Method getChart

src/backend/common/graphics_common.cpp:331–364

}

fg_chart ForgeManager::getChart(const fg_window window, const int r,
                                const int c, const fg_chart_type ctype) {
    auto gIter = mWndGridMap.find(window);

    int rows = std::get<0>(gIter->second);
    int cols = std::get<1>(gIter->second);

    if (c >= cols || r >= rows) {
        AF_ERROR("Window Grid points are out of bounds", AF_ERR_TYPE);
    }

    // upgrade to exclusive access to make changes
    auto chart_iter = mChartMap.find(window);
    ChartPtr& chart = (chart_iter->second)[c * rows + r];

    if (!chart) {
        fg_chart temp = NULL;
        FG_CHECK(mPlugin->fg_create_chart(&temp, ctype));
        chart.reset(new Chart({temp}));
        mChartAxesOverrideMap[chart->handle] = false;
    } else {
        fg_chart_type chart_type;
        FG_CHECK(mPlugin->fg_get_chart_type(&chart_type, chart->handle));
        if (chart_type != ctype) {
            // Existing chart is of incompatible type
            mChartAxesOverrideMap.erase(chart->handle);
            fg_chart temp = 0;
            FG_CHECK(mPlugin->fg_create_chart(&temp, ctype));
            chart.reset(new Chart({temp}));
            mChartAxesOverrideMap[chart->handle] = false;
        }
    }
    return chart->handle;
}

unsigned long long ForgeManager::genImageKey(unsigned w, unsigned h,
                                             fg_channel_format mode,