How to ensure variables initialized from .h file are being used properly

@nacipua1 wrote:

I am working on a text rain project. I have seen an example but for processing and I am currently trying to translate it for OF usage.

Problem: I am ensure as why certain variables are being marked as undefined when they were added in the ofApp.h file. Could it be that I have added a class inside the ofApp.cpp?

This is my ofApp.cpp

#include "ofApp.h"
#include <string>

//--------------------------------------------------------------
void ofApp::setup() {
    
    vidGrabber.initGrabber(1280, 720);
    
//    video = new Capture (this, width,height);
//    video.start();
    
    string poemString = "A poem about bodies";
    
    nLetters = poemString.length();
    poemLetters = new TextRainLetter[nLetters];
    for (int i=0; i<nLetters; i++) {
        char c = poemString.at(i);
        float x = ofGetWidth() * ((float)(i+1)/(nLetters+1));
        float y = initialLetterYPosition;
        poemLetters[i] = new TextRainLetter(c,x,y);
    }
}

class TextRainLetter {
    
    char  c;
    float x;
    float y;
public:
    TextRainLetter (char cc, float xx, float yy) {
        c = cc;
        x = xx;
        y = yy;
    }
    
    //-----------------------------------
    void update() {
   
        int flippedX = (int)(ofGetWidth() - 1 - x);
        int index = ofGetWidth() *(int)y + flippedX;
        index = ofClamp(index, 0, ofGetWidth() * ofGetHeight() - 1);
      
        int thresholdTolerance = 5;
        int thresholdLo = brightnessThreshold - thresholdTolerance;
        int thresholdHi = brightnessThreshold + thresholdTolerance;
        
        float pixelBrightness = vidGrabber.getPixels().getColor(index).getBrightness();
        
        if (pixelBrightness > thresholdHi) {
            y += letterGravity; //move downward
            
        } else {
            while ((y > initialLetterYPosition) && (pixelBrightness < thresholdLo)){
                y -= letterGravity;
                index = ofGetWidth() *(int)y + flippedX;
                index = ofClamp(index, 0, ofGetWidth() * ofGetHeight() - 1);
                pixelBrightness = vidGrabber.getBrightness(index);
            }
        }
        
        if ((y >= ofGetHeight()-1) || (y < initialLetterYPosition)){
            y = initialLetterYPosition;
        }
    }
    
    //-----------------------------------
    void reset(){
        y = initialLetterYPosition;
    }
    
    //-----------------------------------
    void draw() {
//        // Draw the letter. Use a simple black "drop shadow"
//        // to achieve improved contrast for the typography.
//        fill(0,0,0);
//        text (""+c, x+1,y+1);
//        text (""+c, x-1,y+1);
//        text (""+c, x+1,y-1);
//        text (""+c, x-1,y-1);
//        fill(255,255,255);
//        text (""+c, x,y);
    }
};


//--------------------------------------------------------------
void ofApp::update(){
    vidGrabber.update();
}

//--------------------------------------------------------------
void ofApp::draw(){
    if (video.available()) {
        video.read();
        video.loadPixels();
        
        // this translate & scale flips the video left/right.
        pushMatrix();
        translate (width,0);
        scale (-1,1);
        image (video, 0, 0, width, height);
        popMatrix();
        
        for (int i=0; i<nLetters; i++) {
            poemLetters[i].update();
            poemLetters[i].draw();
        }
    }
}

//--------------------------------------------------------------
void ofApp::keyPressed(int key){
    if (key == OF_KEY_UP) {
        brightnessThreshold = min(255, brightnessThreshold + 1);
        cout << "Brightness Threshold:" << brightnessThreshold << endl;
    } else if (key == OF_KEY_DOWN) {
        brightnessThreshold = max(0, brightnessThreshold - 1);
        cout << "Brightness Threshold:" << brightnessThreshold << endl;
    } else if (key == 49){
        for (int i = 0; i < nLetters; i++) {
            poemLetters[i].reset();
        }
    }
}

//--------------------------------------------------------------
void ofApp::keyReleased(int key){

}

//--------------------------------------------------------------
void ofApp::mouseMoved(int x, int y ){

}

//--------------------------------------------------------------
void ofApp::mouseDragged(int x, int y, int button){

}

//--------------------------------------------------------------
void ofApp::mousePressed(int x, int y, int button){

}

//--------------------------------------------------------------
void ofApp::mouseReleased(int x, int y, int button){

}

//--------------------------------------------------------------
void ofApp::mouseEntered(int x, int y){

}

//--------------------------------------------------------------
void ofApp::mouseExited(int x, int y){

}

//--------------------------------------------------------------
void ofApp::windowResized(int w, int h){

}

//--------------------------------------------------------------
void ofApp::gotMessage(ofMessage msg){

}

//--------------------------------------------------------------
void ofApp::dragEvent(ofDragInfo dragInfo){ 

}

This is my ofApp.h file

#pragma once

#include "ofMain.h"

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 myFont;
    ofVideoGrabber vidGrabber;
    int ySpeed,yLoc,xLoc;

    
    float letterGravity = 1.0;
    int brightnessThreshold = 100;
    float initialLetterYPosition = 10;
    TextRainLetter poemLetters[];
    int nLetters;
		
};

Many Thanks!

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