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Css Basic: stroke-dasharray

CSS Basics: stroke-dasharray

CSS, or Cascading Style Sheets, is a fundamental technology used for styling web pages. It allows developers to control the appearance of HTML elements, including their size, color, and layout. One of the lesser-known CSS properties is stroke-dasharray, which is primarily used to create dashed or dotted lines in SVG (Scalable Vector Graphics) and HTML elements.

Understanding stroke-dasharray

The stroke-dasharray property defines the pattern of dashes and gaps used to create a dashed or dotted line. It takes a list of values as its input, specifying the length of each dash and gap in the pattern. For example, stroke-dasharray: 5 2 creates a pattern with a dash of length 5 pixels followed by a gap of length 2 pixels.

The values provided to stroke-dasharray can be in pixels, percentages, or even unitless numbers. When using percentages, the values are relative to the length of the path being stroked. For example, stroke-dasharray: 50% 25% creates a pattern with a dash of length 50% of the path’s length followed by a gap of length 25% of the path’s length.

Applying stroke-dasharray to SVG

In SVG, the stroke-dasharray property is commonly used to style the outlines of shapes and paths. By specifying different dash and gap lengths, developers can create visually appealing effects. For example, a dashed line can be created by setting stroke-dasharray: 5 2, while a dotted line can be achieved with stroke-dasharray: 1 3.

Here’s an example of how to apply stroke-dasharray to an SVG path:

<svg width="200" height="200">
  <path d="M10 80 C 40 10, 65 10, 95 80 S 150 150, 180 80" 
        stroke="black" stroke-width="2" fill="none" 
        stroke-dasharray="5 2" />
</svg>

In the above example, the stroke-dasharray property is set to 5 2, creating a dashed line effect for the SVG path.

Using stroke-dasharray in HTML elements

While stroke-dasharray is primarily used in SVG, it can also be applied to HTML elements. By setting the border-style property to dashed or dotted, and specifying the border-width and border-color, developers can create dashed or dotted borders.

Here’s an example of how to use stroke-dasharray in an HTML element:

<div style="border-style: dashed; border-width: 2px; border-color: black; 
            width: 200px; height: 200px; stroke-dasharray: 5 2;">
  This is a div with a dashed border.
</div>

In the above example, the stroke-dasharray property is applied to the div element, creating a dashed border with a dash of length 5 pixels followed by a gap of length 2 pixels.

Conclusion

The stroke-dasharray property is a powerful tool for creating dashed or dotted lines in SVG and HTML elements. By specifying the lengths of dashes and gaps, developers can achieve various visual effects. Whether it’s styling SVG paths or creating borders for HTML elements, stroke-dasharray offers flexibility and creativity in web design.

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