我已经生成了一个带有 x、y 坐标的 JSON 文件，以使用 Fabric JS 绘制折线。但是，我目前的问题是我使用的坐标系是图像像素，而我正在绘制的画布是 openseadragon (OSD)。因此，我需要将坐标系从图像像素更改为视口坐标。
我知道 openseadragonimageToViewportCoordinates中有一个函数可以进行转换。但是，问题是如何解析 x ， y 坐标，转换它们并在织物 js 画布上绘制折线？
JSON文件如下：
{"version":"2.0.0-beta7","objects":[
{"type":"polyline","fill":"rgba(250,0,0,0.8)","points":[
{"x":61146,"y":155098}
]},
{"type":"polyline","fill":"rgba(250,0,0,0.8)","points":[
{"x":61658,"y":154330}
]},
{"type":"polyline","fill":"rgba(250,0,0,0.8)","points":[
{"x":66778,"y":152538}
]},
{"type":"polyline","fill":"rgba(250,0,0,0.8)","points":[
{"x":67034,"y":152026}
]},
{"type":"polyline","fill":"rgba(250,0,0,0.8)","points":[
{"x":60634,"y":151002},
{"x":60378,"y":151258},
{"x":60122,"y":151258},
{"x":59866,"y":151258},
{"x":59610,"y":151258},
{"x":59354,"y":151514},
{"x":59098,"y":151514},
{"x":58842,"y":151514},
{"x":58586,"y":151770},
{"x":58330,"y":151770},
{"x":58074,"y":152026},
{"x":57818,"y":152282},
{"x":57562,"y":152282},
{"x":57306,"y":152282},
{"x":57306,"y":152538},
{"x":57050,"y":152794},
{"x":56794,"y":152794},
{"x":56538,"y":153050},
{"x":56538,"y":153306},
{"x":56794,"y":153306},
{"x":57050,"y":153306},
{"x":57306,"y":153050},
{"x":57562,"y":152794},
{"x":57818,"y":152794},
{"x":58074,"y":153050},
{"x":58330,"y":153306},
{"x":58586,"y":153562},
{"x":58842,"y":153562},
{"x":59098,"y":153562},
{"x":59354,"y":153306},
{"x":59610,"y":153562},
{"x":59866,"y":153818},
{"x":60122,"y":154074},
{"x":60378,"y":154074},
{"x":60634,"y":154074},
{"x":60890,"y":153818},
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{"x":63194,"y":154074},
{"x":63450,"y":154330},
{"x":63194,"y":154586},
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{"x":62682,"y":154842},
{"x":62426,"y":155098},
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{"x":61914,"y":155354},
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{"x":64986,"y":156378},
{"x":65242,"y":156122},
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{"x":65498,"y":155610},
{"x":65498,"y":155354},
{"x":65498,"y":155098},
{"x":65754,"y":154842},
{"x":65498,"y":154586},
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{"x":65498,"y":154074},
{"x":65242,"y":153818},
{"x":65242,"y":153562},
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{"x":64730,"y":152538},
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{"x":64218,"y":152026},
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{"x":63450,"y":151258},
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{"x":62682,"y":151002},
{"x":62426,"y":151258},
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{"x":61658,"y":151258},
{"x":61402,"y":151002},
{"x":61146,"y":151002},
{"x":60890,"y":151002}
]}]}
感谢您的帮助！