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fire.cpp
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fire.cpp
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#include "bitmap.h"
#include <vector>
#include "fire.h"
#include <string.h>
#include "funcs.h"
#include <math.h>
namespace Paintown{
static int MAX_X = 320;
static int MAX_Y = 240;
Fire::Fire(){
Graphics::blend_palette(colors, 64, Graphics::makeColor(64, 0, 0), Graphics::makeColor(255, 0, 0));
Graphics::blend_palette(colors + 64, 64, Graphics::makeColor(255, 0, 0), Graphics::makeColor(255, 255, 0));
Graphics::blend_palette(colors + 64 + 64, 96, Graphics::makeColor(255, 255, 0), Graphics::makeColor(255, 255, 255));
Graphics::blend_palette(colors + 64 + 64 + 64 + 32, 32, Graphics::makeColor(255, 255, 255), Graphics::makeColor(255, 255, 255));
data = new unsigned char*[MAX_Y];
for (int i = 0; i < MAX_Y; i++){
data[i] = new unsigned char[MAX_X];
memset(data[i], 0, MAX_X);
}
for (int i = 0; i < MAX_HOTSPOTS; i++){
hotspots[i] = Util::rnd(MAX_X);
directions[i] = 0;
}
for (int i = 0; i < MAX_WISPS; i++){
Wisp & wisp = wisps[i];
wisp.y = MAX_Y-1 + Util::rnd(MAX_Y);
wisp.x = Util::rnd(MAX_X);
wisp.life = MAX_Y;
wisp.angle = Util::rnd(360);
}
}
void Fire::updateHotspots(){
for (int i = 0; i < MAX_HOTSPOTS; i++){
// hotspots[i] = (hotspots[i] + Util::rnd(5) - 2) % MAX_X;
hotspots[i] += directions[i];
if (hotspots[i] >= MAX_X){
hotspots[i] -= MAX_X;
}
if (hotspots[i] < 0){
hotspots[i] += MAX_X;
}
directions[i] += (double) (Util::rnd(7) - 3) / 5.0;
if (directions[i] < -4){
directions[i] = -4;
}
if (directions[i] > 4){
directions[i] = 4;
}
}
int hotspot_length = 40;
for (int i = 0; i < MAX_HOTSPOTS; i++){
for (int x = -hotspot_length/2; x < hotspot_length/2; x++){
int position = ((int) hotspots[i] + x + MAX_X) % MAX_X;
int more = (int) (data[MAX_Y-1][position] + (hotspot_length / 2 - fabs((double) x)));
if (more >= MAX_COLORS){
more = MAX_COLORS - 1;
}
data[MAX_Y-1][position] = more;
}
}
}
void Fire::updateWisps(){
for (int i = 0; i < MAX_WISPS; i++){
Wisp & wisp = wisps[i];
wisp.y -= 2;
wisp.life -= 1;
wisp.angle = (wisp.angle + 1) % 360;
if (wisp.life < 0){
wisp.y = MAX_Y-1 + Util::rnd(MAX_Y);
wisp.life = MAX_Y;
}
int my = (int) wisp.y;
int mx = (int)(wisp.x + sin(Util::radians(wisp.angle)) * 10);
if (mx < 0){
mx += MAX_X;
}
if (mx >= MAX_X){
mx -= MAX_X;
}
if (my > 0 && my < MAX_Y){
int z = data[my][mx] + wisp.life * 2;
if (z >= MAX_COLORS){
z = MAX_COLORS - 1;
}
// z = MAX_COLORS - 1;
// std::cout << "Update flicker at " << mx << ", " << my << " to " << z << std::endl;
data[my][mx] = z;
}
}
}
void Fire::update(){
updateHotspots();
// updateWisps();
int decay = 1;
// for (int y = MAX_Y-1; y > 0; y--){
for (int y = 0; y < MAX_Y; y++){
for (int x = 0; x < MAX_X; x++){
if (y < MAX_Y-1){
int lx = x-1;
if (lx < 0){
lx += MAX_X;
}
int rx = x+1;
if (rx >= MAX_X){
rx -= MAX_X;
}
// int less = (int)((double) data[y+1][x] * 0.6 + (double) data[y+1][lx] * 0.3 + (double) data[y+1][rx] * 0.3);
unsigned char * down = data[y+1];
/* dont change these numbers (0.2, 0.62, 9) because they affect
* the height of the flames. if the value of fire does not go down
* monotonically then the entire screen will be filled with flames.
*/
int less = (int)((double) down[lx] * 0.19);
less += (int)((double) down[rx] * 0.19);
less += (int)((double) down[x] * (0.4 + Util::rnd(25) / 100.0));
less += (int)((double) data[y][x] * 0.10);
// less -= Util::rnd(15);
if (less < 0){
less = 0;
}
if (less >= MAX_COLORS){
less = MAX_COLORS - 1;
}
data[y][x] = (unsigned char) less;
} else {
int less = (int)((double) data[y][x] * 0.95);
if (less < 0){
less = 0;
}
data[y][x] = (unsigned char) less;
}
}
}
}
void Fire::draw(const Graphics::Bitmap & work){
// Bitmap::drawingMode(Bitmap::MODE_TRANS);
for (int y = 0; y < MAX_Y; y++){
for (int x = 0; x < MAX_X; x++){
// work.putPixel(x, y, colors[data[y][x]]);
if (data[y][x] > 0){
work.rectangleFill(x*2, y*2, x*2+1, y*2+1, colors[data[y][x]]);
}
}
}
// Bitmap::drawingMode(Bitmap::MODE_SOLID);
}
Fire::~Fire(){
for (int y = 0; y < MAX_Y; y++){
delete[] data[y];
}
delete[] data;
}
}

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