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copied!<p>Although I didn't use canvas, how about this code?</p> <pre><code>function onPolygonComplete(polygon) { var bounds, paths, sw, ne, ystep, xstep, boxH, boxW, posArry, flag, pos, x, y, i, box, maxBoxCnt; //Delete old boxes. boxes.forEach(function(box, i) { box.setMap(null); delete box; }); //Calculate the bounds that contains entire polygon. bounds = new google.maps.LatLngBounds(); paths = polygon.getPath(); paths.forEach(function(latlng, i){ bounds.extend(latlng); }); //Calculate the small box size. maxBoxCnt = 8; sw = bounds.getSouthWest(); ne = bounds.getNorthEast(); ystep = Math.abs(sw.lat() - ne.lat()) / maxBoxCnt; boxH = Math.abs(sw.lat() - ne.lat()) / (maxBoxCnt + 1); xstep = Math.abs(sw.lng() - ne.lng()) / maxBoxCnt; boxW = Math.abs(sw.lng() - ne.lng()) / (maxBoxCnt + 1); for (y = 0; y < maxBoxCnt; y++) { for (x = 0; x < maxBoxCnt; x++) { //Detect that polygon is able to contain a small box. bounds = new google.maps.LatLngBounds(); posArry = []; posArry.push(new google.maps.LatLng(sw.lat() + ystep * y, sw.lng() + xstep * x)); posArry.push(new google.maps.LatLng(sw.lat() + ystep * y, sw.lng() + xstep * x + boxW)); posArry.push(new google.maps.LatLng(sw.lat() + ystep * y + boxH, sw.lng() + xstep * x)); posArry.push(new google.maps.LatLng(sw.lat() + ystep * y + boxH, sw.lng() + xstep * x + boxW)); flag = true; for (i = 0; i < posArry.length; i++) { pos = posArry[i]; if (flag) { flag = google.maps.geometry.poly.containsLocation(pos, polygon); bounds.extend(pos); } } //Draw a small box. if (flag) { box = new google.maps.Rectangle({ bounds : bounds, map : mapCanvas, strokeColor: '#00ffff', strokeOpacity: 0.5, strokeWeight: 1, fillColor: '#00ffff', fillOpacity : 0.5, clickable: false }); boxes.push(box); } } } } </code></pre> <p>This code works like this image. <img src="https://i.stack.imgur.com/m6c0M.png" alt="enter image description here"></p> <p>I wrote a page that explains the code. <a href="http://googlemaps.googlermania.com/google_maps_api_v3/en/poly_containsLocation.html" rel="noreferrer">http://googlemaps.googlermania.com/google_maps_api_v3/en/poly_containsLocation.html</a></p>

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