheel.pos.y), white& 'down base
  129.  
  130. '.....and some more..... little lines to cover down base.....
  131. LINE (obj.backWheel.pos.x - obj.backWheel.radius, obj.backWheel.pos.y)-(obj.backWheel.pos.x - 30, obj.backWheel.pos.y), white&
  132. LINE (obj.frontWheel.pos.x + obj.backWheel.radius, obj.frontWheel.pos.y)-(obj.frontWheel.pos.x + 25, obj.frontWheel.pos.y), white&
  133.  
  134. 'left & right of base
  135. LINE (obj.backWheel.pos.x - 30, obj.backWheel.pos.y)-(obj.backWheel.pos.x - 30, obj.backWheel.pos.y - 40), white&
  136. LINE (obj.frontWheel.pos.x + 25, obj.frontWheel.pos.y)-(obj.frontWheel.pos.x + 25, obj.frontWheel.pos.y - 40), white&
  137.  
  138. 'steeps
  139.  
  140. LINE (obj.backWheel.pos.x - 30, obj.backWheel.pos.y - 40)-(obj.backWheel.pos.x + 5, obj.backWheel.pos.y - 70), white&
  141. LINE (obj.frontWheel.pos.x + 25, obj.frontWheel.pos.y - 40)-(obj.frontWheel.pos.x - 5, obj.frontWheel.pos.y - 70), white&
  142.  
  143. 'roof
  144. LINE (obj.backWheel.pos.x + 5, obj.backWheel.pos.y - 70)-(obj.frontWheel.pos.x - 5, obj.frontWheel.pos.y - 70), white&
  145.  
  146. 'divider, to form window glasses
  147. 'line (obj.backWheel.pos.y - 70)-(obj.)
  148.  
  149. 'lights, x = cos0*r + xx, cos0 = x - xx / r
  150. IF obj.headlight.switched THEN
  151.     FOR i = 1 TO 150
  152.         h = map(i, 1, 150, 3, 30)
  153.         a = map(i, 1, 100, 200, 0)
  154.         LINE (obj.headlight.pos.x + i, obj.headlight.pos.y - h)-(obj.headlight.pos.x + i, obj.headlight.pos.y + h), _RGBA(255, 255, 255, a)
  155.     NEXT
  157. 'tyres
  158. CIRCLE (obj.backWheel.pos.x, obj.backWheel.pos.y), obj.backWheel.radius, white&
  159. CIRCLE (obj.frontWheel.pos.x, obj.frontWheel.pos.y), obj.frontWheel.radius, white&
  160.  
  161. LINE (COS(obj.backWheel.ang) * obj.backWheel.radius + obj.backWheel.pos.x, SIN(obj.backWheel.ang) * obj.backWheel.radius + obj.backWheel.pos.y)-(COS(obj.backWheel.ang + _PI) * obj.backWheel.radius + obj.backWheel.pos.x, SIN(obj.backWheel.ang + _PI) * obj.backWheel.radius + obj.backWheel.pos.y), white&
  162. LINE (COS(obj.frontWheel.ang) * obj.frontWheel.radius + obj.frontWheel.pos.x, SIN(obj.frontWheel.ang) * obj.frontWheel.radius + obj.frontWheel.pos.y)-(COS(obj.frontWheel.ang + _PI) * obj.frontWheel.radius + obj.frontWheel.pos.x, SIN(obj.frontWheel.ang + _PI) * obj.frontWheel.radius + obj.frontWheel.pos.y), white&
  163.  
  165.  
  166.  
  167. SUB updateCar (obj AS cars)
  168. obj.backWheel.pos.x = obj.backWheel.pos.x + obj.backWheel.vel.x
  169. obj.backWheel.pos.y = obj.backWheel.pos.y + obj.backWheel.vel.y
  170.  
  171. IF obj.backWheel.vel.x > 0 THEN obj.backWheel.vel.x = obj.backWheel.vel.x - .01
  172. IF obj.backWheel.vel.x < 0 THEN obj.backWheel.vel.x = obj.backWheel.vel.x + .01
  173.  
  174. obj.frontWheel.pos.x = obj.frontWheel.pos.x + obj.frontWheel.vel.x
  175. obj.frontWheel.pos.y = obj.frontWheel.pos.y + obj.frontWheel.vel.y
  176.  
  177. IF obj.frontWheel.vel.x > 0 THEN obj.frontWheel.vel.x = obj.frontWheel.vel.x - .01
  178. IF obj.frontWheel.vel.x < 0 THEN obj.frontWheel.vel.x = obj.frontWheel.vel.x + .01
  179.  
  180. obj.backWheel.vel.x = obj.backWheel.vel.x + obj.backWheel.acc.x
  181. obj.backWheel.vel.y = obj.backWheel.vel.y + obj.backWheel.acc.y
  182.  
  183. obj.frontWheel.vel.x = obj.frontWheel.vel.x + obj.frontWheel.acc.x
  184. obj.frontWheel.vel.y = obj.frontWheel.vel.y + obj.frontWheel.acc.y
  185.  
  186. IF ABS(obj.backWheel.vel.x) > .8 THEN
  187.     IF obj.backWheel.vel.x <> 0 THEN obj.backWheel.ang = obj.backWheel.ang + obj.backWheel.vel.x * 0.077
  189.  
  190. IF ABS(obj.frontWheel.vel.x) > 0 THEN
  191.     IF obj.frontWheel.vel.x <> 0 THEN obj.frontWheel.ang = obj.frontWheel.pos.x / Car.frontWheel.radius
  193. obj.headlight.pos.x = obj.frontWheel.pos.x + 25
  194. obj.headlight.pos.y = obj.frontWheel.pos.y - 25
  195.  
  196. obj.backWheel.pos2.x = INT(obj.backWheel.pos.x)
  197. obj.backWheel.pos2.y = INT(obj.backWheel.pos.y)
  198.  
  199. obj.frontWheel.pos2.x = INT(obj.frontWheel.pos.x)
  200. obj.frontWheel.pos2.y = INT(obj.frontWheel.pos.y)
  202.  
  203. FUNCTION map! (value!, minRange!, maxRange!, newMinRange!, newMaxRange!)
  204. map! = ((value! - minRange!) / (maxRange! - minRange!)) * (newMaxRange! - newMinRange!) + newMinRange!
  206.  
  207. FUNCTION dist! (x1!, y1!, x2!, y2!)
  208. dist! = SQR((x2! - x1!) ^ 2 + (y2! - y1!) ^ 2)
  210.  
  211. FUNCTION noise! (x AS SINGLE, y AS SINGLE, z AS SINGLE)
  212. STATIC p5NoiseSetup AS _BYTE
  213. STATIC perlin() AS SINGLE
  214. STATIC PERLIN_YWRAPB AS SINGLE, PERLIN_YWRAP AS SINGLE
  215. STATIC PERLIN_ZWRAPB AS SINGLE, PERLIN_ZWRAP AS SINGLE
  216. STATIC PERLIN_SIZE AS SINGLE
  217.  
  218. IF NOT p5NoiseSetup THEN
  219.     p5NoiseSetup = -1
  220.  
  221.     PERLIN_YWRAPB = 4
  222.     PERLIN_YWRAP = INT(1 * (2 ^ PERLIN_YWRAPB))
  223.     PERLIN_ZWRAPB = 8
  224.     PERLIN_ZWRAP = INT(1 * (2 ^ PERLIN_ZWRAPB))
  225.     PERLIN_SIZE = 4095
  226.  
  227.     perlin_octaves = 4
  228.     perlin_amp_falloff = 0.5
  229.  
  230.     REDIM perlin(PERLIN_SIZE + 1) AS SINGLE
  231.     DIM i AS SINGLE
  232.     FOR i = 0 TO PERLIN_SIZE + 1
  233.         perlin(i) = RND
  234.     NEXT
  236.  
  237. x = ABS(x)
  238. y = ABS(y)
  239. z = ABS(z)
  240.  
  242. xi = INT(x)
  243. yi = INT(y)
  244. zi = INT(z)
  245.  
  247. xf = x - xi
  248. yf = y - yi
  249. zf = z - zi
  250.  
  252. r = 0
  253. ampl = .5
  254.  
  255. FOR o = 1 TO perlin_octaves
  256.     DIM of AS SINGLE, rxf AS SINGLE
  257.     DIM ryf AS SINGLE, n1 AS SINGLE, n2 AS SINGLE, n3 AS SINGLE
  258.     of = xi + INT(yi * (2 ^ PERLIN_YWRAPB)) + INT(zi * (2 ^ PERLIN_ZWRAPB))
  259.  
  260.     rxf = 0.5 * (1.0 - COS(xf * _PI))
  261.     ryf = 0.5 * (1.0 - COS(yf * _PI))
  262.  
  263.     n1 = perlin(of AND PERLIN_SIZE)
  264.     n1 = n1 + rxf * (perlin((of + 1) AND PERLIN_SIZE) - n1)
  265.     n2 = perlin((of + PERLIN_YWRAP) AND PERLIN_SIZE)
  266.     n2 = n2 + rxf * (perlin((of + PERLIN_YWRAP + 1) AND PERLIN_SIZE) - n2)
  267.     n1 = n1 + ryf * (n2 - n1)
  268.  
  269.     of = of + PERLIN_ZWRAP
  270.     n2 = perlin(of AND PERLIN_SIZE)
  271.     n2 = n2 + rxf * (perlin((of + 1) AND PERLIN_SIZE) - n2)
  272.     n3 = perlin((of + PERLIN_YWRAP) AND PERLIN_SIZE)
  273.     n3 = n3 + rxf * (perlin((of + PERLIN_YWRAP + 1) AND PERLIN_SIZE) - n3)
  274.     n2 = n2 + ryf * (n3 - n2)
  275.  
  276.     n1 = n1 + (0.5 * (1.0 - COS(zf * _PI))) * (n2 - n1)
  277.  
  278.     r = r + n1 * ampl
  279.     ampl = ampl * perlin_amp_falloff
  280.     xi = INT(xi * (2 ^ 1))
  281.     xf = xf * 2
  282.     yi = INT(yi * (2 ^ 1))
  283.     yf = yf * 2
  284.     zi = INT(zi * (2 ^ 1))
  285.     zf = zf * 2
  286.  
  287.     IF xf >= 1.0 THEN xi = xi + 1: xf = xf - 1
  288.     IF yf >= 1.0 THEN yi = yi + 1: yf = yf - 1
  289.     IF zf >= 1.0 THEN zi = zi + 1: zf = zf - 1
  291. noise! = r
  293.  
  294. SUB noiseDetail (lod!, falloff!)
  295. IF lod! > 0 THEN perlin_octaves = lod!
  296. IF falloff! > 0 THEN perlin_amp_falloff = falloff!
  298.  
« Last Edit: July 15, 2017, 11:37:52 am by STxAxTIC »
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FellippeHeitor

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Re: Car : Physics Test
« Reply #2 on: July 15, 2017, 11:12:52 am »
That works really well! Good job there, Ashish!

It's a bit hard to turn on/off the lights, as they flicker if you hold "h" a little longer.

Nice how the brakes aren't the hard-artificial type I was expecting, but a more natural "slow it down" thing.

Fellippe.
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Offline Petr

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Re: Car : Physics Test
« Reply #3 on: July 15, 2017, 02:24:56 pm »
Super job, Ashish. Thank for the link! We all here are newbie :-D

i upgrade your 3 lines of code (line 94, 95, 96) for better light switching. Is the same case as in my QB64Player:

Code: QB64: [Select]
  1.     IF _KEYDOWN(ASC("h")) AND TIMER > t THEN
  2.         IF Car.headlight.switched THEN Car.headlight.switched = 0: t = TIMER + .2 ELSE Car.headlight.switched = -1: t = TIMER + .2
  3.     END IF
  4.  
« Last Edit: July 15, 2017, 03:08:06 pm by Petr »
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Offline Ashish

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  • Posts: 630
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Re: Car : Physics Test
« Reply #4 on: July 16, 2017, 12:38:34 am »
@STxAxTIC
I like your modification. I was stuck at that problem and I was unable to calculate the rotation of the wheel. So, I used it to rotate with velocity ( which was not accurate!).
By the way, on the line 191, it should be
Code: QB64: [Select]
  1.     IF obj.frontWheel.vel.x <> 0 THEN obj.frontWheel.ang = obj.frontWheel.pos.x / obj.frontWheel.radius
  2.  

instead of

Code: QB64: [Select]
  1.     IF obj.frontWheel.vel.x <> 0 THEN obj.frontWheel.ang = obj.frontWheel.pos.x / Car.frontWheel.radius
  2.  

right? :)

@FellippeHeitor
Thank you. :)

@Petr
Thank you. :)
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My Projects - https://github.com/AshishKingdom?tab=repositories
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Offline STxAxTIC

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Re: Car : Physics Test
« Reply #5 on: July 16, 2017, 01:01:29 am »
Nice catch Ashish - Yeah, I was going a little too fast when looking for the variable that contained 1/.077=13. Your new correction is probably the better form.
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