utils.py 文件源码

def linear_gradient(start_hex, finish_hex="#FFFFFF", n=10):
    """Returns a gradient list of (n) colors between
    two hex colors. start_hex and finish_hex
    should be the full six-digit color string,
    including the number sign ("#FFFFFF")

    Code from http://bsou.io/posts/color-gradients-with-python
    """
    # Starting and ending colors in RGB form
    s = hex2color(start_hex)
    f = hex2color(finish_hex)
    # Initialize a list of the output colors with the starting color
    RGB_list = [rgb2hex(s)]
    # Calcuate a color at each evenly spaced value of t from 1 to n
    for t in range(1, n):
        # Interpolate RGB vector for color at the current value of t
        curr_vector = [s[j] + (t / (n - 1)) * (f[j] - s[j])
                       for j in range(3)]
        # Add it to our list of output colors
        RGB_list.append(rgb2hex(curr_vector))
    return RGB_list