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from numpy import array, pi
from os.path import splitext
from enable.kiva_graphics_context import GraphicsContext
from kiva.fonttools import Font
from kiva import constants
def draw(gc):
# colors are 5 doubles: offset, red, green, blue, alpha
starting_color = array([0.0, 1.0, 1.0, 1.0, 1.0])
ending_color = array([1.0, 0.0, 0.0, 0.0, 1.0])
gc.clear()
# diagonal
with gc:
gc.rect(50,25,150,100)
gc.linear_gradient(50,25,150,125,
array([starting_color, ending_color]),
"pad")
gc.draw_path(constants.FILL)
# vertical top to bottom
with gc:
gc.rect(50,150,150,50)
gc.linear_gradient(0,200, 0,150,
array([starting_color, ending_color]),
"pad")
gc.draw_path(constants.FILL)
# horizontal left to right
with gc:
gc.rect(50,200,150,50)
gc.linear_gradient(50,0, 150,0,
array([starting_color, ending_color]),
"pad")
gc.draw_path(constants.FILL)
# vertical bottom to top
with gc:
gc.rect(50,275,150,50)
gc.linear_gradient(0,275, 0,325,
array([starting_color, ending_color]),
"pad")
gc.draw_path(constants.FILL)
# horizontal right to left
with gc:
gc.rect(50,325,150,50)
gc.linear_gradient(200,0, 100,0,
array([starting_color, ending_color]),
"pad")
gc.draw_path(constants.FILL)
# radial
with gc:
gc.arc(325, 75, 50, 0.0, 2*pi)
gc.radial_gradient(325, 75, 50, 325, 75,
array([starting_color, ending_color]),
"pad")
gc.draw_path(constants.FILL)
# radial with focal point in upper left
with gc:
gc.arc(325, 200, 50, 0.0, 2*pi)
gc.radial_gradient(325, 200, 50, 300, 225,
array([starting_color, ending_color]),
"pad")
gc.draw_path(constants.FILL)
# radial with focal point in bottom right
with gc:
gc.arc(325, 325, 50, 0.0, 2*pi)
gc.radial_gradient(325, 325, 50, 350, 300,
array([starting_color, ending_color]),
"pad")
gc.draw_path(constants.FILL)
return
def main():
gc = GraphicsContext((500, 500))
gc.scale_ctm(1.25, 1.25)
draw(gc)
gc.save(splitext(__file__)[0]+'.png', file_format='png')
if __name__ == '__main__':
main()
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