Program Listing for File fireanimation.cpp

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#include "../utility.h"
#include "fireanimation.h"

namespace PixelMaestro {
    FireAnimation::FireAnimation(Section& section) : Animation(section) {
        type_ = AnimationType::Fire;
        map();
    }

    uint8_t FireAnimation::get_multiplier() const {
        return this->multiplier_;
    }

    void FireAnimation::map() {
        // Randomize the bottom row
        for (uint16_t x = 0; x < dimensions_.x; x++) {
            // If a Palette has not been set, use a default value
            if (palette_ != nullptr) {
                map_[dimensions_.y - 1][x] = Utility::abs_int(32768 + Utility::rand()) % palette_->get_num_colors();
            }
            else {
                map_[dimensions_.y - 1][x] = Utility::abs_int(32768 + Utility::rand()) % 10;
            }
        }

        // Calculate the remaining Pixels based on the bottom row
        for (uint16_t y = 0; y < dimensions_.y - 1; y++) {
            for (uint16_t x = 0; x < dimensions_.x; x++) {
                // http://lodev.org/cgtutor/fire.html
                set_map_color_index(x, y,
                    (map_[(y + 1) % dimensions_.y][(x - 1 + dimensions_.x) % dimensions_.x] +
                    map_[(y + 1) % dimensions_.y][x % dimensions_.x] +
                    map_[(y + 1) % dimensions_.y][(x + 1) % dimensions_.x] +
                    map_[(y + 2) % dimensions_.y][x % dimensions_.x]) *
                    (float)((this->multiplier_ + 200) / (float)1000));  // 200 is a magic number added to the multiplier to get a decently sized flame effect without hitting the limits of uint8_t.
            }
        }
    }

    void FireAnimation::set_multiplier(uint8_t multiplier) {
        this->multiplier_ = multiplier;
    }

    void FireAnimation::update() {
        map();
    }
}