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(svn r26999) -Codechange: make the variety distribution automatically scale to the maximum height of the map

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rubidium 2014-10-12 11:28:45 +00:00
parent caf3bda626
commit df5d5e2b8b
1 changed files with 35 additions and 42 deletions
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77
src/tgp.cpp
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@ -479,7 +479,8 @@ static void HeightMapSineTransform(height_t h_min, height_t h_max)
}
}
/* Additional map variety is provided by applying different curve maps
/**
* Additional map variety is provided by applying different curve maps
* to different parts of the map. A randomized low resolution grid contains
* which curve map to use on each part of the make. This filtered non-linearly
* to smooth out transitions between curves, so each tile could have between
@ -492,46 +493,38 @@ static void HeightMapSineTransform(height_t h_min, height_t h_max)
* The level parameter dictates the resolution of the grid. A low resolution
* grid will result in larger continuous areas of a land style, a higher
* resolution grid splits the style into smaller areas.
*
* At this point in map generation, all height data has been normalized to 0
* to 239.
* @param level Rough indication of the size of the grid sections to style. Small level means large grid sections.
*/
struct control_point_t {
height_t x;
height_t y;
};
struct control_point_list_t {
size_t length;
const control_point_t *list;
};
static const control_point_t _curve_map_1[] = {
{ 0, 0 }, { 48, 24 }, { 192, 32 }, { 240, 96 }
};
static const control_point_t _curve_map_2[] = {
{ 0, 0 }, { 16, 24 }, { 128, 32 }, { 192, 64 }, { 240, 144 }
};
static const control_point_t _curve_map_3[] = {
{ 0, 0 }, { 16, 24 }, { 128, 64 }, { 192, 144 }, { 240, 192 }
};
static const control_point_t _curve_map_4[] = {
{ 0, 0 }, { 16, 24 }, { 96, 72 }, { 160, 192 }, { 220, 239 }, { 240, 239 }
};
static const control_point_list_t _curve_maps[] = {
{ lengthof(_curve_map_1), _curve_map_1 },
{ lengthof(_curve_map_2), _curve_map_2 },
{ lengthof(_curve_map_3), _curve_map_3 },
{ lengthof(_curve_map_4), _curve_map_4 },
};
static void HeightMapCurves(uint level)
{
height_t ht[lengthof(_curve_maps)];
int mh = TGPGetMaxHeight();
/** Basically scale height X to height Y. Everything in between is interpolated. */
struct control_point_t {
height_t x; ///< The height to scale from.
height_t y; ///< The height to scale to.
};
/* Scaled curve maps; value is in height_ts. */
#define F(fraction) (fraction * mh * I2H(1))
const control_point_t curve_map_1[] = { { F(0.0), F(0.0) }, { F(0.6 / 3), F(0.1) }, { F(2.4 / 3), F(0.4 / 3) }, { F(1.0), F(0.4) } };
const control_point_t curve_map_2[] = { { F(0.0), F(0.0) }, { F(0.2 / 3), F(0.1) }, { F(1.6 / 3), F(0.4 / 3) }, { F(2.4 / 3), F(0.8 / 3) }, { F(1.0), F(0.6) } };
const control_point_t curve_map_3[] = { { F(0.0), F(0.0) }, { F(0.2 / 3), F(0.1) }, { F(1.6 / 3), F(0.8 / 3) }, { F(2.4 / 3), F(1.8 / 3) }, { F(1.0), F(0.8) } };
const control_point_t curve_map_4[] = { { F(0.0), F(0.0) }, { F(0.2 / 3), F(0.1) }, { F(1.2 / 3), F(0.9 / 3) }, { F(2.0 / 3), F(2.4 / 3) } , { F(5.5 / 6), F(0.99) }, { F(1.0), F(0.99) } };
#undef F
/** Helper structure to index the different curve maps. */
struct control_point_list_t {
size_t length; ///< The length of the curve map.
const control_point_t *list; ///< The actual curve map.
};
const control_point_list_t curve_maps[] = {
{ lengthof(curve_map_1), curve_map_1 },
{ lengthof(curve_map_2), curve_map_2 },
{ lengthof(curve_map_3), curve_map_3 },
{ lengthof(curve_map_4), curve_map_4 },
};
height_t ht[lengthof(curve_maps)];
MemSetT(ht, 0, lengthof(ht));
/* Set up a grid to choose curve maps based on location; attempt to get a somewhat square grid */
@ -541,7 +534,7 @@ static void HeightMapCurves(uint level)
byte *c = AllocaM(byte, sx * sy);
for (uint i = 0; i < sx * sy; i++) {
c[i] = Random() % lengthof(_curve_maps);
c[i] = Random() % lengthof(curve_maps);
}
/* Apply curves */
@ -595,11 +588,11 @@ static void HeightMapCurves(uint level)
height_t *h = &_height_map.height(x, y);
/* Apply all curve maps that are used on this tile. */
for (uint t = 0; t < lengthof(_curve_maps); t++) {
for (uint t = 0; t < lengthof(curve_maps); t++) {
if (!HasBit(corner_bits, t)) continue;
const control_point_t *cm = _curve_maps[t].list;
for (uint i = 0; i < _curve_maps[t].length - 1; i++) {
const control_point_t *cm = curve_maps[t].list;
for (uint i = 0; i < curve_maps[t].length - 1; i++) {
const control_point_t &p1 = cm[i];
const control_point_t &p2 = cm[i + 1];