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Implement Free-Form Select tool

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Isaiah Odhner 2023-04-22 22:49:58 -04:00
parent 42fdbe83d7
commit 74dceee2f3
2 changed files with 72 additions and 22 deletions
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2
README.md
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@ -26,7 +26,7 @@ This is a TUI (Text User Interface) image editor, inspired by MS Paint, built wi
- [x] ANSI (.ans)
- Note that while it can load the files that it saves, you may have limited success loading other ANSI files that you find. ANSI files can vary a lot and even encode animations!
- Tools
- [ ] Free-Form Select
- [x] Free-Form Select
- [x] Select
- [x] Eraser
- [ ] Color Eraser

92
paint.py
View File

@ -400,6 +400,8 @@ class Selection:
"""The start position of the text selection within the text box. This may be before or after the end."""""
self.text_selection_end = Offset(0, 0)
"""The end position of the text selection within the text box. This may be before or after the start."""""
self.mask: Optional[list[list[bool]]] = None
"""A mask of the selection to cut out, used for Free-Form Select tool. Coordinates are relative to the selection region."""
def copy_from_document(self, document: 'AnsiArtDocument') -> None:
"""Copy the image data from the document into the selection."""
@ -412,7 +414,7 @@ class Selection:
# raise ValueError("Selection has no image data.")
return
target_region = self.region.intersection(Region(0, 0, document.width, document.height))
document.copy_region(source=self.contained_image, target_region=target_region)
document.copy_region(source=self.contained_image, target_region=target_region, mask=self.mask)
debug_region_updates = False
@ -431,7 +433,7 @@ class AnsiArtDocument:
self.fg = [["#000000" for _ in range(width)] for _ in range(height)]
self.selection: Optional[Selection] = None
def copy_region(self, source: 'AnsiArtDocument', source_region: Region|None = None, target_region: Region|None = None):
def copy_region(self, source: 'AnsiArtDocument', source_region: Region|None = None, target_region: Region|None = None, mask: list[list[bool]]|None = None) -> None:
if source_region is None:
source_region = Region(0, 0, source.width, source.height)
if target_region is None:
@ -443,7 +445,7 @@ class AnsiArtDocument:
random_color = "rgb(" + str(randint(0, 255)) + "," + str(randint(0, 255)) + "," + str(randint(0, 255)) + ")"
for y in range(target_region.height):
for x in range(target_region.width):
if source_region.contains(x + source_offset.x, y + source_offset.y):
if source_region.contains(x + source_offset.x, y + source_offset.y) and (mask is None or mask[y][x]):
self.ch[y + target_offset.y][x + target_offset.x] = source.ch[y + source_offset.y][x + source_offset.x]
self.bg[y + target_offset.y][x + target_offset.x] = source.bg[y + source_offset.y][x + source_offset.x]
self.fg[y + target_offset.y][x + target_offset.x] = source.fg[y + source_offset.y][x + source_offset.x]
@ -635,6 +637,39 @@ def polyline_walk(points: List[Offset]) -> Iterator[Tuple[int, int]]:
points[i + 1][1]
)
def is_inside_polygon(x: int, y: int, points: List[Offset]) -> bool:
"""Returns True if the point is inside the polygon."""
# https://stackoverflow.com/a/217578
n = len(points)
inside = False
p1x, p1y = points[0]
for i in range(n + 1):
p2x, p2y = points[i % n]
if y > min(p1y, p2y):
if y <= max(p1y, p2y):
if x <= max(p1x, p2x):
if p1y != p2y:
xinters = (y - p1y) * (p2x - p1x) / (p2y - p1y) + p1x
if p1x == p2x or x <= xinters:
inside = not inside
p1x, p1y = p2x, p2y
return inside
# def polygon_fill(points: List[Offset]) -> Iterator[Tuple[int, int]]:
# """Yields points inside a polygon."""
# # Find the bounding box
# min_x = min(points, key=lambda p: p[0])[0]
# min_y = min(points, key=lambda p: p[1])[1]
# max_x = max(points, key=lambda p: p[0])[0]
# max_y = max(points, key=lambda p: p[1])[1]
# # Check each point in the bounding box, and yield any points that are inside the polygon
# for x in range(min_x, max_x + 1):
# for y in range(min_y, max_y + 1):
# if is_inside_polygon(x, y, points):
# yield x, y
# adapted from https://github.com/Pomax/bezierjs
def compute_bezier(t: float, start_x: float, start_y: float, control_1_x: float, control_1_y: float, control_2_x: float, control_2_y: float, end_x: float, end_y: float):
mt = 1 - t
@ -934,7 +969,7 @@ class Canvas(Widget):
cell_x = x // self.magnification
cell_y = y // self.magnification
try:
if sel and sel.contained_image and sel.region.contains(cell_x, cell_y):
if sel and sel.contained_image and sel.region.contains(cell_x, cell_y) and (sel.mask is None or sel.mask[cell_y - sel.region.y][cell_x - sel.region.x]):
bg = sel.contained_image.bg[cell_y - sel.region.y][cell_x - sel.region.x]
fg = sel.contained_image.fg[cell_y - sel.region.y][cell_x - sel.region.x]
ch = sel.contained_image.ch[cell_y - sel.region.y][cell_x - sel.region.x]
@ -1179,7 +1214,7 @@ class PaintApp(App[None]):
self.image.bg[y][x] = bg_color
self.image.fg[y][x] = fg_color
def erase_region(self, region: Region) -> None:
def erase_region(self, region: Region, mask: Optional[list[list[bool]]] = None) -> None:
# Time to go undercover as an eraser. 🥸
# TODO: just add a parameter to stamp_char.
# Momentarily masquerading makes me mildly mad.
@ -1187,7 +1222,8 @@ class PaintApp(App[None]):
self.selected_tool = Tool.eraser
for x in range(region.width):
for y in range(region.height):
self.stamp_char(x + region.x, y + region.y)
if mask is None or mask[y][x]:
self.stamp_char(x + region.x, y + region.y)
self.selected_tool = original_tool
def draw_current_polyline(self) -> Region:
@ -1803,10 +1839,6 @@ class PaintApp(App[None]):
self.magnifier_click(event.mouse_down_event.x, event.mouse_down_event.y)
return
if self.selected_tool in [Tool.free_form_select]:
self.selected_tool = Tool.pencil
# TODO: support the last tool
# TODO: use Offset() instead of tuple
# and I would say use event.offset, but I'm dynamically
# modifying x/y in fix_mouse_event so I need to use those coords for now,
@ -1821,7 +1853,10 @@ class PaintApp(App[None]):
self.make_preview(self.draw_current_polyline) # polyline until finished
return
if self.selected_tool in [Tool.select, Tool.text]:
if self.selected_tool == Tool.free_form_select:
self.tool_points = [Offset(event.mouse_down_event.x, event.mouse_down_event.y)]
if self.selected_tool in [Tool.select, Tool.free_form_select, Tool.text]:
sel = self.image.selection
if sel and sel.region.contains_point(self.mouse_at_start):
if self.selected_tool == Tool.text:
@ -1848,7 +1883,7 @@ class PaintApp(App[None]):
self.redos = []
self.undos.append(action)
sel.copy_from_document(self.image)
self.erase_region(sel.region)
self.erase_region(sel.region, sel.mask)
# TODO: use two regions, for the cut out and the paste in, once melded.
# I could maybe give Action a sub_action property, and use it for the melding.
# Or I could make it use a list of regions.
@ -1994,14 +2029,18 @@ class PaintApp(App[None]):
region = self.image.selection.region
if not self.image.selection.contained_image:
# It hasn't been cut out yet, so we need to erase it.
self.erase_region(region)
self.erase_region(region, self.image.selection.mask)
self.image.selection = None
self.canvas.refresh_scaled_region(region)
self.selection_drag_offset = None
self.selecting_text = False
def on_canvas_tool_update(self, event: Canvas.ToolUpdate) -> None:
"""Called when the user is drawing on the canvas."""
"""Called when the user is drawing on the canvas.
Several tools do a preview of sorts here, even though it's not the ToolPreviewUpdate event.
TODO: rename these events to describe when they occur, ascribe less semantics to them.
"""
event.stop()
self.cancel_preview()
@ -2012,7 +2051,7 @@ class PaintApp(App[None]):
if self.selected_tool in [Tool.fill, Tool.magnifier]:
return
if self.selected_tool in [Tool.select, Tool.text]:
if self.selected_tool in [Tool.select, Tool.free_form_select, Tool.text]:
sel = self.image.selection
if self.selecting_text:
assert sel is not None, "selecting_text should only be set if there's a selection"
@ -2028,11 +2067,11 @@ class PaintApp(App[None]):
sel.region = Region.from_offset(offset, sel.region.size)
combined_region = old_region.union(sel.region)
self.canvas.refresh_scaled_region(combined_region)
elif self.selected_tool == Tool.free_form_select:
self.tool_points.append(Offset(event.mouse_move_event.x, event.mouse_move_event.y))
# polyline until finished, TODO: invert background, don't use selected color
self.make_preview(self.draw_current_polyline)
else:
# This is a tool preview, but it's not in the ToolPreviewUpdate event.
# Goes to show how the canvas's event names are silly.
# I should've just named them for what they are (i.e. when they occur)
# rather than what they mean (what they're meant to represent).
self.canvas.select_preview_region = self.get_select_region(self.mouse_at_start, event.mouse_move_event.offset)
self.canvas.refresh_scaled_region(self.canvas.select_preview_region)
return
@ -2143,9 +2182,17 @@ class PaintApp(App[None]):
# Done selecting text
self.selecting_text = False
return
if self.selected_tool in [Tool.select, Tool.text] and self.mouse_at_start:
if self.selected_tool in [Tool.select, Tool.free_form_select, Tool.text] and self.mouse_at_start:
# Finish making a selection
select_region = self.get_select_region(self.mouse_at_start, event.mouse_up_event.offset)
if self.selected_tool == Tool.free_form_select:
# Find bounds of the polygon
min_x = min(p.x for p in self.tool_points)
max_x = max(p.x for p in self.tool_points)
min_y = min(p.y for p in self.tool_points)
max_y = max(p.y for p in self.tool_points)
select_region = Region(min_x, min_y, max_x - min_x + 1, max_y - min_y + 1)
else:
select_region = self.get_select_region(self.mouse_at_start, event.mouse_up_event.offset)
if self.image.selection:
# This shouldn't happen, because it should meld
# the selection on mouse down.
@ -2154,6 +2201,9 @@ class PaintApp(App[None]):
self.image.selection.textbox_mode = self.selected_tool == Tool.text
if self.image.selection.textbox_mode:
self.image.selection.contained_image = AnsiArtDocument(self.image.selection.region.width, self.image.selection.region.height)
if self.selected_tool == Tool.free_form_select:
# Define the mask for the selection using the polygon
self.image.selection.mask = [[is_inside_polygon(x + select_region.x, y + select_region.y, self.tool_points) for x in range(select_region.width)] for y in range(select_region.height)]
self.canvas.refresh_scaled_region(select_region)
elif self.selected_tool == Tool.curve:
# Maybe finish drawing a curve