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白板信息保存0k问题修改 #13

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merged 2 commits into from
Jul 5, 2024
Merged

白板信息保存0k问题修改 #13

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eacc0b3
白板信息保存0k问题修改
Loren-Wang Jul 5, 2024
46addca
修改默认canvas生成宽高问题
Loren-Wang Jul 5, 2024
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20 changes: 18 additions & 2 deletions src/common/whiteboard-wrapper/utils.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -137,14 +137,17 @@ export const mergeCanvasImage = async (scenes: (() => Promise<HTMLCanvasElement
const canvasArray = [];

for (const canvasPromise of scenes) {
const canvas = await canvasPromise();

let canvas = await canvasPromise();
if("data:," === canvas?.toDataURL()){
canvas = getDefaultCanvas()
}
if (canvas) {
width = Math.max(canvas.width, width);
height = Math.max(canvas.height, height);
canvasArray.push(canvas);
}
}

bigCanvas.setAttribute('width', `${width}`);
bigCanvas.setAttribute('height', `${height * canvasArray.length}`);

Expand All @@ -154,3 +157,16 @@ export const mergeCanvasImage = async (scenes: (() => Promise<HTMLCanvasElement

return bigCanvas;
};

function getDefaultCanvas():HTMLCanvasElement{
// 创建新的 canvas 元素
const canvas = document.createElement('canvas');
// 设置 canvas 尺寸为图像尺寸
canvas.width = 100;
canvas.height = 100;
const ctx = canvas.getContext('2d')!;
// 设置填充颜色为白色，并填充整个 canvas
ctx.fillStyle = 'white';
ctx.fillRect(0, 0, canvas.width, canvas.height);
return canvas;
}