ImGui responsive 3 columns layout (ofx based example)

imgui_responsive_three_columns_layout.cpp

#include "ofApp.h"

//--------------------------------------------------------------
void ofApp::setup(){
    gui.setup();
    backgroundColor = ofColor(0, 0, 0);
}

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

}

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

void ofApp::draw(){
    ofSetBackgroundColor(backgroundColor);
    gui.begin();
    
    ImGui::SetNextWindowPos(ImVec2(0,0));
    ImGui::SetNextWindowSize(ImVec2(ofGetWindowWidth()/4.0f, Viewport->Size.y));
    if (ImGui::Begin("Left Window", NULL, ImGuiWindowFlags_NoMove | ImGuiWindowFlags_NoResize))
    {
        ImGui::TextUnformatted("Text");
    }
    ImGui::End();
    
    ImGui::SetNextWindowPos(ImVec2(ofGetWindowWidth()/4.0f,0));
    ImGui::SetNextWindowSize(ImVec2(ofGetWindowWidth()/2.0f, Viewport->Size.y));
    if (ImGui::Begin("Center Window", NULL, ImGuiWindowFlags_NoMove | ImGuiWindowFlags_NoResize))
    {
        ImGui::TextUnformatted("Text");
    }
    ImGui::End();
    
    ImGui::SetNextWindowPos(ImVec2((ofGetWindowWidth()/4.0f)*3,0));
    ImGui::SetNextWindowSize(ImVec2(ofGetWindowWidth()/4.0f, Viewport->Size.y));
    if (ImGui::Begin("Right Window", NULL, ImGuiWindowFlags_NoMove | ImGuiWindowFlags_NoResize))
    {
        ImGui::TextUnformatted("Text");
    }
    ImGui::End();
    
    gui.end();
}

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

}

//--------------------------------------------------------------
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){
    int minWidth = 1024;
    int minHeight = 768;
    
    if(w < minWidth || h < minHeight)
    {
        ofSetWindowShape(minWidth, minHeight);
    }
}

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

}

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

}