為什么Chrome上的畫布會突出顯示Path2D邊緣？

Question

我一直致力於在html5畫布上制作漂亮的分層透明圖形，並且遇到了令人煩惱的Chrome唯一錯誤。 它突出顯示每個圖形的線條部分的邊緣，從而創建丑陋的垂直線條。 見下圖：

繪制這些行的代碼是：

var graphs = // [[points...],[points...],...]
var canvas = document.getElementById('canvas');
var ctx = canvas.getContext('2d');
canvas.width = 926;
canvas.height = 418;

ctx.lineWidth = 1;
ctx.strokeStyle = "rgba(155,155,255, .3)"

for(var j = 0; j < graphs.length; j++) {
  var graph = graphs[j]

  var path = new Path2D()

  for(var i = 0; i < graph.length; i = i + 2) {
    // i = x, i+1 = y
    if(i === 0) 
      path.moveTo(graph[i], graph[i+1])
    else 
      path.lineTo(graph[i], graph[i+1])
  }

  ctx.stroke(path);  
}

Codepen： 見工作示例

它適用於Firefox，Safari，Edge。 在Mac和Windows上都無法在Chrome上運行。

知道是什么導致這???

Answer 1

確實有趣的錯誤，您可能想在他們的錯誤跟蹤器上打開一個問題。

要解決此問題，您可以稍微將lineWidth更改為1.1，並且抗鋸齒錯誤將會消失：

 function draw(graphs) { var canvas = document.getElementById('canvas'); var ctx = canvas.getContext('2d'); canvas.width = 926; canvas.height = 418; ctx.lineWidth = 1.1; ctx.strokeStyle = "rgba(155,155,255, .3)" for (var j = 0; j < graphs.length; j++) { var graph = graphs[j] var path = new Path2D() for (var i = 0; i < graph.length; i = i + 2) { // i = x, i+1 = y if (i === 0) path.moveTo(graph[i], graph[i + 1]) else path.lineTo(graph[i], graph[i + 1]) } ctx.stroke(path); } } //reduced the dataset so it can fit in the answer 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Answer 2

這是由於使用浮點坐標引起的， MDN建議避免使用它 ，可以通過使用浮點數線寬來緩解問題， ctx.lineWidth = 1.5; 。