Passing gameState from update to draw

@bamu wrote:

In class today we had to make a simple frogger game as a quiz in under 30 mins. I took my written code and typed it up, and wanted to add a “game over” screen to the end of the game. To do this I created a simple int variable in ofApp.h and set it to 0 in the setup(). In the update() when one block collides with another, all velocities are set to zero effectively ending the game. When this condition is true, gameState changes to 1. When gameState == 1 in an if statement, a game over screen is drawn.

Simple enough… however draw() never sees that the gameState is 1. A simple cout << gameState within update() accurately outputs 1. When calling cout << gameState in draw, it does not report the change from 0 to 1. In fact it will out 00000000 until the game ends. At first I thought this must be a problem passing data between update and draw, and I did some research and found that I could move the whole code block there. Upon doing so the game plays and ends nominally, but gameState STILL doesn’t update accurately in draw.

What gives?

Code:
ofApp.h //
#pragma once

#include “ofMain.h”

class ofApp : public ofBaseApp{

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

	ofPoint Point[8];
	ofColor Color[8];
	ofRectangle Box[9];
	ofRectangle Player;

	float vel[8];

	int width = 50;
	int height = 50;

	int turnAround[8];
	int gameState;

	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);

};

ofApp.cpp //
#include “ofApp.h”

//--------------------------------------------------------------
void ofApp::setup(){
gameState = 0;

for (int i = 0; i < 8; i++) {
	Point[i].set(500, 100 * i);
	Color[i].set(0, rand() % 256, rand() % 256);
	Box[i].set(Point[i], width, height);
	vel[i] = ((rand() % 40) - 20)+.1;
	turnAround[i] = 1;
}

Player.set(500, 900, width, height);

}

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

}

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

for (int i = 0; i < 8; i++) {
	if (Player.intersects(Box[i]) == true) {
		gameState = 1;
		cout << gameState;

		for (int j = 0; j < 8; i++) {
			vel[j] = 0;
		}
	}
	else if (Player.intersects(Box[i]) == false) {

		if (Point[i].x < 1000) {
			Point[i].x += vel[i] * turnAround[i];
		}

		if (Point[i].x > 1000) {
			turnAround[i] *= -1;
			Point[i].x += vel[i] * turnAround[i];
		}

		if (Point[i].x < 0) {
			turnAround[i] *= -1;
			Point[i].x += vel[i] * turnAround[i];
		}
	}

}

if (gameState == 0) {
	for (int i = 0; i < 8; i++) {
		Box[i].x = Point[i].x;
	}
	for (int i = 0; i < 8; i++) {
		ofSetColor(Color[i]);
		ofDrawRectangle(Box[i]);
	}

	ofSetColor(255, 0, 0);
	ofDrawRectangle(Player);
}

// cout << gameState;

if (gameState == 1) {
	for (int i = 0; i < 8; i++) {
		Box[i].x = Point[i].x;
	}
	ofSetColor(255, 255, 255);
	ofDrawRectangle(0, 0, 1000, 1000);
	ofSetColor(0, 0, 0);
	ofDrawBitmapString("Game Over!", 500, 500);
}

}

//--------------------------------------------------------------
void ofApp::keyPressed(int key){
if (key == OF_KEY_UP) {
Player.y -= 50;
}
else if (key == OF_KEY_DOWN) {
Player.y += 50;
}
}

//--------------------------------------------------------------
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){

}

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