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plot.h
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plot.h
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#pragma once
//#include "math.h"
#include "widget.h"
struct DataPoints
{
std::vector<std::pair<double, double>> Data; // <x value, y value>
std::vector<std::pair<String, String>> Labels; // <x label, y label>
bool Xlabels = false;
bool Ylabels = false;
~DataPoints()
{
Data.clear();
Labels.clear();
}
uint32_t getXLabelWidth(const uint8_t *font)
{
uint32_t w = 0;
u8g2.setFont(font);
for (auto i : Labels)
w += (u8g2.getUTF8Width(i.first.c_str())); // * 2);
return w;
}
};
class Plot : public Widget
{
private:
double maxX = 0, maxY = 0; //real x,y values corresponding to top right corner of plot
double minX = 0, minY = 0; //real x,y values corresponding to bottom left corner of plot
double scaleX = 1, scaleY = 1;
bool hasXlabels = false;
bool hasYlabels = false;
const uint8_t *axisLabelsFont;
const std::vector<uint16> ColorTable{GxEPD_RED, GxEPD_BLACK, GxEPD_DARKGREY, GxEPD_LIGHTGREY, GxEPD_BLACK, GxEPD_RED};
inline int XtoPx(double x)
{
return dx + borderX + (x + abs(minX)) * scaleX; //convert real x value to pixel x position
};
inline int YtoPy(double y)
{
return dy + dh - borderY - (y - (minY)) * scaleY; //convert real y value to pixel y position
};
inline void fixMinMax(double x, double y)
{
maxX = fmax(maxX, x); //check if point x,y is located outside of plot
maxY = fmax(maxY, y); //if so, then enlarge displayed area (zoom out)
minX = fmin(minX, x);
minY = fmin(minY, y);
}
uint8_t getFontHeight()
{
u8g2.setFont(axisLabelsFont);
return u8g2.getFontAscent();
}
uint16_t getXLabelsStep(DataPoints &plot)
{
uint16_t fit_labels = trunc(dw / plot.getXLabelWidth(axisLabelsFont)) * plot.Data.size(); //how many labels can we fit in x axis
return (plot.Data.size() / fit_labels);
}
// uint16_t getYLabelsStep(DataPoints &plot)
// {
// uint16_t fit_labels = trunc(dw / plot.getXLabelWidth(axisLabelsFont)) * plot.Data.size(); //how many labels can we fit in x axis
// return (plot.Data.size() / fit_labels);
// }
public:
std::vector<DataPoints> Plots;
bool FitZero = true; //true means plot will be zoomed to fit point 0,0 as well as whole graph
bool ShowXAxis = true;
bool ShowYAxis = true;
bool ShowBorder = true;
int borderX = 5, borderY = 5;
Plot(int x, int y, int w, int h) : Widget(x, y, w, h), borderX(w / 30), borderY(h / 30) { addPlot(); };
~Plot()
{
Plots.clear();
}
void redraw()
{
if (!Plots.size()) //if no plots, then exit
return;
if (FitZero)
maxX = maxY = minX = minY = 0;
else
{
maxX = minX = Plots.front().Data.front().first;
maxY = minY = Plots.front().Data.front().second;
}
for (auto j : Plots)
for (auto i : j.Data)
fixMinMax(i.first, i.second);
scaleX = ((double)(dw - borderX * 2)) / (maxX - minX); //calculate plot scale based on datapoints
scaleY = ((double)(dh - borderY * 2)) / (maxY - minY);
//QuickCG::drawRect(dx, dy, dw + dx, dh + dy, QuickCG::RGB_Black);
if (ShowYAxis)
{
int off = YtoPy(0);
if ((off > dy) && (off < dy + dh))
display.drawFastHLine(dx, off, /*dx +*/ dw, GxEPD_DARKGREY); //if should visible, draw x axis
}
if (ShowXAxis)
{
int off = XtoPx(0);
if ((off > dx) && (off < dx + dw))
display.drawFastVLine(off, dy, /*dy +*/ dh, GxEPD_DARKGREY); //if should visible, draw y axis
}
#ifdef WIDGETS_SHOW_DEBUG_FRAMES
ShowBorder = true;
#endif
if (ShowBorder)
{
display.drawFastHLine(dx, dy, /*dx +*/ dw, GxEPD_DARKGREY);
display.drawFastHLine(dx, dy + dh, /*dx +*/ dw, GxEPD_DARKGREY);
display.drawFastVLine(dx, dy, /*dy +*/ dh, GxEPD_DARKGREY);
display.drawFastVLine(dx + dw, dy, /*dy +*/ dh, GxEPD_DARKGREY);
}
u8g2.setFont(axisLabelsFont);
auto cindex = 0;
for (auto j : Plots) //for each plot
if (j.Data.size())
{
uint16_t LabelXstep = getXLabelsStep(j);
Serial.println("LabelXstep: " + String(LabelXstep));
auto last = j.Data.front();
uint16_t n = 0;
for (auto i : j.Data) //for each data point od current plot
{
uint16_t x1 = XtoPx(last.first);
uint16_t x2 = XtoPx(i.first);
uint16_t y1 = YtoPy(last.second);
uint16_t y2 = YtoPy(i.second);
display.drawLine(x1, y1, x2, y2, ColorTable.at(cindex));
display.drawLine(x1, y1 - 1, x2, y2 - 1, ColorTable.at(cindex));
display.drawLine(x1, y1 + 1, x2, y2 + 1, ColorTable.at(cindex));
last = i;
n++;
}
u8g2.setForegroundColor(GxEPD_BLACK);
n = 0;
for (auto i : j.Data) //for each data point od current plot
{
if (hasYlabels)
{
uint16_t strw = u8g2.getUTF8Width(j.Labels.at(n).second.c_str()) / 2;
uint16_t curx = XtoPx(i.first) - strw;
uint16_t cury = YtoPy(i.second) + getFontHeight() - getFontHeight() / 2;
display.fillCircle(XtoPx(i.first), YtoPy(i.second), strw + 1, GxEPD_WHITE);
//display.drawCircle(XtoPx(i.first), YtoPy(i.second), strw + 2, GxEPD_BLACK);
u8g2.setCursor(curx, cury + 1);
u8g2.print(j.Labels.at(n).second);
}
if (hasXlabels)
{
if (!(n % LabelXstep))
{
uint16_t curx = XtoPx(i.first) - u8g2.getUTF8Width(j.Labels.at(n).first.c_str()) / 2;
uint16_t cury = dy + dh + getFontHeight();
// Serial.println("x,y: " + String(curx)+", "+String(cury));
// Serial.println("["+j.Labels.at(n).first+"]");
u8g2.setCursor(curx, cury + 2);
u8g2.print(j.Labels.at(n).first);
}
}
n++;
}
cindex = ++cindex % ColorTable.size(); //iteration over each color for each plot
}
};
void addPlot()
{
DataPoints p;
Plots.push_back(std::move(p));
}
void addPoint(double x, double y, int index)
{
Plots.at(index).Data.push_back(std::make_pair(x, y));
};
void addPoint(double x, double y, String XLabel = "", String YLabel = "", int index = 0)
{
Plots.at(index).Data.push_back(std::make_pair(x, y));
Plots.at(index).Labels.push_back(std::make_pair(XLabel, YLabel));
if (XLabel != "")
{
hasXlabels = true;
Plots.at(index).Xlabels = true;
}
if (YLabel != "")
{
Plots.at(index).Ylabels = true;
hasYlabels = true;
}
};
void clear()
{
Plots.clear();
hasXlabels = false;
hasYlabels = false;
}
void clear(int index)
{
Plots.at(index).Data.clear();
Plots.at(index).Labels.clear();
}
void setData(std::vector<double> &dt, int index = 0)
{
int j = 0;
for (auto i : dt)
addPoint(j++, i, index);
}
void setAxisLabelsFont(const uint8_t *font)
{
axisLabelsFont = font;
}
};