https://en.wikipedia.org/wiki/Rasterisation https://msdn.microsoft.com/ja-jp/library/ee415722(v=vs.85).aspx VectorGraphics グラデーション (Gradient) 直線† DDA (DigitalDifferentialAnalyzer) https://ja.wikipedia.org/wiki/ブレゼンハムのアルゴリズム https://xlinux.nist.gov/dads/HTML/bresenham.html https://www.cs.helsinki.fi/group/goa/mallinnus/lines/bresenh.html Xiaolin Wu's line algorithm https://en.wikipedia.org/wiki/Xiaolin_Wu%27s_line_algorithm ↑円† Circle ↑その他† Dither Link: VectorGraphics Gradient DigitalDifferentialAnalyzer Circle Dither