Repo created

libs/map/chart_generator.hpp

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+#pragma once
+
+#include "indexer/map_style.hpp"
+
+#include "geometry/point2d.hpp"
+#include "geometry/point_with_altitude.hpp"
+
+#include <cstdint>
+#include <vector>
+
+namespace maps
+{
+uint32_t constexpr kAltitudeChartBPP = 4;
+
+void ScaleChartData(std::vector<double> & chartData, double scale);
+void ShiftChartData(std::vector<double> & chartData, double shift);
+void ReflectChartData(std::vector<double> & chartData);
+
+/// \brief fills uniformAltitudeDataM with altitude data which evenly distributed by
+/// |resultPointCount| points. |distanceDataM| and |altitudeDataM| form a curve of route altitude.
+/// This method is used to generalize and evenly distribute points of the chart.
+bool NormalizeChartData(std::vector<double> const & distanceDataM, geometry::Altitudes const & altitudeDataM,
+                        size_t resultPointCount, std::vector<double> & uniformAltitudeDataM);
+
+/// \brief fills |yAxisDataPxl|. |yAxisDataPxl| is formed to pevent displaying
+/// big waves on the chart in case of small deviation in absolute values in |yAxisData|.
+/// \param height image chart height in pixels.
+/// \param minMetersInPixel minimum meter number per height pixel.
+/// \param altitudeDataM altitude data vector in meters.
+/// \param yAxisDataPxl Y-axis data of altitude chart in pixels.
+bool GenerateYAxisChartData(uint32_t height, double minMetersPerPxl, std::vector<double> const & altitudeDataM,
+                            std::vector<double> & yAxisDataPxl);
+
+/// \brief generates chart image on a canvas with size |width|, |height| with |geometry|.
+/// (0, 0) is a left-top corner. X-axis goes down and Y-axis goes right.
+/// \param width is result image width in pixels.
+/// \param height is result image height in pixels.
+/// \param geometry is points which is used to draw a curve of the chart.
+/// \param mapStyle is a current map style.
+/// \param frameBuffer is a vector for a result image. It's resized in this method.
+/// It's filled with RGBA(8888) image date.
+bool GenerateChartByPoints(uint32_t width, uint32_t height, std::vector<m2::PointD> const & geometry, MapStyle mapStyle,
+                           std::vector<uint8_t> & frameBuffer);
+
+bool GenerateChart(uint32_t width, uint32_t height, std::vector<double> const & distanceDataM,
+                   geometry::Altitudes const & altitudeDataM, MapStyle mapStyle, std::vector<uint8_t> & frameBuffer);
+}  // namespace maps