Python Pen.line_forward方法代码示例

# 需要导入模块: from canoepaddle.pen import Pen [as 别名]
# 或者: from canoepaddle.pen.Pen import line_forward [as 别名]
def test_circle_line_overlap():
    # Draw a circle that is above one line but below the other line.
    p = Pen()

    p.stroke_mode(1.0, color=(1.0, 0.0, 0.0))
    p.move_to((0, 0))
    p.turn_to(0)
    p.line_forward(4)

    p.fill_mode(color=(0.0, 1.0, 0.0))
    p.move_to((2, 2))
    p.circle(2)

    p.stroke_mode(1.0, color=(0.0, 0.0, 1.0))
    p.move_to((0, 4))
    p.turn_to(0)
    p.line_forward(4)

    assert_equal(
        p.paper.svg_elements(1),
        [
            (
                '<path d="M0.0,-0.5 L0.0,0.5 L4.0,0.5 L4.0,-0.5 L0.0,-0.5 z" '
                'fill="#ff0000" />'
            ),
            (
                '<path d="M4.0,-2.0 A 2.0,2.0 0 0 0 0.0,-2.0 '
                'A 2.0,2.0 0 0 0 4.0,-2.0 z" fill="#00ff00" />'
            ),
            (
                '<path d="M0.0,-4.5 L0.0,-3.5 L4.0,-3.5 L4.0,-4.5 L0.0,-4.5 z" '
                'fill="#0000ff" />'
            ),
        ]
    )

# 需要导入模块: from canoepaddle.pen import Pen [as 别名]
# 或者: from canoepaddle.pen.Pen import line_forward [as 别名]
def test_offwidth_arc_joins():
    # Join arcs and lines of different widths.
    p = Pen()
    p.move_to((0, 0))
    p.turn_to(0)

    p.stroke_mode(0.8)
    p.line_forward(5)
    p.turn_left(45)
    p.stroke_mode(3.0)
    p.arc_left(90, 5)

    p.turn_to(-180)
    p.line_forward(5)
    p.turn_left(45)
    p.stroke_mode(0.8)
    p.arc_left(45, 5)

    p.turn_right(90)
    p.stroke_mode(3.0)
    p.arc_right(90, 4)

    assert_svg_file(
        p, 3,
        'test_offwidth_arc_joins.svg'
    )

# 需要导入模块: from canoepaddle.pen import Pen [as 别名]
# 或者: from canoepaddle.pen.Pen import line_forward [as 别名]
def test_straight_joint_headings():
    # The math in calculating joint geometry can get numerically unstable
    # very close to straight joints at various headings.
    for heading_angle in range(0, 45):
        p = Pen()
        p.stroke_mode(1.0)
        p.move_to((0, 0))
        p.turn_to(heading_angle)
        p.line_forward(10)
        p.line_forward(10)

        path = p.paper.paths[0]
        path.render_path(2)  # Doesn't crash.

        # Check that the joint angle is 90 degrees from the heading.
        assert_equal(len(p.paper.paths), 1)
        segments = p.paper.paths[0].segments
        assert_equal(len(segments), 2)
        s0, s1 = segments

        target_angle = (heading_angle + 90) % 180

        joint_angle = math.degrees(vec.heading(vec.vfrom(s0.b_right, s0.b_left)))
        assert_almost_equal(joint_angle % 180, target_angle)

        joint_angle = math.degrees(vec.heading(vec.vfrom(s1.a_right, s1.a_left)))
        assert_almost_equal(joint_angle % 180, target_angle)

# 需要导入模块: from canoepaddle.pen import Pen [as 别名]
# 或者: from canoepaddle.pen.Pen import line_forward [as 别名]
def test_color_formats():
    for color, output in [
        (
            (1.0, 0.0, 0.0),
            '#ff0000',
        ),
        (
            Color.NewFromHtml('red'),
            '#ff0000',
        ),
        (
            'green',
            '#008000',
        ),
        (
            '#123456',
            '#123456',
        ),
    ]:
        p = Pen()
        p.stroke_mode(2.0, color)
        p.move_to((0, 0))
        p.turn_to(0)
        p.line_forward(5)

        assert_equal(
            p.paper.svg_elements(0)[0],
            '<path d="M0,-1 L0,1 L5,1 L5,-1 L0,-1 z" fill="{}" />'.format(output)
        )

# 需要导入模块: from canoepaddle.pen import Pen [as 别名]
# 或者: from canoepaddle.pen.Pen import line_forward [as 别名]
def test_custom_cap():

    def circle_cap(pen, end):
        pen.arc_to(end)

    p = Pen()
    p.stroke_mode(2.0)
    p.move_to((0, 0))
    p.turn_to(0)
    p.line_forward(5)
    p.last_segment().end_cap = circle_cap
    assert_path_data(
        p, 0,
        'M0,-1 L0,1 L5,1 A 1,1 0 0 0 5,-1 L0,-1 z'
    )

    p = Pen()
    p.stroke_mode(2.0)
    p.move_to((0, 0))
    p.turn_to(0)
    p.line_forward(5)
    p.last_segment().start_cap = circle_cap
    assert_path_data(
        p, 0,
        'M0,-1 A 1,1 0 1 0 0,1 L5,1 L5,-1 L0,-1 z'
    )

# 需要导入模块: from canoepaddle.pen import Pen [as 别名]
# 或者: from canoepaddle.pen.Pen import line_forward [as 别名]
 def draw(offset):
     p = Pen()
     p.stroke_mode(1.0)
     p.move_to((0, 0))
     p.turn_to(0)
     p.line_forward(0.5 + offset, end_slant=45)
     return p

# 需要导入模块: from canoepaddle.pen import Pen [as 别名]
# 或者: from canoepaddle.pen.Pen import line_forward [as 别名]
def test_outliner_mode():
    # We can set up a pattern in one mode,
    p = Pen()
    p.set_mode(StrokeOutlineMode(sqrt3, 0.2 * sqrt3, 'blue', 'black'))

    p.move_to((0, 0))
    p.turn_to(0)
    p.line_forward(5, end_slant=60)

    # Then continue it in another mode without caring what the first mode was.
    old_mode = p.mode
    p.set_mode(p.mode.outliner_mode())

    p.turn_to(60)
    p.move_forward(1.0)

    p.turn_left(60)
    p.line_forward(2.0)
    p.turn_right(120)
    p.line_forward(2.0)
    p.turn_right(120)
    p.line_forward(2.0)

    p.turn_to(60)
    p.move_forward(3.0)
    p.turn_to(120)

    p.set_mode(old_mode)

    p.line_forward(5, start_slant=60)

    assert_svg_file(
        p, 3,
        'test_outliner_mode.svg'
    )

# 需要导入模块: from canoepaddle.pen import Pen [as 别名]
# 或者: from canoepaddle.pen.Pen import line_forward [as 别名]
def test_start_slant_legal_joint():
    # Create a joint that is only legal because of the start slant.
    p = Pen()
    p.outline_mode(1.0, 0.1)
    p.move_to((0, 0))
    p.turn_to(0)
    p.line_forward(0.8, start_slant=-45)
    p.turn_left(90)
    p.outline_mode(2.0, 0.1)
    p.line_forward(5)

# 需要导入模块: from canoepaddle.pen import Pen [as 别名]
# 或者: from canoepaddle.pen.Pen import line_forward [as 别名]
def test_line():
    p = Pen()
    p.fill_mode()
    p.move_to((0, 0))
    p.turn_to(0)
    p.line_forward(5)

    assert_path_data(
        p, 0,
        'M0,0 L5,0'
    )

# 需要导入模块: from canoepaddle.pen import Pen [as 别名]
# 或者: from canoepaddle.pen.Pen import line_forward [as 别名]
def test_straight_joint():
    p = Pen()
    p.stroke_mode(2.0)
    p.move_to((0, 0))
    p.turn_to(0)
    p.line_forward(3)
    p.line_forward(3)

    assert_path_data(
        p, 0,
        'M0,-1 L0,1 L3,1 L6,1 L6,-1 L3,-1 L0,-1 z'
    )

# 需要导入模块: from canoepaddle.pen import Pen [as 别名]
# 或者: from canoepaddle.pen.Pen import line_forward [as 别名]
def test_zero_length_side():
    # It is possible and legal to create a segment that just barely goes to
    # zero on one side.
    p = Pen()
    p.stroke_mode(2.0)
    p.move_to((0, 0))
    p.turn_to(0)
    p.line_forward(1.0, end_slant=45)

    assert_path_data(
        p, 0,
        'M0,-1 L0,1 L2,-1 L0,-1 z',
    )

# 需要导入模块: from canoepaddle.pen import Pen [as 别名]
# 或者: from canoepaddle.pen.Pen import line_forward [as 别名]
def test_joint_loop_color():
    p = Pen()

    p.move_to((0, 0))
    p.turn_to(0)

    # Draw a square with one side a different color. It joins to the
    # beginning correctly.
    p.stroke_mode(2.0, color='black')
    p.line_forward(5)
    p.turn_left(90)
    p.line_forward(5)
    p.turn_left(90)
    p.line_forward(5)
    p.turn_left(90)
    p.stroke_mode(2.0, color='red')
    p.line_forward(5)

    assert_equal(len(p.paper.paths), 1)

    assert_path_data(
        p, 0,
        [
            'M1,-1 L-1,1 L6,1 L6,-6 L-1,-6 L1,-4 L4,-4 L4,-1 L1,-1 z',
            'M1,-4 L-1,-6 L-1,1 L1,-1 L1,-4 z',
        ]
    )

# 需要导入模块: from canoepaddle.pen import Pen [as 别名]
# 或者: from canoepaddle.pen.Pen import line_forward [as 别名]
def test_outline():
    p = Pen()
    p.move_to((0, 0))
    p.turn_to(0)
    p.outline_mode(1.0, 0.2)
    p.line_forward(3)

    assert_path_data(
        p, 1,
        (
            'M-0.1,-0.6 L-0.1,0.6 L3.1,0.6 L3.1,-0.6 L-0.1,-0.6 z '
            'M0.1,-0.4 L2.9,-0.4 L2.9,0.4 L0.1,0.4 L0.1,-0.4 z'
        )
    )

# 需要导入模块: from canoepaddle.pen import Pen [as 别名]
# 或者: from canoepaddle.pen.Pen import line_forward [as 别名]
def test_line_line_half_illegal_joint():
    # The outside edge meets, but the inside is too short to meet.
    p = Pen()
    p.stroke_mode(1.0)
    p.move_to((0, 0))
    p.turn_to(0)

    p.line_forward(2)
    p.turn_left(165)
    p.line_forward(2)

    assert_path_data(
        p, 2,
        (
            'M0.00,-0.50 L0.00,0.50 L5.80,0.50 L0.20,-1.00 '
            'L-0.06,-0.03 L1.87,0.48 L2.00,-0.50 L0.00,-0.50 z'
        )
    )

    p = Pen()
    p.stroke_mode(1.0)
    p.move_to((0, 0))
    p.turn_to(0)

    p.line_forward(2)
    p.turn_right(165)
    p.line_forward(2)

    assert_path_data(
        p, 2,
        (
            'M0.00,-0.50 L0.00,0.50 L2.00,0.50 L1.87,-0.48 '
            'L-0.06,0.03 L0.20,1.00 L5.80,-0.50 L0.00,-0.50 z'
        )
    )

# 需要导入模块: from canoepaddle.pen import Pen [as 别名]
# 或者: from canoepaddle.pen.Pen import line_forward [as 别名]
def test_long_line_thick():
    p = Pen()
    p.stroke_mode(2.0)
    p.move_to((0, 0))
    p.turn_to(0)
    for _ in range(2):
        p.line_forward(5)
        p.turn_right(90)
        p.line_forward(5)
        p.turn_left(90)

    assert_path_data(
        p, 0,
        'M0,-1 L0,1 L4,1 L4,6 L9,6 L9,10 L11,10 L11,4 L6,4 L6,-1 L0,-1 z'
    )