java - Fractal Terrain always has a Mountain on the bottom -


i working on project, , i'm done terrain generation, have small problem. bottom of terrain mountain. nothing have tried has worked. efficiency improvements welcome well.

here algorithm:

private void generateterrain() {     random rand = new random();     int seed = rand.nextint(panel.maxseed - panel.minseed) + panel.minseed;     int offset = 10000;     int sidelength = panel.mapsize - 1;     int halfsidelength;     int average;     int ytop;     int ybottom;      panel.map[0][0] = seed;     panel.map[panel.mapsize - 1][0] = seed;     panel.map[0][panel.mapsize - 1] = seed;     panel.map[panel.mapsize - 1][panel.mapsize - 1] = seed;      while (sidelength > 0) {         halfsidelength = sidelength / 2;          (int x = 0; x < panel.mapsize - 1; x += sidelength) {             (int y = 0; y < panel.mapsize - 1; y += sidelength) {                 average = panel.map[x][y]                         + panel.map[x + sidelength][y]                         + panel.map[x][y + sidelength]                         + panel.map[x + sidelength][y + sidelength];                 average /= 4;                  if (rand.nextboolean()) {                     average += rand.nextint(offset);                 } else {                     average -= rand.nextint(offset);                 }                  panel.map[x + halfsidelength][y + halfsidelength] = average;                  ytop = y - halfsidelength;                 ybottom = y + halfsidelength;                  if (ytop < 0) ytop = y + halfsidelength;                 if (ybottom > panel.mapsize - 1) ybottom = y - halfsidelength;                  average = panel.map[x][y]                         + panel.map[x + sidelength][y]                         + panel.map[x + halfsidelength][ytop]                         + panel.map[x + halfsidelength][ybottom];                 average /= 4;                   panel.map[x + halfsidelength][y] = average;             }         }          (int x = 0; x < panel.mapsize; x += sidelength) {             (int y = 0; y < panel.mapsize - 1; y += sidelength) {                 int xright = x + halfsidelength;                  if (xright > panel.mapsize - 1) xright = x - halfsidelength;                  average = panel.map[x][y]                         + panel.map[x][y + sidelength]                         + panel.map[xright][y + halfsidelength]                         + panel.map[xright][y + halfsidelength];                 average /= 4;                  panel.map[x][y + halfsidelength] = average;              }         }          offset *= 0.5;         sidelength /= 2;         if (offset < 1) {             offset = 1;         }     }      (int x = 0; x < panel.mapsize - 1; x++) {         (int y = 0; y < panel.mapsize - 1; y++) {             panel.map[x][y] = (int) ((panel.colors.length - 1) - panel.map[x][y] / 500);             if (panel.map[x][y] < 0) {                 panel.map[x][y] = 0;             } else if (panel.map[x][y] > 20) {                 panel.map[x][y] = 20;             }         }     }     panel.drawimage(); }

i see have incorporated of suggestions made original code.

the solution have proposed has 3 loops. have joined first 2 loops, limits of loops different. means don't set values bottom line. (these initialised zero, come out mountains in final map.)

it's fence-post error. illustrate:

+-----+-----+-----+-----+ |     |     |     |     |  |     |     |     |     |  +-----+-----+-----+-----+ |     |     |     |     |  |     |     |     |     |  +-----+-----+-----+-----+ |     |     |     |     |  |     |     |     |     |  +-----+-----+-----+-----+ |     |     |     |     |  |     |     |     |     |  +-----+-----+-----+-----+

in 4×4 map,

  • the first loop treats centre points 4×4 squares,
  • the second loop treats midpoints of 4×5 horizontal lines and
  • the third loop treats midpoints of 5×4 vertical lines.

another issue last loop calculates colour indices height values should include map values on right , bottom borders, maybe need them auxiliary values terrain creation.


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