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並前往https://openlayers.org/en/latest/examples/canvas-gradient-pattern.html

Styling feature with CanvasGradient or CanvasPattern

getContext('2d'); // Gradient and pattern are in canvas pixel space, so we adjust for the // renderer's ... fillStyle = 'rgba(102, 0, 102, 0.5)'; context.

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查詢 「fillStyle canvas」的人也找了：

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