Метод createLinearGradient
Реализация
CanvasGradient createLinearGradient(num x0, num y0, num x1, num y1) native;
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Licensed under the BSD 3-Clause "New" or "Revised" License.
https://api.dart.dev/stable/2.18.5/dart-html/CanvasRenderingContext2D/createLinearGradient.html
