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<div>The code below is JavaScript. Pass X and Y arrays of x and y points (clockwise or counterclockwise), and n number of vertices. If you need it for a path element the SVG JavaScript binding provides dedicated functions like getPointAtLength(), getPathSegAtLength(), etc. to convert the path into polygon points. </div><div><br></div><div> function <span style="word-spacing:normal;line-height:1.25;">polygon_area</span><span style="word-spacing:normal;line-height:1.25;"> </span><span style="word-spacing:normal;line-height:1.25;">(X, Y, n) {</span></div><div><span style="word-spacing:normal;line-height:1.25;"> var</span><br></div><div> area = 0,</div><div> i,</div><div> &
nbsp; j = n - 1;</div><div><br></div><div> for (i = 0; i < n; j = i++) {</div><div> area += (X[j] + X[i]) * (Y[j] - Y[i]);</div><div> }</div><div><br></div><div> return Math.abs(area / 2);</div><div> }</div><div><br></div><div>Domenico</div>
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