ofx Realtime Mouse Graph Plot

/**
* @file
* @brief ofxGrtTimeseriesPlot Example: this example demonstrates how to use the TimeseriesPlot class to plot mouse data over time
*/

#pragma once

#include "ofMain.h"
#include "ofxGrt.h"

using namespace GRT;

class ofApp : public ofBaseApp{

public:
    void setup();
    void update();
    void draw();

    void keyPressed(int key);
    void keyReleased(int key);
    void mouseMoved(int x, int y );
    void mouseDragged(int x, int y, int button);
    void mousePressed(int x, int y, int button);
    void mouseReleased(int x, int y, int button);
    void mouseEntered(int x, int y);
    void mouseExited(int x, int y);
    void windowResized(int w, int h);
    void dragEvent(ofDragInfo dragInfo);
    void gotMessage(ofMessage msg);

    ofTrueTypeFont font;
    ofxGrtTimeseriesPlot plot1;
    ofxGrtTimeseriesPlot plot2;
};

// cpp ------------------------------------------------


#include "ofApp.h"

#define TIMESERIES_LENGTH 200
#define NUM_DIMENSIONS 2
float lastX = 0;
float lastY = 0;
float lastTic = 0;

//--------------------------------------------------------------
void ofApp::setup(){
    ofSetBackgroundColor(255);

    //Load the font for the graph
    font.load("verdana.ttf", 12, true, true);
    font.setLineHeight(14.0f);

    //Setup the first plot
    plot1.setup( TIMESERIES_LENGTH, NUM_DIMENSIONS, "Mouse Data" );
    plot1.setDrawGrid( true );
    plot1.setDrawInfoText( true );
    plot1.setFont( font );

    //Setup the second plot
    plot2.setup( TIMESERIES_LENGTH, NUM_DIMENSIONS, "Mouse Derivative" );
    plot2.setDrawGrid( true );
    plot2.setDrawInfoText( true );
    plot2.setFont( font );
}


//--------------------------------------------------------------
void ofApp::update(){

    //Get the mouse data
    float mouseX = ofGetMouseX();
    float mouseY = ofGetMouseY();
    float tic = ofGetElapsedTimeMillis();
    float delta = tic-lastTic;

    vector<float> data(2);

    //Update the 1st plot
    data[0] = mouseX;
    data[1] = mouseY;
    plot1.update( data );

    //Update the 2nd plot
    data[0] = lastX > 0 ? (mouseX-lastX) / delta : 0.0;
    data[1] = lastY > 0 ? (mouseY-lastY) / delta : 0.0;
    plot2.update( data );

    //Store the mouse values for the next update
    lastX = mouseX;
    lastY = mouseY;
    lastTic = tic;
}

//--------------------------------------------------------------
void ofApp::draw(){

    int plotX = 20;
    int plotY = 20;
    int plotW = ofGetWidth() - (plotX*2);
    int plotH = 200;

    plot1.draw( plotX, plotY, plotW, plotH );

    plotY += 25 + plotH;
    plot2.draw( plotX, plotY, plotW, plotH );
}

//--------------------------------------------------------------
void ofApp::keyPressed(int key){
    switch( key ){
        case 'r':
            //Reset the data contents and ranges of the plot
            plot1.reset();
            plot2.reset();
        break;
    }
}