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Try to make crosshair lines px perfect

basic_orders
Tyler Goodlet 2021-02-08 07:03:28 -05:00
parent 708ed89894
commit 1ef2d18a41
1 changed files with 16 additions and 7 deletions
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23
piker/ui/_graphics/_cursor.py
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@ -13,6 +13,7 @@
# You should have received a copy of the GNU Affero General Public License # You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>. # along with this program. If not, see <https://www.gnu.org/licenses/>.
""" """
Mouse interaction graphics Mouse interaction graphics
@ -54,7 +55,7 @@ class LineDot(pg.CurvePoint):
index: int, index: int,
plot: 'ChartPlotWidget', # type: ingore # noqa plot: 'ChartPlotWidget', # type: ingore # noqa
pos=None, pos=None,
size: int = 2, # in pxs size: int = 6, # in pxs
color: str = 'default_light', color: str = 'default_light',
) -> None: ) -> None:
pg.CurvePoint.__init__( pg.CurvePoint.__init__(
@ -230,6 +231,9 @@ class Cursor(pg.GraphicsObject):
# computing once, up front, here cuz why not # computing once, up front, here cuz why not
self._y_incr_mult = 1 / self.lsc._symbol.tick_size self._y_incr_mult = 1 / self.lsc._symbol.tick_size
# line width in view coordinates
self._lw = self.pixelWidth() * self.lines_pen.width()
def add_hovered( def add_hovered(
self, self,
item: pg.GraphicsObject, item: pg.GraphicsObject,
@ -244,6 +248,7 @@ class Cursor(pg.GraphicsObject):
) -> None: ) -> None:
# add ``pg.graphicsItems.InfiniteLine``s # add ``pg.graphicsItems.InfiniteLine``s
# vertical and horizonal lines and a y-axis label # vertical and horizonal lines and a y-axis label
vl = plot.addLine(x=0, pen=self.lines_pen, movable=False) vl = plot.addLine(x=0, pen=self.lines_pen, movable=False)
vl.setCacheMode(QtGui.QGraphicsItem.DeviceCoordinateCache) vl.setCacheMode(QtGui.QGraphicsItem.DeviceCoordinateCache)
@ -252,6 +257,7 @@ class Cursor(pg.GraphicsObject):
hl.hide() hl.hide()
yl = YAxisLabel( yl = YAxisLabel(
chart=plot,
parent=plot.getAxis('right'), parent=plot.getAxis('right'),
digits=digits or self.digits, digits=digits or self.digits,
opacity=_ch_label_opac, opacity=_ch_label_opac,
@ -361,10 +367,13 @@ class Cursor(pg.GraphicsObject):
m = self._y_incr_mult m = self._y_incr_mult
iy = round(y * m) / m iy = round(y * m) / m
# px perfect...
line_offset = self._lw / 2
if iy != last_iy: if iy != last_iy:
# update y-range items # update y-range items
self.graphics[plot]['hl'].setY(iy) self.graphics[plot]['hl'].setY(iy + line_offset)
self.graphics[self.active_plot]['yl'].update_label( self.graphics[self.active_plot]['yl'].update_label(
abs_pos=plot.mapFromView(QPointF(ix, iy)), abs_pos=plot.mapFromView(QPointF(ix, iy)),
@ -379,12 +388,12 @@ class Cursor(pg.GraphicsObject):
if ix != last_ix: if ix != last_ix:
for plot, opts in self.graphics.items(): for plot, opts in self.graphics.items():
# move the vertical line to the current "center of bar"
opts['vl'].setX(ix)
# update the chart's "contents" label # update the chart's "contents" label
plot.update_contents_labels(ix) plot.update_contents_labels(ix)
# move the vertical line to the current "center of bar"
opts['vl'].setX(ix + line_offset)
# update all subscribed curve dots # update all subscribed curve dots
for cursor in opts.get('cursors', ()): for cursor in opts.get('cursors', ()):
cursor.setIndex(ix) cursor.setIndex(ix)
@ -397,8 +406,8 @@ class Cursor(pg.GraphicsObject):
# otherwise gobbles tons of CPU.. # otherwise gobbles tons of CPU..
# map back to abs (label-local) coordinates # map back to abs (label-local) coordinates
abs_pos=plot.mapFromView(QPointF(ix, y)), abs_pos=plot.mapFromView(QPointF(ix, iy)),
value=x, value=ix,
) )
self._datum_xy = ix, iy self._datum_xy = ix, iy