penguin86/python-sdl-racing-sim
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This commit is contained in:
Daniele Verducci 2023-01-15 10:40:35 +01:00
parent 207bae6e1d
commit eddb03e8a3
1 changed files with 25 additions and 4 deletions
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29
racing-sim.py
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@ -35,6 +35,8 @@ GRASS_COLOR = [0,127,0]
KERB_COLOR = [255,0,0]
ROAD_COLOR = [127,127,127]
KERB_WIDTH = 0.05
PLAYER_MAX_SPEED = 1.0
PLAYER_SPEED_INCREMENT = 1.0
class Main:
@ -48,8 +50,14 @@ class Main:
self.renderer = sdl2.SDL_CreateRenderer(self.window, -1,sdl2.SDL_RENDERER_ACCELERATED |sdl2.SDL_RENDERER_PRESENTVSYNC)
self.surface = sdl2.SDL_CreateRGBSurface(0,WIN_WIDTH,WIN_HEIGHT,32,0,0,0,0)
# Player
self.playerSpeed = 0.0
self.distance = 0.0
def run(self):
lastFpsCalcTime = 0
lastDraw = 0
elapsedTime = 0
frames = 0
running = True
@ -60,18 +68,25 @@ class Main:
running = False
break
# Keys
keystate = sdl2.SDL_GetKeyboardState(None)
if keystate[sdl2.SDL_SCANCODE_LEFT]:
print("left")
elif keystate[sdl2.SDL_SCANCODE_RIGHT]:
print("right")
elif keystate[sdl2.SDL_SCANCODE_UP]:
print("accelerate")
self.playerSpeed = min(self.playerSpeed + PLAYER_SPEED_INCREMENT * elapsedTime, PLAYER_MAX_SPEED)
elif keystate[sdl2.SDL_SCANCODE_DOWN]:
print("brake")
self.playerSpeed = max(self.playerSpeed - PLAYER_SPEED_INCREMENT * elapsedTime, 0)
# Draw
self.draw()
# Update speed and distance
elapsedTime = time.time() - lastDraw
lastDraw = time.time()
self.distance = self.distance + self.playerSpeed * elapsedTime
# Calculate FPS
frames = frames + 1
if time.time() - lastFpsCalcTime > 1:
@ -103,7 +118,13 @@ class Main:
roadCenterPixels = (RENDER_WIDTH - roadWidth) / 2
kerbWidth = KERB_WIDTH * RENDER_WIDTH * perspectiveMult
sdl2.SDL_SetRenderDrawColor(self.renderer, KERB_COLOR[0], KERB_COLOR[1], KERB_COLOR[2], sdl2.SDL_ALPHA_OPAQUE)
# Calculate perspective: the lines near the user are taller than the one further away
# This is a modified sine, "stretched" based on the distance (the y axis)
colorModifier = 0
if math.sin(50.0 * math.pow(1.0 - perspectiveMult, 2) + self.distance * 30) > 0:
colorModifier = 64
sdl2.SDL_SetRenderDrawColor(self.renderer, KERB_COLOR[0] + colorModifier, KERB_COLOR[1] + colorModifier, KERB_COLOR[2] + colorModifier, sdl2.SDL_ALPHA_OPAQUE)
# Left Kerb
x = roadCenterPixels - roadWidthPixels / 2 - kerbWidth
self.drawScaledHLine(x, y, kerbWidth)
@ -111,7 +132,7 @@ class Main:
x = roadCenterPixels + roadWidthPixels / 2
self.drawScaledHLine(x, y, kerbWidth)
sdl2.SDL_SetRenderDrawColor(self.renderer, GRASS_COLOR[0], GRASS_COLOR[1], GRASS_COLOR[2], sdl2.SDL_ALPHA_OPAQUE)
sdl2.SDL_SetRenderDrawColor(self.renderer, GRASS_COLOR[0] + colorModifier, GRASS_COLOR[1] + colorModifier, GRASS_COLOR[2] + colorModifier, sdl2.SDL_ALPHA_OPAQUE)
# Left Grass
xEnd = roadCenterPixels - roadWidthPixels / 2 - kerbWidth
self.drawScaledHLine(0, y, xEnd) # xEnd = length, because xStart = 0