def image_from_canvas(self, pos: CanvasPos) -> ImagePixelCoordinate:
fip = FractionalImagePos.from_CanvasPos(pos, self.image.transform)
img = self.image.image
img_size = (1, 1)
if img:
img_size = (img.width, img.height)
ip = ImagePixelCoordinate.from_FractionalImagePos(fip, img_size)
return ip
def size(self) -> ImagePixelCoordinate:
cp1 = CanvasPos(self.left, self.top)
cp2 = CanvasPos(self.right, self.bottom)
xform = self.images[0].transform
img_size = self.images[0].size()
fips = [
FractionalImagePos.from_CanvasPos(pos, xform) for pos in (cp1, cp2)
]
ipcs = [
ImagePixelCoordinate.from_FractionalImagePos(pos, img_size)
for pos in fips
]
width = int(round(abs(ipcs[1].x - ipcs[0].x)) + 0.1)
height = int(round(abs(ipcs[1].y - ipcs[0].y)) + 0.1)
return ImagePixelCoordinate(width, height)
def recenter(self):
center_x = 0.5 * (self.right + self.left)
center_y = 0.5 * (self.bottom + self.top)
if center_x == 0 and center_y == 0:
return
self._dirty = True
# 1) change clip box
self.right -= center_x
self.left = -self.right
self.top -= center_y
self.bottom = -self.top
# 2) change camera(s)
dcp = CanvasPos(center_x, center_y)
self.camera.center -= CanvasPos(center_x, center_y)
# 3) change image center(s)
for img in self.images:
fpc = img.transform.center
cpc = CanvasPos.from_FractionalImagePos(fpc, img.transform)
cpc += dcp
fpc = FractionalImagePos.from_CanvasPos(cpc, img.transform)
img.transform.center = fpc
def x_fract_from_canvas(self, pos: CanvasPos) -> FractionalImagePos:
return FractionalImagePos.from_CanvasPos(pos, self.image.transform)