var x1 = new AMap.LngLat(left_lng, left_lat)
var x2 = new AMap.LngLat(right_lng, left_lat)
var y = new AMap.LngLat(left_lng, right_lat)
var center_x1 = new AMap.LngLat(center_left_lng, center_left_lat)
var center_x2 = new AMap.LngLat(center_right_lng, center_left_lat)
var center_y = new AMap.LngLat(center_left_lng, center_right_lat)
var x_distance = x1.distance(x2);
var y_distance = x1.distance(y);
var center_x_distance = center_x1.distance(center_x2);
var center_y_distance = center_x1.distance(center_y);
console.log(x_distance, y_distance)
console.log(center_x_distance, center_y_distance)
drawGrad(x_distance, y_distance);function drawGrad(x, y) {//x,y代表的是距离
var x_total = Math.floor(x / km);//首尾，故点多1
var y_total = Math.floor(y / km);
console.log(x_total, y_total)
for (var i = 0; i < x_total + 1; i++) {for (var j = 0; j < y_total + 1; j++) {let point = southWest.offset(km * i, -km * j)//在内部矩形，则跳过if ((center_left_lng <= point.lng && point.lng <= center_right_lng) && (center_right_lat <= point.lat && point.lat <= center_left_lat)) {continue}pointsObj[i + "_" + j] = point.lng + ',' + point.latif (i > 0 && j > 0) {let last_point = pointsObj[(i - 1) + '_' + (j - 1)];if(!last_point){continue}arrList.push(last_point+ '|' + pointsObj[i + '_' + j])}var bounds2 = new AMap.Bounds(southWest, point)var rectangle2 = new AMap.Rectangle({bounds: bounds2,strokeColor: '#000',strokeWeight: 1,strokeStyle: 'dashed',fillColor: 'transparent',})rectangle2.setMap(map)if (i == x_total && j == y_total) {// console.error(Date.parse(new Date()))
      console.log(arrList.length)console.log(JSON.stringify(arrList))}}
}
}