OpenSpace/modules/globebrowsing/tile/tileprovider/tileproviderbylevel.cpp

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 * OpenSpace                                                                             *
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 * Copyright (c) 2014-2017                                                               *
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#include <modules/globebrowsing/tile/tileprovider/tileproviderbylevel.h>

#include <ghoul/misc/dictionary.h>

namespace {
    const char* KeyProviders = "LevelTileProviders";
    const char* KeyMaxLevel = "MaxLevel";
    const char* KeyTileProvider = "TileProvider";
}

namespace openspace {
namespace globebrowsing {
namespace tileprovider {

TileProviderByLevel::TileProviderByLevel(const ghoul::Dictionary& dictionary) {
    ghoul::Dictionary providers = dictionary.value<ghoul::Dictionary>(KeyProviders);

    for (size_t i = 0; i < providers.size(); i++) {
        std::string dictKey = std::to_string(i + 1);
        ghoul::Dictionary levelProviderDict = providers.value<ghoul::Dictionary>(
            dictKey
        );
        double floatMaxLevel;
        int maxLevel = 0;
        if (!levelProviderDict.getValue<double>(KeyMaxLevel, floatMaxLevel)) {
            throw std::runtime_error(
                "Must define key '" + std::string(KeyMaxLevel) + "'"
            );
        }
        maxLevel = std::round(floatMaxLevel);
            
        ghoul::Dictionary providerDict;
        if (!levelProviderDict.getValue<ghoul::Dictionary>(KeyTileProvider, providerDict))
        {
            throw std::runtime_error(
                "Must define key '" + std::string(KeyTileProvider) + "'"
            );
        }
            
        TileProvider* tileProvider = TileProvider::createFromDictionary(providerDict);
        _levelTileProviders.push_back(std::shared_ptr<TileProvider>(tileProvider));
            
        // Ensure we can represent the max level
        if(_providerIndices.size() < maxLevel){
            _providerIndices.resize(maxLevel+1, -1);
        }
            
        // map this level to the tile provider index
        _providerIndices[maxLevel] = _levelTileProviders.size() - 1;
    }
        
    // Fill in the gaps (value -1) in provider indices, from back to end
    for(int i = _providerIndices.size() - 2; i >= 0; --i){
        if(_providerIndices[i] == -1){
            _providerIndices[i] = _providerIndices[i+1];
        }
    }
}

Tile TileProviderByLevel::getTile(const TileIndex& tileIndex) {
    return levelProvider(tileIndex.level)->getTile(tileIndex);
}

Tile TileProviderByLevel::getDefaultTile() {
    return levelProvider(0)->getDefaultTile();
}

Tile::Status TileProviderByLevel::getTileStatus(const TileIndex& index) {
    return levelProvider(index.level)->getTileStatus(index);
}

TileDepthTransform TileProviderByLevel::depthTransform() {
    TileDepthTransform transform;
    transform.depthOffset = 0.0f;
    transform.depthScale = 1.0f;
    return transform;
}

void TileProviderByLevel::update() {
    for(auto provider : _levelTileProviders){
        provider->update();
    }
}

void TileProviderByLevel::reset() {
    for(auto provider : _levelTileProviders){
        provider->reset();
    }
}

int TileProviderByLevel::maxLevel() {
    return _providerIndices.size()-1;
}

int TileProviderByLevel::providerIndex(int level) const {
    int clampedLevel = std::max(0, std::min(level, (int)_providerIndices.size()-1));
    return _providerIndices[clampedLevel];
}

TileProvider* TileProviderByLevel::levelProvider(int level) const {
    return _levelTileProviders[providerIndex(level)].get();
}

} // namespace tileprovider
} // namespace globebrowsing
} // namespace openspace