Function definition is not allowed (making animation with multiple circles)

#1

Hello, I use Mac OS Catalina, and I’m a Japanese beginner, trying to figure out how to use OpenFrameworks using a textbook published 4 years ago.

I am sorry if my English may not be good enough to explain what my problem is, but I hope someone can help me out…!

I am trying to make an animation with multiple circles, but Xcode says “function definition is not allowed here” in
section such as

App::update()

and other void of section, like ofApp::draw(), ofApp::keyPressed( int key) and so on.

This started to happen after using the formula

static const int NUM = 100;

but I’m not sure if this is the cause , or if the textbook I’m using is too old… Here is my code.

#include "ofApp.h"

static const int NUM = 100;

float loc_x[NUM];

float loc_y[NUM];

float speed_x[NUM];

float speed_y[NUM];

//--------------------------------------------------------------

void ofApp::setup()

{

ofBackground(0, 0, 0);

ofSetFrameRate(30);

ofSetCircleResolution(64);

ofEnableAlphaBlending();

int i;

for(i=0; i<100; i++){

loc_x[i]=ofRandom(0, ofGetWidth());

loc_y[i]=ofRandom(0, ofGetHeight());

speed_x[i]=ofRandom(-10,10)+5;

speed_y[i]=ofRandom(-10,10)+10;

}

//--------------------------------------------------------------

void ofApp::update(){

for (i=0; i<NUM; i++){

loc_x[i]=loc_x[i]+speed_x[i];

loc_y[i]=loc_y[i]+speed_y[i];

if (loc_x[i]<0){speed_x[i]=speed_x[i]*-1;}

if (loc_x[i]>ofGetWidth()){speed_x[i]=speed_x[i]*-1;}

if(loc_y[i]<0){speed_y[i]=speed_y[i]*-1;}

if (loc_y[i]>ofGetHeight()){speed_y[i]=speed_y[i]*-1;}

}

}

//--------------------------------------------------------------

void ofApp::draw(){

ofSetColor(31, 63, 255, 127);

for ( int i=0; i<NUM; i++){

ofDrawCircle(loc_x[i], loc_y[i], 40);}

}

//--------------------------------------------------------------
![07|524x500](upload://qWNydWyQDY6naZgo23WNq4ICy3g.png)
#2

Hi,
you are missing a } at the end of ofApp::setup().
You get this error when you try to define a function inside another function, which often happens because you’re missing a closing curly bracket.

This is how it should be:


#include "ofApp.h"

static const int NUM = 100;

float loc_x[NUM];

float loc_y[NUM];

float speed_x[NUM];

float speed_y[NUM];

//--------------------------------------------------------------

void ofApp::setup()

{
	
	ofBackground(0, 0, 0);
	
	ofSetFrameRate(30);
	
	ofSetCircleResolution(64);
	
	ofEnableAlphaBlending();
	
	int i;
	
	for(i=0; i<100; i++){
		
		loc_x[i]=ofRandom(0, ofGetWidth());
		
		loc_y[i]=ofRandom(0, ofGetHeight());
		
		speed_x[i]=ofRandom(-10,10)+5;
		
		speed_y[i]=ofRandom(-10,10)+10;
		
	}
}
//--------------------------------------------------------------

void ofApp::update(){
	
	for (int i=0; i<NUM; i++){
		
		loc_x[i]=loc_x[i]+speed_x[i];
		
		loc_y[i]=loc_y[i]+speed_y[i];
		
		if (loc_x[i]<0){speed_x[i]=speed_x[i]*-1;}
		
		if (loc_x[i]>ofGetWidth()){speed_x[i]=speed_x[i]*-1;}
		
		if(loc_y[i]<0){speed_y[i]=speed_y[i]*-1;}
		
		if (loc_y[i]>ofGetHeight()){speed_y[i]=speed_y[i]*-1;}
		
	}
	
}

//--------------------------------------------------------------

void ofApp::draw(){
	
	ofSetColor(31, 63, 255, 127);
	
	for ( int i=0; i<NUM; i++){
		
		ofDrawCircle(loc_x[i], loc_y[i], 40);
	}
	
}
#3

Thank you so much, it mostly worked!!
I did miss to put a }… it cleared almost all the errors, except
<function definition is not allowed here>
is still here remaining at the

void ofApp::windowResized( int w, int h),
ofApp::gotMessage(ofMessage msg), 
ofApp::dragEvent(ofDragInfo dragInfo)

and also, expected '}' at the end.

void ofApp::windowResized( **int** w, **int** h){

}

//--------------------------------------------------------------

void ofApp::gotMessage(ofMessage msg){

}

//--------------------------------------------------------------

void ofApp::dragEvent(ofDragInfo dragInfo){ 

}

I feel sad that I have to bug you guys for such an elementary questions…
thank you for helping!!

#4

I deleted the space between the {} and the problem went away… Thank you for helping.