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.


Comments

Post a Comment

Popular posts from this blog

c++ - Difference between pre and post decrement in recursive function argument -

i have following sample code used pre-decrement void function(int c) { if(c == 0) { return; } else { cout << "dp" << c << endl; function(--c); cout << c << endl; return; } } this function give output input 4 : dp3 dp2 dp1 dp0 0 1 2 3 but when use post decrement void function(int c) { if(c == 0) { return; } else { cout << "dp" << c << endl; function(c--); cout << c << endl; return; } } output goes in infinite loop dp4 can explain me in detail why happens ? this happens because function(c--) called same value of c , when finishes c decremented. recursively called, hence called same value no chance of return , hit stack overflow error. assume this, int x = 1, y = 0; y = x++ result y == 1 , x == 2. if y = ++x , bot x , y 2.
Read more

php - Nothing but 'run(); ' when browsing to my local project, how do I fix this? -

i added new project. made mistake in projectname.conf file in sites-available apache2, led me reinstalling apache2. after reinstalling , re-enabling projects on every page of every project .. <body> run(); </body> .. i've run composer update, restarted service, restarted pc, checked config files, tried disabling new project. there nothing in error log, , access.log: 127.0.0.1 - - [15/may/2015:01:40:47 +0200] "get / http/1.1" 304 181 "-" "mozilla/5.0 (x11; ubuntu; linux x86_64; rv:38.0) gecko/20100101 firefox/38.0" maybe i'm forgetting apache2 reinstall? don't think did different last time installed it. looks haven't setup php correctly. take @ this great guide , maybe you're forgetting link php config apache2.
Read more

php - How can I echo out this array? -

i don't know how go grabbing data in variable , put foreach loop. class tree{ private $info = array( array('name'=>'jim','state'=>'nu','company'=>'nu','phone'=>array('cell'=>'5615111111','office'=>'5611111111'),'email'=>array('primary'=>'exs@example.com','ex@there.com')), array('name'=>'joe smith','city'=>'phoenix','phone'=>'4805551111','email'=>'jsmith@some_email.com'), array('name'=>'john doe','city'=>'chandler','company'=>'doe co.','email'=>array('jdoe@gmail.com','personal'=>'email@email.com'),'phone'=>'6025550002') ); } if you're inside of class, can access private variable using $this->variablename . example, i
Read more