def move_to_origin(self):
size = self.original_size
self.wmin = Coordinate((-size.width / 2) + CLIP_BOUNDARY,
(-size.height / 2) + CLIP_BOUNDARY)
self.wmax = Coordinate((size.width / 2) - CLIP_BOUNDARY,
(size.height / 2) - CLIP_BOUNDARY)
self.angle = 0
self._notify()
def untransform_coordinate(self, coordinate: Coordinate) -> Coordinate:
coordinate = coordinate.rotate(self.vcenter, -self.angle)
x = coordinate.x / (self.vmax.x - self.vmin.x) * (
self.wmax.x - self.wmin.x) + self.wmin.x
y = coordinate.y / (self.vmax.y - self.vmin.y) * (
self.wmax.y - self.wmin.y) + self.wmin.y
return Coordinate(x, y)
def transform_coordinate(self, coordinate: Coordinate) -> Coordinate:
coordinate = coordinate.rotate(self.wcenter, self.angle)
x = (coordinate.x - self.wmin.x) / (self.wmax.x - self.wmin.x) * (
self.vmax.x - self.vmin.x)
y = (coordinate.y - self.wmin.y) / (self.wmax.y - self.wmin.y) * (
self.vmax.y - self.vmin.y)
return Coordinate(x, y)
def on_press_drawing_area(self, drawing_area, event):
click = Coordinate(event.x, event.y)
if self.creating_wireframe is not None:
untransformed_click = self.vp.untransform_coordinate(click)
self.creating_wireframe.append(untransformed_click)
self._refresh()
return True
def cohen_sutherland(self, c0: Coordinate, c1: Coordinate):
while True:
code0 = self._code(c0)
code1 = self._code(c1)
if (code0 | code1) == 0:
return True, c0, c1
elif (code0 & code1) != 0:
return False, None, None
else:
out = code0 if code0 != 0 else code1
x = None
y = None
if (out & TOP) != 0:
x = c0.x + (c1.x - c0.x) * (self.vmin.y - c0.y) / (c1.y -
c0.y)
y = self.vmin.y
elif (out & BOTTOM) != 0:
x = c0.x + (c1.x - c0.x) * (self.vmax.y - c0.y) / (c1.y -
c0.y)
y = self.vmax.y
elif (out & RIGHT) != 0:
x = self.vmax.x
y = c0.y + (c1.y - c0.y) * (self.vmax.x - c0.x) / (c1.x -
c0.x)
elif (out & LEFT) != 0:
x = self.vmin.x
y = c0.y + (c1.y - c0.y) * (self.vmin.x - c0.x) / (c1.x -
c0.x)
assert x is not None and y is not None
if out == code0:
c0 = Coordinate(x, y)
else:
c1 = Coordinate(x, y)
def _refresh(self):
self._refresh_list()
self._clear_surface()
pencil = Pencil(self.surface)
clipper = Clipper(self.vp.cmin, self.vp.cmax)
for wireframe in self.vp.get_grid():
clipped_wireframes = clipper.clip(wireframe)
for w in clipped_wireframes:
pencil.draw_wireframe(w)
origin = self.vp.transform_coordinate(Coordinate(0, 0))
if clipper.inside(origin):
pencil.line_width(10)
pencil.color(Color(0, 0, 0, 0.5))
pencil.draw_point(origin)
pencil.line_width(1.5)
for wireframe in self.df.wireframes:
transformed_wireframe = self.vp.transform_wireframe(wireframe)
clipped_wireframe = clipper.clip(transformed_wireframe)
for w in clipped_wireframe:
pencil.draw_wireframe(w)
if self.creating_wireframe is not None:
new_wireframe = Wireframe(
id='creating',
coordinates=self.creating_wireframe,
color=Color(1, 0, 0)
)
transformed_wireframe = self.vp.transform_wireframe(new_wireframe)
pencil.draw_wireframe(transformed_wireframe)
clipping_square = Wireframe.square(
'clipping_square',
self.vp.cmin,
self.vp.cmax,
color=Color(1, 0.5, 0),
)
pencil.draw_wireframe(clipping_square)
self.window.queue_draw()
def apply(self, df: DisplayFile, vp: Viewport):
wireframe = df[self.oid]
if wireframe is None:
raise ValueError('invalid oid')
new = None
if self.type == 'translate':
if self.x is None or self.y is None:
raise ValueError('scale')
new = wireframe.translate(Delta(self.x, self.y).rotate(-vp.angle))
if self.type == 'scale':
if self.x is None or self.y is None:
raise ValueError('scale')
new = wireframe.scale(Delta(self.x, self.y))
if self.type == 'rotate_world':
if self.theta is None:
raise ValueError('rotate_world')
new = wireframe.rotate_on_world(self.theta)
if self.type == 'rotate_coordinate':
if self.x is None or self.y is None or self.theta is None:
raise ValueError('rotate_coordinate')
new = wireframe.rotate_on_coordinate(Coordinate(self.x, self.y),
self.theta)
if self.type == 'rotate_self':
if self.theta is None:
raise ValueError('rotate_self')
new = wireframe.rotate_on_center(self.theta)
if new is not None:
df.replace(self.oid, new)
def __init__(self, size: Size, on_changed: Callable[[], None]):
self.original_size = size
self.wmin = Coordinate((-size.width / 2) + CLIP_BOUNDARY,
(-size.height / 2) + CLIP_BOUNDARY)
self.wmax = Coordinate((size.width / 2) - CLIP_BOUNDARY,
(size.height / 2) - CLIP_BOUNDARY)
self.vmin = Coordinate(0, 0)
self.vmax = Coordinate(size.width, size.height)
self.cmin = Coordinate(CLIP_BOUNDARY, CLIP_BOUNDARY)
self.cmax = Coordinate(size.width - CLIP_BOUNDARY,
size.height - CLIP_BOUNDARY)
self.angle = 0
self.on_changed = on_changed
def vcenter(self) -> Coordinate:
return Coordinate(
(self.vmin.x + self.vmax.x) / 2,
(self.vmin.y + self.vmax.y) / 2,
)