minecraft-pe-0.6.1/src/world/level/tile/Mushroom.cpp

#include "Mushroom.h"

Mushroom::Mushroom(int id, int tex)
:   super(id, tex)
{
	float ss = 0.2f;
	this->setShape(0.5f - ss, 0, 0.5f - ss, 0.5f + ss, ss * 2, 0.5f + ss);
	this->setTicking(true);
}

void Mushroom::tick( Level* level, int x, int y, int z, Random* random ) {
	if(random->nextInt(25) == 0) {
		int r = 4;
		int max = 5;
		for (int xx = x - r; xx <= x + r; xx++)
		for (int zz = z - r; zz <= z + r; zz++)
		for (int yy = y - 1; yy <= y + 1; yy++) {
			if (level->getTile(xx, yy, zz) == id && --max <= 0) return;
		}

		int x2 = x + random->nextInt(3) - 1;
		int y2 = y + random->nextInt(2) - random->nextInt(2);
		int z2 = z + random->nextInt(3) - 1;
		for (int i = 0; i < 4; i++) {
			if (level->isEmptyTile(x2, y2, z2) && canSurvive(level, x2, y2, z2)) {
				x = x2;
				y = y2;
				z = z2;
			}
			x2 = x + random->nextInt(3) - 1;
			y2 = y + random->nextInt(2) - random->nextInt(2);
			z2 = z + random->nextInt(3) - 1;
		}

		if (level->isEmptyTile(x2, y2, z2) && canSurvive(level, x2, y2, z2)) {
			level->setTile(x2, y2, z2, id);
		}
	}
}

bool Mushroom::mayPlace( Level* level, int x, int y, int z, unsigned char face ) {
	return super::mayPlace(level, x, y, z, face) && canSurvive(level, x, y, z);
}

bool Mushroom::mayPlaceOn( int tile ) {
	return Tile::solid[tile];
}

bool Mushroom::canSurvive( Level* level, int x, int y, int z ) {
	if (y < 0 || y >= LevelConstants::LEVEL_HEIGHT/*Level::maxBuildHeight*/)
        return false;

	int below = level->getTile(x, y - 1, z);
	return (level->getRawBrightness(x, y, z) < 13 && mayPlaceOn(below));
}