Question

我想基于如何在所选点之间绘制线来上传图像，并且我想捕获该特定图像所以请建议如何用html5写

Answer 1

您可以绘制路径，在画布上给出某些点（或点）以在它们之间绘制一条线。然后你可以划线（实际上画线到画布）。

var canvas = document.body.appendChild(document.createElement("CANVAS")), context = canvas.getContext("2d");

context.beginPath();
  // all points are given as x (from left to right), y (from top to bottom)
  context.moveTo(10, 20); // x = 10 (10 px from the left edge of the canvas), y = 20 (20 px from the top edge of the canvas)
  context.lineTo(100, 97); // x = 100, y = 97
  context.lineTo(50, 105); // x = 50, y = 100

context.stroke();

[MDN]

Html Canvas使用点画线

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