feat: 绘制Header和Legend

miniprogram/canvasService/utils.ts

@@ -0,0 +1,17 @@
+import { PAPER_SIZE } from './constant';
+
+export function setCanvasSize(canvas: Canvas, paperSize: PaperSize) {
+    const sizeObj = PAPER_SIZE[paperSize];
+    // const { pixelRatio: dpr, windowWidth, windowHeight } = wx.getWindowInfo();
+    // const printWidth = A4.width;
+    // const printHeight = A4.height;
+    // @ts-ignore
+    // const originWidth = canvas._width || windowWidth;
+    // // @ts-ignore
+    // const originHeight = canvas._height || windowHeight;
+
+    canvas.width = sizeObj.width;
+    canvas.height = sizeObj.height;
+    console.log('canvas----:', canvas);
+    return canvas;
+}