App doesn't auto clear every frame

beginners
#1

Hi all, I am a beginner to OF, i am currently following this tutorial series on youtube:

In this particular short episode, it teaches how to draw an image and have it follow your mouse cursor. I followed the steps but instead of the image following my mouse cursor, it now duplicates and creates one instance every frame on my cursor’s xy coordinates.

 void ofApp::draw(){
	image.draw(ofGetMouseX(), ofGetMouseY());
}

I tried searching the forums, google, and can’t find anything on this(maybe wrong terminology?). I even tried using

ofSetBackgroundAuto(true);

on setup() but it doesn’t do anything. the image is a png. On OF_WINDOW the entire canvas kept blinking like its trying to refresh every frame but the duplicated images remained. On OF_FULLSCREEN the images remains on the screen. Any help would be appreciated. Thanks!

main.ccp below:

#include "ofApp.h"

//========================================================================
int main( ){
	ofSetupOpenGL(1920,1080, OF_FULLSCREEN);			// <-------- setup the GL context

	// this kicks off the running of my app
	// can be OF_WINDOW or OF_FULLSCREEN
	// pass in width and height too:
	ofRunApp(new ofApp());

}

ofApp.ccp below:

#include "ofApp.h"

//--------------------------------------------------------------
void ofApp::setup(){
	image.load("image.png");
}

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

}

//--------------------------------------------------------------
void ofApp::draw(){
	image.draw(ofGetMouseX(), ofGetMouseY());
}

ofApp.h below:

#pragma once

#include "ofMain.h"

class ofApp : public ofBaseApp{

	public:
		void setup();
		void update();
		void draw();
		
	ofImage image;
};

There are no other codes, these are everything inside. I commented out the other default functions. No errors.

#2

Could you post here the whole code? ofApp.h and ofApp.cpp?

#3

ofApp.ccp

#include "ofApp.h"

//--------------------------------------------------------------
void ofApp::setup(){
	image.load("image.png");
}

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

}

//--------------------------------------------------------------
void ofApp::draw(){
	image.draw(ofGetMouseX(), ofGetMouseY());
}

ofApp.h

#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);*/
		
	ofImage image;
};
#4

This code works to me, as expected. I have tried it with OF_FULLSCREEN and OF_WINDOW mode and both works.
On which platform are you? are you using the last version of OF? the 0.10 one?

#5

I think it should be the latest one since I downloaded it here:
https://openframeworks.cc/download/

I use visual studios. Does your image move around like in the tutorial video? Mine creates duplicates every frame according to the mouse x/y.

Untitled-1
Untitled-1.jpg959×540 152 KB

#6

My image move around like in the tutorial. Can someone on windows confirm this behaviour?

When did you download OF? some weeks ago or 5 months ago?

#7

I downloaded it just yesterday. Newbie question, does the canvas clear itself every frame by default?

#8

yes, it autoclears everyframe.

#9

Bump, im still stuck at this problem, any help would be appreciated.

#10

this sounds like a problem with your graphics card driver or something like that, can you try updating it? also what graphics card do you have?

#11

Im using a laptop with Intel Geforce 940MX. Is there a list of compatible or incompatible graphics card?

On a side note, I tried installing visual studios and OF on my home pc, and I wrote the same 3 lines of code,

ofImage image;

image.load();

image.draw();

And it worked perfectly as per the tutorial without duplicates. So Im not too sure if theres something that I missed, or project generator settings, or visual studios settings. If anyone has any idea how to troubleshoot pls I still need help! Thanks!

#12

Sorry I double posted for this, I thought I should make a new post of the actual answer. While typing up the above I took arturo’s advice and updated my graphics driver. turns out that solved the issue. Credits to arturo and edapx for helping out!