LineDrawer¶

LineDrawer is a SketchDataset loader for the LineDrawer dataset, where the sequential drawing process of high-quality anime line arts is stored as .json files. The loader extracts coordinate points and dynamic point-level thickness, converting them into a Sketch composed of Paths and cubic Bézier Curves. The canvas dimensions are dynamically calculated based on the bounding box of the strokes to ensure no clipping occurs.

Source: datasets/linedrawer.py

Data Format¶

Each sample is a JSON array of strokes, where each stroke contains a sequence of points with the following attributes:

x: x-coordinate (float)
y: y-coordinate (float)
w: local stroke thickness/width at the current point (float)
t: time stamp

The loader groups these points into strokes and converts each consecutive point pair into a cubic Bézier curve, applying the w attribute to the thickness of the corresponding Point.

Directory Layout¶

After download and extraction, the dataset is expected under:

<root>/
  LineDrawer/
    json/
      00000.json
      00001.json
      ...

Each .json file in the json/ directory corresponds to a single sketch.

Code¶

from sketchkit.datasets import LineDrawer

ds = LineDrawer(cislab_source=True)

sketch = ds[0]
print(sketch.width, sketch.height)
print(sketch.path_num, sketch.curve_num)

Arguments

cislab_source: Selects the download source. If True, the dataset is downloaded from the CISLAB CDN mirror; otherwise it is downloaded from official host.
- CISLAB mirror : https://cislab.hkust-gz.edu.cn/projects/sketchkit/datasets/LineDrawer/sketch.zip
- Official host: https://cislab.hkust-gz.edu.cn/projects/linedrawer/datasets/sketch.zip