Drawing a boat, on a wave: simplified

boat.py

import display, math


def drawBoat():
    display.pushMatrix()
    drawBoatBottom(0x000000)
    display.translate(-4, 0)
    drawBoatMast(0x000000, 0x000000)
    display.popMatrix()


def drawBoatMast(mastColor, flagColor):
    # 0--1
    # |  |
    # |  6
    # |  |\
    # |  5-4
    # |  |
    # 3--2
    x0, y0 = 0, -23
    x1, y1 = 3, -23
    x2, y2 = 3, 0
    x3, y3 = 0, 0
    x4, y4 = 12, -10
    x5, y5 = 3, -10
    x6, y6 = 3, -20
    display.drawQuad(x0, y0, x1, y1, x2, y2, x3, y3, mastColor)
    display.drawTri(x6, y6, x4, y4, x5, y5, flagColor)


def drawBoatBottom(color):
    # 0--------1
    #  \      /
    #   3----2
    x0, y0 = -20, 0
    x1, y1 = 20, 0
    x2, y2 = 16, 8
    x3, y3 = -16, 8
    display.drawQuad(x0, y0, x1, y1, x2, y2, x3, y3, color)


def drawSun(color):
    display.pushMatrix()
    display.translate(-3, -3 - display.height())
    display.drawCircle(0, 0, 30, 0, 360, True, color)
    display.rotate(sunOffset)
    for i in range(20):
        display.rotate(math.pi / 10)
        display.drawLine(0, 35, 0, 45, color)
    display.popMatrix()


# For good measure.
display.clearMatrix()

display.translate(0, display.height())

sunOffset = 0
offset = 0
boatX = display.width() / 6
boatAngle = 0
boatY = 0

while True:
    display.drawFill(0xffffff)
    drawSun(0x000000)
    for i in range(display.width()):
        wave = math.sin((i + offset) * math.pi / 35) * 8 - 35
        display.drawPixel(i, wave, 0x000000)
        if i & 1:
            for j in range(round(wave - 1) | 1, 0, 2):
                display.drawPixel(i, j + ((i >> 1) & 1) + 1, 0x000000)
    display.pushMatrix()
    waterLevelBeforeBoat = math.sin((boatX + 2 + offset) * math.pi / 35) * 8 - 35
    boatY = math.sin((boatX + offset) * math.pi / 35) * 8 - 35
    boatAngle = math.atan2(waterLevelBeforeBoat - boatY, 2)
    display.translate(boatX, boatY - 6)
    display.rotate(boatAngle)
    drawBoat()
    display.popMatrix()
    offset += 8
    sunOffset += math.pi * 0.025
    display.flush()