shape-points
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Generate points for simple shapes and curves: arcs, rectangles, rounded rectangles, circles, ellipses, bezierCurveTo, bezierCurveThrough (i.e., bezier curves through specific points)
78 lines (58 loc) • 2.91 kB
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<h1 class="page-title">Source: line.js</h1>
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<pre class="prettyprint source linenums"><code>/**
* calculate points for a line with a certain thickness (either one thickness or a starting and ending thickness)
* @module shape-points/line
* @param {number} x1
* @param {number} y1
* @param {number} x2
* @param {number} y2
* @param {number|object} [thickness]
* @param {number} thickness.start
* @param {number} thickness.end
* @returns {array} [x1, y1, x2, y2, ... xn, yn]
*/
export function line(x1, y1, x2, y2, thickness)
{
thickness = thickness || 0
const angle = Math.atan2(y2 - y1, x2 - x1)
const perp = angle - Math.PI / 2
const half = isNaN(thickness) ? { start: thickness.start / 2, end: thickness.end / 2 } : { start: thickness / 2, end: thickness / 2 }
return [
x1 - Math.cos(perp) * half.start, y1 - Math.sin(perp) * half.start,
x2 - Math.cos(perp) * half.end, y2 - Math.sin(perp) * half.end,
x2 + Math.cos(perp) * half.end, y2 + Math.sin(perp) * half.end,
x1 + Math.cos(perp) * half.start, y1 + Math.sin(perp) * half.start
]
}
</code></pre>
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<h2><a href="index.html">Home</a></h2><h3>Modules</h3><ul><li><a href="module-shape-points.html">shape-points</a></li><li><a href="module-shape-points_arc.html">shape-points/arc</a></li><li><a href="module-shape-points_bezierCurveThrough.html">shape-points/bezierCurveThrough</a></li><li><a href="module-shape-points_bezierCurveTo.html">shape-points/bezierCurveTo</a></li><li><a href="module-shape-points_circle.html">shape-points/circle</a></li><li><a href="module-shape-points_ellipse.html">shape-points/ellipse</a></li><li><a href="module-shape-points_line.html">shape-points/line</a></li><li><a href="module-shape-points_quadraticCurveTo.html">shape-points/quadraticCurveTo</a></li><li><a href="module-shape-points_rect.html">shape-points/rect</a></li><li><a href="module-shape-points_roundedRect.html">shape-points/roundedRect</a></li></ul>
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Documentation generated by <a href="https://github.com/jsdoc/jsdoc">JSDoc 3.6.10</a> on Tue Mar 29 2022 14:31:03 GMT-0700 (Pacific Daylight Time)
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