# RENDER THIS DOCUMENT WITH DRAWBOT: http://www.drawbot.com
from drawBot import *
import math

# CONSTANTS
W = 1024  # Width
H = 256   # Height
M = 32    # Margin
U = 32    # Unit (Grid Unit)
F = 64    # Frames (Animation)

# REMAP INPUT RANGE TO VARIABLE FONT AXIS RANGE
# (E.G. SINE WAVE(-1,1) to WGHT(100,900))
def remap(value, inputMin, inputMax, outputMin, outputMax):
    inputSpan  = inputMax  - inputMin   # FIND INPUT RANGE SPAN
    outputSpan = outputMax - outputMin  # FIND OUTPUT RANGE SPAN
    valueScaled = float(value - inputMin) / float(inputSpan)
    return outputMin + (valueScaled * outputSpan)

# DRAWS A GRID
def grid():
    strokeWidth(1)
    stroke(0.1)
    step_X = 0
    step_Y = 0
    increment_X = U
    increment_Y = U
    for x in range(31):
        polygon( (M+step_X, M), (M+step_X, H-M) )
        step_X += increment_X
    for y in range(7):
        polygon( (M, M+step_Y), (W-M, M+step_Y) )
        step_Y += increment_Y
    fill(None)
    rect(M, M, W-(2*M), H-(2*M))
    fill(0.9)
    stroke(None)

# NEW PAGE
def new_page():
    newPage(W, H)
    frameDuration(1/6)
    fill(0)
    rect(-2, -2, W+2, H+2)

# TEST FONT
font("../../fonts/variable/CaskaydiaCove[wght].ttf")
for axis, data in listFontVariations().items():
    print((axis, data))
varWght = 0
step = -1

# MAIN
for frame in range(F-1):
    new_page()
    font("../../fonts/variable/CaskaydiaCove[wght].ttf")
    grid() # Toggle for grid view
    fontSize((M*3))
    #print("Sine step:", sin(step))

    varWght = remap(sin(step),-1,1,200,700)
    fontVariations(wght=varWght)
    text("Caskaydia Cove", (M, M*4))
    fill(0.3)
    weight = str(int(varWght))
    weightText = '#Weight[wght]:' + weight
    fontVariations(wght=400)
    text(weightText, (M, M*1))

    # MOVES THE ANIMATION FORWARD
    step += 0.1

# SAVE THE ANIMATION IN THIS SCRIPT'S DIRECTORY LOCATION
# POST-PROCESS: gifsicle -i variable-font-specimen.gif --optimize=16 -o output.gif
saveImage("variable-font-specimen.gif")