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dummy.py
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dummy.py
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from enable.kiva_graphics_context import GraphicsContext
from kiva import affine, agg, constants
from kiva.fonttools import Font
# Do some basic drawing tests and write the results out to PNG files.
# This is mostly a python translation of the tests in kiva/agg/src/dummy.cpp
black = (0.0, 0.0, 0.0, 1.0)
white = (1.0, 1.0, 1.0, 1.0)
lightgray = (0.2, 0.2, 0.2, 1.0)
red = (1.0, 0.0, 0.0, 1.0)
green = (0.0, 1.0, 0.0, 1.0)
blue = (0.0, 0.0, 1.0, 1.0)
niceblue = (0.411, 0.584, 0.843, 1.0)
PI = 3.141592654
def draw_sub_image(gc, width, height):
gc.clear(white)
fill_color = green[:3] + (0.4,) #We want green, but with an alpha of 0.4
gc.set_fill_color(fill_color)
gc.rect(0,0,width,height)
gc.fill_path()
gc.set_stroke_color(red)
gc.move_to(0.0, 0.0)
gc.line_to(width, height)
gc.stroke_path()
gc.set_stroke_color(blue)
gc.move_to(0.0, height)
gc.line_to(width, 0.0)
gc.stroke_path()
def test_arc_to2(gc, x2, y2, radiusstep=25.0):
gc.set_stroke_color(lightgray)
gc.move_to(0,0)
gc.line_to(100,0)
gc.line_to(x2, y2)
gc.stroke_path()
gc.set_stroke_color(black)
numradii = 7
for i in range(numradii):
gc.move_to(0,0)
gc.arc_to(100, 0, x2, y2, i*radiusstep+20.0)
gc.stroke_path()
def test_arc_curve(gc):
with gc:
gc.translate_ctm(50.0, 50.0)
gc.rotate_ctm(PI/8)
gc.set_stroke_color(blue)
gc.rect(0.5, 0.5, 210, 210)
gc.stroke_path()
gc.set_stroke_color(black)
gc.set_line_width(1)
gc.move_to(50.5, 25.5)
gc.arc(50.5, 50.5, 50.0, 0.0, PI/2, False)
gc.move_to(100.5, 50.5)
gc.arc(100.5, 50.5, 50.0, 0.0, -PI/2*0.8, False)
gc.stroke_path()
with gc:
gc.translate_ctm(250.5, 50.5)
gc.set_stroke_color(blue)
gc.rect(0.5, 0.5, 250.0, 250.0)
gc.stroke_path()
gc.set_stroke_color(red)
gc.move_to(100.0, 100.0)
gc.line_to(100.0, 150.0)
gc.arc_to(100.0, 200.0, 150.0, 200.0, 50.0)
gc.line_to(200.0, 200.0)
gc.close_path()
gc.stroke_path()
def test_arc_to(gc):
# We don't have compiled paths yet, so we simulate them by python functions
def axes(gc):
gc.move_to(0.5, 50.5)
gc.line_to(100.5, 50.5)
gc.move_to(50.5, 0.5)
gc.line_to(50.5, 100.5)
def box(gc):
gc.move_to(0.5, 0.5)
gc.line_to(100.5, 0.5)
gc.line_to(100.5, 100.5)
gc.line_to(0.5, 100.5)
gc.close_path()
def arc(gc):
gc.move_to(10,10)
gc.line_to(20,10)
gc.arc_to(40, 10, 40, 30, 20)
gc.line_to(40,40)
def whole_shebang(gc):
with gc:
axes(gc)
box(gc)
gc.translate_ctm(0.0, 50.5)
arc(gc)
gc.translate_ctm(50.5, 50.5)
gc.rotate_ctm(-PI/2)
arc(gc)
gc.rotate_ctm(PI/2)
gc.translate_ctm(50.5, -50.5)
gc.rotate_ctm(-PI)
arc(gc)
gc.rotate_ctm(PI)
gc.translate_ctm(-50.5, -50.5)
gc.rotate_ctm(-3*PI/2)
arc(gc)
gc.set_stroke_color(red)
gc.set_line_width(1.0)
with gc:
gc.translate_ctm(50.5, 300.5)
whole_shebang(gc)
gc.stroke_path()
gc.translate_ctm(130.5, 50.0)
with gc:
gc.rotate_ctm(PI/6)
whole_shebang(gc)
gc.set_stroke_color(blue)
gc.stroke_path()
gc.translate_ctm(130.5, 0.0)
with gc:
gc.rotate_ctm(PI/3)
gc.scale_ctm(1.0, 2.0)
whole_shebang(gc)
gc.stroke_path()
with gc:
gc.translate_ctm(150.5, 20.5)
test_arc_to2(gc, 160.4, 76.5, 50.0)
gc.translate_ctm(120.5, 100.5)
gc.scale_ctm(-1.0, 1.0)
test_arc_to2(gc, 70.5, 96.5)
gc.translate_ctm(-300.5, 100.5)
gc.scale_ctm(0.75, -1.0)
test_arc_to2(gc, 160.5, 76.5, 50.0)
def test_simple_clip_stack(gc):
gc.clear(white)
gc.clip_to_rect(100.0, 100.0, 1.0, 1.0)
gc.rect(0.0, 0.0, gc.width(), gc.height())
gc.set_fill_color(red)
gc.fill_path()
def test_clip_stack(gc):
sub_windows = ((10.5, 250, 200, 200),
(220.5, 250, 200, 200),
(430.5, 250, 200, 200),
(10.5, 10, 200, 200),
(220.5, 10, 200, 200),
(430.5, 10, 200, 200))
gc.set_line_width(2)
gc.set_stroke_color(black)
gc.rects(sub_windows)
gc.stroke_path()
img = GraphicsContext((200, 200))
main_rects = ((40.5, 30.5, 120, 50),
(40.5, 120.5, 120, 50))
disjoint_rects = ((60.5, 115.5, 80, 15),
(60.5, 70.5, 80, 15))
vert_rect = (60.5, 10.5, 55, 180)
# Draw the full image
draw_sub_image(img, 200, 200)
gc.draw_image(img, sub_windows[0])
img.clear()
# First clip
img.clip_to_rects(main_rects)
draw_sub_image(img, 200, 200);
gc.draw_image(img, sub_windows[1])
# Second Clip
with img:
img.clear()
img.clip_to_rects(main_rects)
img.clip_to_rect(*vert_rect)
draw_sub_image(img, 200, 200)
gc.draw_image(img, sub_windows[2])
# Pop back to first clip
img.clear()
draw_sub_image(img, 200, 200)
gc.draw_image(img, sub_windows[3])
# Adding a disjoing set of rects
img.clear()
with img:
img.clip_to_rects(main_rects)
img.clip_to_rects(disjoint_rects)
draw_sub_image(img, 200, 200)
gc.draw_image(img, sub_windows[4])
# Pop back to first clip
img.clear()
draw_sub_image(img, 200, 200)
gc.draw_image(img, sub_windows[5])
def test_handling_text(gc):
font = Font(face_name="Arial", size = 32)
gc.set_font(font)
gc.translate_ctm(100.0, 100.0)
gc.move_to(-5,0)
gc.line_to(5,0)
gc.move_to(0,5)
gc.line_to(0,-5)
gc.move_to(0,0)
gc.stroke_path()
txtRot = agg.rotation_matrix(PI/6)
gc.set_text_matrix(txtRot)
gc.show_text("Hello")
txtRot.invert()
gc.set_text_matrix(txtRot)
gc.show_text("inverted")
if __name__ == "__main__":
tests = ((test_clip_stack, "clip_stack.png"),
(test_arc_to, "arc_to.png"),
(test_handling_text, "handling_text.png"))
for test_func, filename in tests:
img = GraphicsContext((800, 600))
img.clear(white)
test_func(img)
img.save(filename)