python-enable 4.3.0-2 / usr / share / doc / python-enable / examples / kiva / dummy.py

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from __future__ import with_statement

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)

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