Python script, ASCII text executable
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from pyscript import document
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from pyodide.ffi import create_proxy
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from pyodide.http import pyfetch
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import asyncio
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document.getElementById("shape-options").style.display = "flex"
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image = document.getElementById("annotation-image")
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zone = document.getElementById("annotation-zone")
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confirm_button = document.getElementById("annotation-confirm")
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cancel_button = document.getElementById("annotation-cancel")
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backspace_button = document.getElementById("annotation-backspace")
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delete_button = document.getElementById("annotation-delete")
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previous_button = document.getElementById("annotation-previous")
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next_button = document.getElementById("annotation-next")
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object_list = document.getElementById("object-types")
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confirm_button.style.display = "none"
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cancel_button.style.display = "none"
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backspace_button.style.display = "none"
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delete_button.style.display = "none"
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previous_button.style.display = "none"
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next_button.style.display = "none"
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shape_type = ""
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bbox_pos = None
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new_shape = None
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selected_shape = None
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async def get_all_objects():
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response = await pyfetch("/api/object-types")
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if response.ok:
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return await response.json()
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def follow_cursor(event):
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rect = zone.getBoundingClientRect()
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x = event.clientX - rect.left
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y = event.clientY - rect.top
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vertical_ruler.style.left = str(x) + "px"
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horizontal_ruler.style.top = str(y) + "px"
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def change_object_type(event):
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global selected_shape
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if selected_shape is None:
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return
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selected_shape.setAttribute("data-object-type", event.currentTarget.value)
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change_object_type_proxy = create_proxy(change_object_type)
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async def focus_shape(shape):
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global selected_shape
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if shape_type != "select":
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return
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if selected_shape is not None:
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selected_shape.classList.remove("selected")
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selected_shape = shape
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selected_shape.classList.add("selected")
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objects = await get_all_objects()
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delete_button.style.display = "block"
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next_button.style.display = "block"
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previous_button.style.display = "block"
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object_list.innerHTML = ""
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new_radio = document.createElement("input")
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new_radio.setAttribute("type", "radio")
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new_radio.setAttribute("name", "object-type")
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new_radio.setAttribute("value", "")
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new_label = document.createElement("label")
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new_label.appendChild(new_radio)
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new_label.append("Undefined")
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object_list.appendChild(new_label)
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new_radio.addEventListener("change", change_object_type_proxy)
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selected_object = selected_shape.getAttribute("data-object-type")
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if not selected_object:
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new_radio.setAttribute("checked", "")
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for object, description in objects.items():
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new_radio = document.createElement("input")
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new_radio.setAttribute("type", "radio")
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new_radio.setAttribute("name", "object-type")
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new_radio.setAttribute("value", object)
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if selected_object == object:
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new_radio.setAttribute("checked", "")
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new_label = document.createElement("label")
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new_label.appendChild(new_radio)
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new_label.append(object)
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object_list.appendChild(new_label)
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new_radio.addEventListener("change", change_object_type_proxy)
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async def select_shape(event):
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await focus_shape(event.target)
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async def next_shape(event):
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global selected_shape
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if selected_shape is None:
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return
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selected_svg = selected_shape.parentNode
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while selected_svg is not None:
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next_sibling = selected_svg.nextElementSibling
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if next_sibling and next_sibling.classList.contains("shape-container"):
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selected_svg = next_sibling
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break
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elif next_sibling is None:
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# If no more siblings, loop back to the first child
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selected_svg = selected_svg.parentNode.firstElementChild
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while selected_svg is not None and not selected_svg.classList.contains(
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"shape-container"):
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selected_svg = selected_svg.nextElementSibling
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break
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else:
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selected_svg = next_sibling
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if selected_svg:
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shape = selected_svg.firstElementChild
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await focus_shape(shape)
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async def previous_shape(event):
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global selected_shape
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if selected_shape is None:
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return
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selected_svg = selected_shape.parentNode
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while selected_svg is not None:
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next_sibling = selected_svg.previousElementSibling
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if next_sibling and next_sibling.classList.contains("shape-container"):
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selected_svg = next_sibling
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break
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elif next_sibling is None:
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# If no more siblings, loop back to the last child
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selected_svg = selected_svg.parentNode.lastElementChild
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while selected_svg is not None and not selected_svg.classList.contains(
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"shape-container"):
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selected_svg = selected_svg.previousElementSibling
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break
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else:
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selected_svg = next_sibling
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if selected_svg:
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shape = selected_svg.firstElementChild
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await focus_shape(shape)
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def unselect_shape(event):
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global selected_shape
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if selected_shape is not None:
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selected_shape.classList.remove("selected")
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selected_shape = None
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object_list.innerHTML = ""
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delete_button.style.display = "none"
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next_button.style.display = "none"
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previous_button.style.display = "none"
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def delete_shape(event):
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global selected_shape
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if selected_shape is None:
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return
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# Shape is SVG shape inside SVG so we need to remove the parent SVG
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selected_shape.parentNode.remove()
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selected_shape = None
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object_list.innerHTML = ""
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delete_button.style.display = "none"
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next_button.style.display = "none"
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previous_button.style.display = "none"
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select_shape_proxy = create_proxy(select_shape)
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unselect_shape_proxy = create_proxy(unselect_shape)
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delete_shape_proxy = create_proxy(delete_shape)
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next_shape_proxy = create_proxy(next_shape)
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previous_shape_proxy = create_proxy(previous_shape)
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delete_button.addEventListener("click", delete_shape_proxy)
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next_button.addEventListener("click", next_shape_proxy)
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previous_button.addEventListener("click", previous_shape_proxy)
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# These are functions usable in JS
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cancel_bbox_proxy = create_proxy(lambda event: cancel_bbox(event))
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make_bbox_proxy = create_proxy(lambda event: make_bbox(event))
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make_polygon_proxy = create_proxy(lambda event: make_polygon(event))
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follow_cursor_proxy = create_proxy(follow_cursor)
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def switch_shape(event):
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global shape_type
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object_list.innerHTML = ""
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unselect_shape(None)
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shape = event.currentTarget.id
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shape_type = shape
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if shape_type == "select":
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# Add event listeners to existing shapes
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print(len(list(document.getElementsByClassName("shape"))), "shapes found")
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for shape in document.getElementsByClassName("shape"):
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print("Adding event listener to shape:", shape)
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shape.addEventListener("click", select_shape_proxy)
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image.addEventListener("click", unselect_shape_proxy)
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helper_message.innerText = "Click on a shape to select"
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# Cancel the current shape creation
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match shape_type:
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case "shape-bbox":
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cancel_bbox(None)
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case "shape-polygon":
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cancel_polygon(None)
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else:
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# Remove event listeners for selection
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for shape in document.getElementsByClassName("shape"):
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print("Removing event listener from shape:", shape)
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shape.removeEventListener("click", select_shape_proxy)
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image.removeEventListener("click", unselect_shape_proxy)
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helper_message.innerText = "Select a shape type then click on the image to begin defining it"
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print("Shape is now of type:", shape)
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vertical_ruler = document.getElementById("annotation-ruler-vertical")
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horizontal_ruler = document.getElementById("annotation-ruler-horizontal")
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vertical_ruler_2 = document.getElementById("annotation-ruler-vertical-secondary")
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horizontal_ruler_2 = document.getElementById("annotation-ruler-horizontal-secondary")
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helper_message = document.getElementById("annotation-helper-message")
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helper_message.innerText = "Select a shape type then click on the image to begin defining it"
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def cancel_bbox(event):
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global bbox_pos, new_shape
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# Key must be ESCAPE
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if event is not None and hasattr(event, "key") and event.key != "Escape":
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return
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if new_shape is not None and event is not None:
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# Require event so the shape is kept when it ends normally
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new_shape.remove()
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zone.removeEventListener("click", make_bbox_proxy)
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document.removeEventListener("keydown", cancel_bbox_proxy)
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cancel_button.removeEventListener("click", cancel_bbox_proxy)
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bbox_pos = None
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vertical_ruler.style.display = "none"
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horizontal_ruler.style.display = "none"
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vertical_ruler_2.style.display = "none"
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horizontal_ruler_2.style.display = "none"
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zone.style.cursor = "auto"
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cancel_button.style.display = "none"
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helper_message.innerText = "Select a shape type then click on the image to begin defining it"
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new_shape = None
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def make_bbox(event):
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global new_shape, bbox_pos
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zone_rect = zone.getBoundingClientRect()
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if bbox_pos is None:
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helper_message.innerText = "Now define the second point"
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bbox_pos = [(event.clientX - zone_rect.left) / zone_rect.width,
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(event.clientY - zone_rect.top) / zone_rect.height]
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vertical_ruler_2.style.left = str(bbox_pos[0] * 100) + "%"
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horizontal_ruler_2.style.top = str(bbox_pos[1] * 100) + "%"
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vertical_ruler_2.style.display = "block"
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horizontal_ruler_2.style.display = "block"
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else:
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x0, y0 = bbox_pos.copy()
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x1 = (event.clientX - zone_rect.left) / zone_rect.width
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y1 = (event.clientY - zone_rect.top) / zone_rect.height
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rectangle = document.createElementNS("http://www.w3.org/2000/svg", "rect")
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new_shape = document.createElementNS("http://www.w3.org/2000/svg", "svg")
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new_shape.setAttribute("width", "100%")
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new_shape.setAttribute("height", "100%")
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zone_rect = zone.getBoundingClientRect()
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new_shape.setAttribute("viewBox", f"0 0 {image.naturalWidth} {image.naturalHeight}")
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new_shape.classList.add("shape-container")
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new_shape.appendChild(rectangle)
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zone.appendChild(new_shape)
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minx = min(x0, x1)
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miny = min(y0, y1)
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maxx = max(x0, x1)
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maxy = max(y0, y1)
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rectangle.setAttribute("x", str(minx * image.naturalWidth))
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rectangle.setAttribute("y", str(miny * image.naturalHeight))
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rectangle.setAttribute("width", str((maxx - minx) * image.naturalWidth))
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rectangle.setAttribute("height", str((maxy - miny) * image.naturalHeight))
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rectangle.setAttribute("fill", "none")
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rectangle.setAttribute("data-object-type", "")
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rectangle.classList.add("shape-bbox")
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rectangle.classList.add("shape")
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# Add event listeners to the new shape
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rectangle.addEventListener("click", select_shape_proxy)
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cancel_bbox(None)
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polygon_points = []
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def make_polygon(event):
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global new_shape, polygon_points
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polygon = new_shape.children[0]
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zone_rect = zone.getBoundingClientRect()
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polygon_points.append(((event.clientX - zone_rect.left) / zone_rect.width,
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(event.clientY - zone_rect.top) / zone_rect.height))
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# Update the polygon
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polygon.setAttribute("points", " ".join(
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[f"{point[0] * image.naturalWidth},{point[1] * image.naturalHeight}" for point in
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polygon_points]))
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def reset_polygon():
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global new_shape, polygon_points
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zone.removeEventListener("click", make_polygon_proxy)
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document.removeEventListener("keydown", close_polygon_proxy)
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document.removeEventListener("keydown", cancel_polygon_proxy)
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document.removeEventListener("keydown", backspace_polygon_proxy)
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confirm_button.style.display = "none"
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cancel_button.style.display = "none"
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backspace_button.style.display = "none"
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confirm_button.removeEventListener("click", close_polygon_proxy)
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cancel_button.removeEventListener("click", cancel_polygon_proxy)
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backspace_button.removeEventListener("click", backspace_polygon_proxy)
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polygon_points.clear()
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zone.style.cursor = "auto"
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new_shape = None
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def close_polygon(event):
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if event is not None and hasattr(event, "key") and event.key != "Enter":
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return
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# Polygon is already there, but we need to remove the events
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reset_polygon()
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def cancel_polygon(event):
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if event is not None and hasattr(event, "key") and event.key != "Escape":
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return
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# Delete the polygon
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new_shape.remove()
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reset_polygon()
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def backspace_polygon(event):
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if event is not None and hasattr(event, "key") and event.key != "Backspace":
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return
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if not polygon_points:
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return
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polygon_points.pop()
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polygon = new_shape.children[0]
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polygon.setAttribute("points", " ".join(
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[f"{point[0] * image.naturalWidth},{point[1] * image.naturalHeight}" for point in
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polygon_points]))
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close_polygon_proxy = create_proxy(close_polygon)
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cancel_polygon_proxy = create_proxy(cancel_polygon)
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backspace_polygon_proxy = create_proxy(backspace_polygon)
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def open_shape(event):
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global new_shape, bbox_pos
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if bbox_pos or shape_type == "select":
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return
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print("Creating a new shape of type:", shape_type)
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if shape_type == "shape-bbox":
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helper_message.innerText = ("Define the first point at the intersection of the lines "
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"by clicking on the image, or click the cross to cancel")
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cancel_button.addEventListener("click", cancel_bbox_proxy)
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document.addEventListener("keydown", cancel_bbox_proxy)
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cancel_button.style.display = "block"
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bbox_pos = None
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zone.addEventListener("click", make_bbox_proxy)
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vertical_ruler.style.display = "block"
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horizontal_ruler.style.display = "block"
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zone.style.cursor = "crosshair"
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elif shape_type == "shape-polygon" or shape_type == "shape-polyline":
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match shape_type:
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case "shape-polygon":
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helper_message.innerText = ("Click on the image to define the points of the polygon, "
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"press escape to cancel, enter to close, or backspace to "
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"remove the last point")
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case "shape-polyline":
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helper_message.innerText = ("Click on the image to define the points of the polyline, "
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"press escape to cancel, enter to finish, or backspace to "
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"remove the last point")
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if not polygon_points and not new_shape:
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new_shape = document.createElementNS("http://www.w3.org/2000/svg", "svg")
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new_shape.setAttribute("width", "100%")
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new_shape.setAttribute("height", "100%")
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zone_rect = zone.getBoundingClientRect()
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new_shape.setAttribute("viewBox", f"0 0 {image.naturalWidth} {image.naturalHeight}")
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new_shape.classList.add("shape-container")
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if not polygon_points and int(len(new_shape.children)) == 0:
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zone.addEventListener("click", make_polygon_proxy)
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document.addEventListener("keydown", close_polygon_proxy)
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document.addEventListener("keydown", cancel_polygon_proxy)
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document.addEventListener("keydown", backspace_polygon_proxy)
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cancel_button.addEventListener("click", cancel_polygon_proxy)
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cancel_button.style.display = "block"
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confirm_button.addEventListener("click", close_polygon_proxy)
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confirm_button.style.display = "block"
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backspace_button.addEventListener("click", backspace_polygon_proxy)
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backspace_button.style.display = "block"
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match shape_type:
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case "shape-polygon":
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polygon = document.createElementNS("http://www.w3.org/2000/svg", "polygon")
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polygon.classList.add("shape-polygon")
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case "shape-polyline":
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polygon = document.createElementNS("http://www.w3.org/2000/svg", "polyline")
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polygon.classList.add("shape-polyline")
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polygon.setAttribute("fill", "none")
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polygon.setAttribute("data-object-type", "")
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polygon.classList.add("shape")
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new_shape.appendChild(polygon)
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zone.appendChild(new_shape)
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zone.style.cursor = "crosshair"
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for button in list(document.getElementById("shape-selector").children):
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button.addEventListener("click", create_proxy(switch_shape))
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print("Shape", button.id, "is available")
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zone.addEventListener("mousemove", follow_cursor_proxy)
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zone.addEventListener("click", create_proxy(open_shape))
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