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Git issue #7216 - Add a "ruler" tool to the plot UI #8774

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Git issue #7216 - Add a "ruler" tool to the plot UI #8774

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fe49f30
Git issue #7216 - A simple ruler widget
terranjp Jun 18, 2017
aa4a529
Added tests
terranjp Jul 17, 2017
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101 changes: 101 additions & 0 deletions lib/matplotlib/tests/test_widgets.py
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Original file line number Diff line number Diff line change
Expand Up @@ -376,6 +376,7 @@ def test_polygon_selector():
('on_key_release', dict(key='control'))]
+ polygon_place_vertex(50, 150)
+ polygon_place_vertex(75, 50))

check_polygon_selector(event_sequence, expected_result, 1)

# Move first two vertices at once before completing the polygon.
Expand Down Expand Up @@ -449,3 +450,103 @@ def test_polygon_selector():
+ polygon_place_vertex(50, 150)
+ polygon_place_vertex(50, 50))
check_polygon_selector(event_sequence, expected_result, 1)


def test_ruler():
ax = get_ax()

x0 = 10
y0 = 10
x1 = 50
y1 = 40

ruler = widgets.Ruler(ax)

# Draw rule from x=10, y=10 to x=50, y=40
do_event(ruler, '_on_press', xdata=x0, ydata=y0, button=1)
do_event(ruler, '_on_move', xdata=x1, ydata=y1, button=1)
do_event(ruler, '_on_release', xdata=x1, ydata=y1, button=1)

assert ruler.ruler_length == 50
assert ruler.ruler_dx == 40
assert ruler.ruler_dy == 30

# Lock ruler to to vertical axes with shift key press
do_event(ruler, '_on_press', xdata=x0, ydata=y0, button=1)
do_event(ruler, '_on_key_press', key='shift')
do_event(ruler, '_on_move', xdata=x1, ydata=y1, button=1)
do_event(ruler, '_on_release', xdata=x1, ydata=y1, button=1)
do_event(ruler, '_on_key_release', key='shift')

assert ruler.ruler_length == 40
assert ruler.ruler_dx == 40
assert ruler.ruler_dy == 0

# Lock ruler to to horizontal axes with control key press
do_event(ruler, '_on_press', xdata=x0, ydata=y0, button=1)
do_event(ruler, '_on_key_press', key='control')
do_event(ruler, '_on_move', xdata=x1, ydata=y1, button=1)
do_event(ruler, '_on_release', xdata=x1, ydata=y1, button=1)
do_event(ruler, '_on_key_release', key='control')

assert ruler.ruler_length == 30
assert ruler.ruler_dx == 0
assert ruler.ruler_dy == 30

# Draw ruler and then shift end a by right clicking and dragging end node
x2 = 50
y2 = -20

do_event(ruler, '_on_press', xdata=x0, ydata=y0, button=1)
do_event(ruler, '_on_move', xdata=x1, ydata=y1, button=1)
do_event(ruler, '_on_release', xdata=x1, ydata=y1, button=1)
do_event(ruler, '_on_press', xdata=x1, ydata=y1, button=3)
do_event(ruler, '_on_move', xdata=x2, ydata=y2, button=3)
do_event(ruler, '_on_release', xdata=x2, ydata=y2, button=3)

assert ruler.ruler_length == 50
assert ruler.ruler_dx == 40
assert ruler.ruler_dy == -30

# Draw ruler and then shift end b by right clicking and dragging end node
x3 = -30
y3 = -20

do_event(ruler, '_on_press', xdata=x0, ydata=y0, button=1)
do_event(ruler, '_on_move', xdata=x1, ydata=y1, button=1)
do_event(ruler, '_on_release', xdata=x1, ydata=y1, button=1)
do_event(ruler, '_on_press', xdata=x0, ydata=y0, button=3)
do_event(ruler, '_on_move', xdata=x3, ydata=y3, button=3)
do_event(ruler, '_on_release', xdata=x3, ydata=y3, button=3)

assert ruler.ruler_length == 100
assert ruler.ruler_dx == 80
assert ruler.ruler_dy == 60

x0 = -10
y0 = -10
x1 = 10
y1 = 10

xmid = 0
ymid = 0

xnew = 10
ynew = 10

# Draw ruler and then shift the whole ruler by right clicking center node
do_event(ruler, '_on_press', xdata=x0, ydata=y0, button=1)
do_event(ruler, '_on_move', xdata=x1, ydata=y1, button=1)
do_event(ruler, '_on_release', xdata=x1, ydata=y1, button=1)

assert ruler.midline_coords == (0, 0)
assert ruler.ruler_dx == 20
assert ruler.ruler_dy == 20

do_event(ruler, '_on_press', xdata=xmid, ydata=ymid, button=3)
do_event(ruler, '_on_move', xdata=xnew, ydata=ynew, button=3)
do_event(ruler, '_on_release', xdata=xnew, ydata=ynew, button=3)

assert ruler.midline_coords == (10, 10)
assert ruler.ruler_dx == 20
assert ruler.ruler_dy == 20
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