1j01/textual-paint
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Fix cells stroked outside the mouse's path

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Use absolute positions instead of delta coordinates.

The deltas would sometimes give points "jutting out" — only by a pixel,
but confusing when trying to do pixel art. You might not even notice it
but it might make you feel like a bad artist until you do.
This commit is contained in:
Isaiah Odhner 2023-04-24 01:40:20 -04:00
parent dc02833f3f
commit 0c42edce9c
1 changed files with 6 additions and 3 deletions
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9
paint.py
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@ -944,8 +944,6 @@ class Canvas(Widget):
self.fix_mouse_event(event)
event.x //= self.magnification
event.y //= self.magnification
event.delta_x //= self.magnification
event.delta_y //= self.magnification
if self.pointer_active:
self.post_message(self.ToolUpdate(event))
@ -1158,6 +1156,8 @@ class PaintApp(App[None]):
# (Line, Rectangle, Ellipse, Rounded Rectangle),
# Select tool (similarly), and Polygon (to detect double-click)
mouse_at_start = Offset(0, 0)
# for brush tools (Pencil, Brush, Eraser, Airbrush)
mouse_previous = Offset(0, 0)
# for Select tool, indicates that the selection is being moved
# and defines the offset of the selection from the mouse
selection_drag_offset = Offset(0, 0)
@ -1912,6 +1912,7 @@ class PaintApp(App[None]):
return
self.mouse_at_start = Offset(event.mouse_down_event.x, event.mouse_down_event.y)
self.mouse_previous = self.mouse_at_start
if self.selected_tool in [Tool.curve, Tool.polygon]:
self.tool_points.append(Offset(event.mouse_down_event.x, event.mouse_down_event.y))
@ -2213,7 +2214,7 @@ class PaintApp(App[None]):
self.undos.append(action)
if self.selected_tool in [Tool.pencil, Tool.brush, Tool.eraser, Tool.airbrush]:
for x, y in bresenham_walk(mm.x - mm.delta_x, mm.y - mm.delta_y, mm.x, mm.y):
for x, y in bresenham_walk(self.mouse_previous.x, self.mouse_previous.y, mm.x, mm.y):
affected_region = self.stamp_brush(x, y, affected_region)
elif self.selected_tool == Tool.line:
for x, y in bresenham_walk(self.mouse_at_start.x, self.mouse_at_start.y, mm.x, mm.y):
@ -2271,6 +2272,8 @@ class PaintApp(App[None]):
if replace_action:
affected_region = affected_region.union(old_action.region)
self.canvas.refresh_scaled_region(affected_region)
self.mouse_previous = mm.offset
def on_canvas_tool_stop(self, event: Canvas.ToolStop) -> None:
"""Called when releasing the mouse button after drawing/dragging on the canvas."""