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import pytest
from gi.repository import Gtk
from gaphas.tool.zoom import Zoom, on_begin, on_scale_changed, zoom_tool
@pytest.fixture
def zoom_data(view):
zoom_data = Zoom()
zoom_data.x0 = 0
zoom_data.y0 = 0
zoom_data.sx = 1
zoom_data.sy = 1
zoom_data.begin(view.matrix, 0, 0)
return zoom_data
def test_can_create_zoom_tool(view):
tool = zoom_tool()
view.add_controller(tool)
assert isinstance(tool, Gtk.Gesture)
def test_begin_state(zoom_data, view):
class MockGesture:
def get_widget(self):
return view
def get_point(self, sequence):
return True, 1, 2
gesture = MockGesture()
sequence = None
on_begin(gesture, sequence, zoom_data)
assert zoom_data.x0 == 1
assert zoom_data.y0 == 2
assert zoom_data.sx == 1
assert zoom_data.sy == 1
@pytest.mark.asyncio
async def test_scaling(zoom_data, view):
tool = zoom_tool()
view.add_controller(tool)
on_scale_changed(tool, 1.2, zoom_data)
assert view.matrix[0] == pytest.approx(1.2)
assert view.matrix[3] == pytest.approx(1.2)
@pytest.mark.asyncio
async def test_multiple_scaling_events(zoom_data, view):
tool = zoom_tool()
view.add_controller(tool)
on_scale_changed(tool, 1.1, zoom_data)
on_scale_changed(tool, 1.2, zoom_data)
assert view.matrix[0] == pytest.approx(1.2)
assert view.matrix[3] == pytest.approx(1.2)
@pytest.mark.asyncio
async def test_scaling_with_unequal_scaling_factor(zoom_data, view):
tool = zoom_tool()
view.add_controller(tool)
zoom_data.sx = 2
on_scale_changed(tool, 1.2, zoom_data)
assert view.matrix[0] == pytest.approx(2.4)
assert view.matrix[3] == pytest.approx(1.2)
@pytest.mark.asyncio
async def test_zoom_should_center_around_mouse_cursor(zoom_data, view):
tool = zoom_tool()
view.add_controller(tool)
zoom_data.x0 = 100
zoom_data.y0 = 50
on_scale_changed(tool, 1.2, zoom_data)
assert view.matrix[4] == pytest.approx(-20.0)
assert view.matrix[5] == pytest.approx(-10.0)
@pytest.mark.asyncio
async def test_zoom_out_should_be_limited_to_20_percent(zoom_data, view):
tool = zoom_tool()
view.add_controller(tool)
on_scale_changed(tool, 0.0, zoom_data)
assert view.matrix[0] == pytest.approx(0.2)
assert view.matrix[3] == pytest.approx(0.2)
@pytest.mark.asyncio
async def test_zoom_in_should_be_limited_to_20_times(zoom_data, view):
tool = zoom_tool()
view.add_controller(tool)
on_scale_changed(tool, 100.0, zoom_data)
assert view.matrix[0] == pytest.approx(20)
assert view.matrix[3] == pytest.approx(20)
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