Orna GPS RPG view distance

view_distance.js

/*
 Orna RPG view distance formula:
 1. base view distance: 180m
 2. base factor per item: x1.2
 3. base factor per adornment: x1.02
 */
 
// There are two methods to calculate with factor(1.2):
// Method 1: 180 * Math.pow(1.2, N)
// Method 2: 1.2 * D(N - 1)
// The dfferent are when to use `Math.round`
 
// arr = new Array(11).fill(1).map((i, index) => index)
// arr = [0,1,2,3,4,5,6,7,8,9,10];
 
// method 1
arr.map(i => `${i}: ${~~(180 * Math.pow(1.2, i))}`)
/*
[
    "0: 180",
    "1: 216",
    "2: 259",
    "3: 311",
    "4: 373",
    "5: 447",
    "6: 537",
    "7: 644",
    "8: 773",
    "9: 928",
    "10: 1114"
]
*/




// method 2
function getS(n) {
  if (!n) return 180;
  n--;
  return ~~(1.2 * getS(n));
}

arr.map(i => `${i}: ${getS(i)}`)

/*
[
    "0: 180",
    "1: 216",
    "2: 259",
    "3: 310",
    "4: 372",
    "5: 446",
    "6: 535",
    "7: 642",
    "8: 770",
    "9: 924",
    "10: 1108"
]
*/

// It use method 2 in Orna RPG game to show view distance.

	Math.pow	(N-1)*1.2
0	180	180
1	216	216
2	259	259
3	311	310
4	373	372
5	447	446
6	537	535
7	644	642
8	773	770
9	928	924
10	1114	1108