penguin86/python-sdl-racing-sim
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Trying to smooth curves

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Daniele Verducci (Slimpenguin) 2023-01-18 08:02:00 +01:00
parent 5e23b1278b
commit ea1fba23ad
1 changed files with 40 additions and 2 deletions
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42
racing-sim.py
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@ -39,6 +39,17 @@ KERB_WIDTH = 0.05
PLAYER_MAX_SPEED = 1.0
PLAYER_SPEED_INCREMENT = 0.5
# Track: array of sections. Section: [curvature, length]
TRACK = [
{"curv": 0.0, "dist": 2},
{"curv": 1.0, "dist": 2},
{"curv": 0.0, "dist": 2},
{"curv": 1.0, "dist": 2},
{"curv": 0.0, "dist": 2},
{"curv": 1.0, "dist": 2},
{"curv": 0.0, "dist": 2},
]
class Main:
def __init__(self):
@ -55,6 +66,9 @@ class Main:
self.playerSpeed = 0.0
self.distance = 0.0
# Interpolated values
self.interpolatedRoadCurvature = 0.0
def run(self):
lastFpsCalcTime = 0
lastDraw = 0
@ -78,7 +92,7 @@ class Main:
elif keystate[sdl2.SDL_SCANCODE_UP]:
self.playerSpeed = min(self.playerSpeed + PLAYER_SPEED_INCREMENT * elapsedTime, PLAYER_MAX_SPEED)
elif keystate[sdl2.SDL_SCANCODE_DOWN]:
self.playerSpeed = max(self.playerSpeed - PLAYER_SPEED_INCREMENT * elapsedTime, 0)
self.playerSpeed = max(self.playerSpeed - PLAYER_SPEED_INCREMENT * 4 * elapsedTime, 0) # *4: brakes more than accelerates
# Draw
self.draw()
@ -111,12 +125,36 @@ class Main:
sdl2.SDL_SetRenderDrawColor(self.renderer, ROAD_COLOR[0], ROAD_COLOR[1], ROAD_COLOR[2], sdl2.SDL_ALPHA_OPAQUE)
sdl2.SDL_RenderFillRect(self.renderer, sdl2.SDL_Rect(0, int(WIN_HEIGHT/2), WIN_WIDTH, int(WIN_HEIGHT)))
# Find current track section
trackSectionsSumDist = 0
sectionNo = 0
currentSection = None
for section in TRACK:
trackSectionsSumDist = trackSectionsSumDist + section["dist"]
sectionNo = sectionNo + 1
if self.distance < trackSectionsSumDist:
currentSection = section
break
if not currentSection:
# Reached the last segment: loop back to first one
self.distance = 0
currentSection = TRACK[0]
# Calculate road center based on section
distanceDrivenInThisSection = self.distance - trackSectionsSumDist + currentSection["dist"]
interpolation = max(min(distanceDrivenInThisSection / (section["dist"] / 4), 1.0), 0.01) # Range 0.01 - 1.0
self.interpolatedRoadCurvature = (currentSection["curv"] * interpolation + self.interpolatedRoadCurvature * (1 - interpolation)) / 2
print([sectionNo, self.interpolatedRoadCurvature, currentSection["curv"], interpolation])
#self.interpolatedRoadCurvature = (self.interpolatedRoadCurvature + currentSection["curv"]) / 2
# Draw road
for y in range(int(RENDER_HEIGHT/2), RENDER_HEIGHT):
perspectiveMult = (y - RENDER_HEIGHT / 2) / (RENDER_HEIGHT / 2) * 0.8 + 0.2 # Range 0.2 - 1.0
roadWidth = 0.6
roadWidthPixels = roadWidth * RENDER_WIDTH * perspectiveMult
roadCenterPixels = (RENDER_WIDTH - roadWidth) / 2
roadCenter = ((self.interpolatedRoadCurvature * 2) * math.pow(1.0 - perspectiveMult, 3)) + self.interpolatedRoadCurvature / 8
roadCenterPixels = roadCenter * RENDER_WIDTH + RENDER_WIDTH / 2
kerbWidth = KERB_WIDTH * RENDER_WIDTH * perspectiveMult
# Kerb color: Calculate perspective: the lines near the user are taller than the one further away