CanvasRenderingContext2D.shadowOffsetY | Canvas CanvasRenderingContext2D

CanvasRenderingContext2D.shadowOffsetY 是 Canvas 2D API 描述阴影垂直偏移距离的属性。

语法

ctx.shadowOffsetY = offset;

offset

阴影垂直偏移距离的 float 类型的值。默认值是 0。 Infinity 或者NaN 都会被忽略。

示例

使用 `shadowOffsetY` 属性

这是一段简单的代码片段，使用 shadowOffsetY 属性绘制阴影垂直偏移量。注意：将 shadowColor 属性设置成不透明，阴影才会被绘制。

HTML

<canvas id="canvas"></canvas>

JavaScript

var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");

ctx.shadowColor = "black";
ctx.shadowOffsetY = 10;
ctx.shadowBlur = 10;

ctx.fillStyle = "green";
ctx.fillRect(10, 10, 100, 100);

修改下面的代码并在线查看 canvas 的变化：

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <meta name="robots" content="noindex, nofollow">
        <style>
            body {
              padding: 0;
              margin: 0;
            }

            svg:not(:root) {
              display: block;
            }

            .playable-code {
              background-color: #f4f7f8;
              border: none;
              border-left: 6px solid #558abb;
              border-width: medium medium medium 6px;
              color: #4d4e53;
              height: 100px;
              width: 90%;
              padding: 10px 10px 0;
            }

            .playable-canvas {
              border: 1px solid #4d4e53;
              border-radius: 2px;
            }

            .playable-buttons {
              text-align: right;
              width: 90%;
              padding: 5px 10px 5px 26px;
            }
        </style>
        
        <title>CanvasRenderingContext2D.shadowOffsetY | Web176教程www.web176.com</title>
        
    </head>
    <body>
        
            <canvas id="canvas" width="400" height="200" class="playable-canvas"></canvas>
<div class="playable-buttons">
  <input id="edit" type="button" value="Edit" />
  <input id="reset" type="button" value="Reset" />
</div>
<textarea id="code" class="playable-code">
ctx.shadowColor = "black";
ctx.shadowOffsetY = 10;
ctx.shadowBlur = 10;
ctx.fillStyle = "green";
ctx.fillRect(10, 10, 100, 100);</textarea>

        
        
            <script>
                var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");

ctx.shadowColor = "black";
ctx.shadowOffsetY = 10;
ctx.shadowBlur = 10;

ctx.fillStyle = "green";
ctx.fillRect(10, 10, 100, 100);

var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");
var textarea = document.getElementById("code");
var reset = document.getElementById("reset");
var edit = document.getElementById("edit");
var code = textarea.value;

function drawCanvas() {
  ctx.clearRect(0, 0, canvas.width, canvas.height);
  eval(textarea.value);
}

reset.addEventListener("click", function() {
  textarea.value = code;
  drawCanvas();
});

edit.addEventListener("click", function() {
  textarea.focus();
})

textarea.addEventListener("input", drawCanvas);
window.addEventListener("load", drawCanvas);

            </script>
        
    </body>
</html>

返回到：Canvas API：CanvasRenderingContext2D

作者：terry，如若转载，请注明出处：https://www.web176.com/canvas_api/8004.html

CanvasRenderingContext2D.shadowOffsetY | Canvas CanvasRenderingContext2D

语法

示例

使用 shadowOffsetY 属性

HTML

JavaScript

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使用 `shadowOffsetY` 属性