47 lines
1.2 KiB
C
47 lines
1.2 KiB
C
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#include "muduo/base/noncopyable.h"
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#include "muduo/base/Types.h"
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#include <vector>
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#include <stdlib.h> // ssize_t
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typedef struct gdImageStruct* gdImagePtr;
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class Plot : muduo::noncopyable
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{
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public:
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Plot(int width, int height, int totalSeconds, int samplingPeriod);
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~Plot();
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muduo::string plotCpu(const std::vector<double>& data);
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private:
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muduo::string toPng();
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// pair<shared_ptr<void*>, int> toPng();
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int getX(ssize_t x, ssize_t total) const;
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int getY(double value) const;
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void label(double maxValue);
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// gdFont is a typedef of unnamed struct, cannot be forward declared
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// wordaround suggested in http://stackoverflow.com/questions/7256436/forward-declarations-of-unnamed-struct
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struct MyGdFont;
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typedef struct MyGdFont* MyGdFontPtr;
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const int width_;
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const int height_;
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const int totalSeconds_;
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const int samplingPeriod_;
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gdImagePtr const image_;
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MyGdFontPtr const font_;
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const int fontWidth_;
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const int fontHeight_;
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const int background_;
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const int black_;
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const int gray_;
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const int blue_;
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const int kRightMargin_;
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static const int kLeftMargin_ = 5;
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static const int kMarginY_ = 5;
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const double ratioX_;
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};
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