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                <div id="app">
  <div>{{ message}}</div>
  <!-- Canvas -->
  <div id="zim"></div>
  <!-- Add Rectangle Button -->
    <button @click="drawRect">Add Rect</button>
    <button @click="subWidth">-</button>
    <button @click="addWidth">+</button>


                #app {
  padding: 20px;
  margin: 20px;



                    const app = new Vue({
        el: '#app',
        data: {
            message: 'Vue + ZIM',
            rectWidth: 200
        mounted() {
            // store a reference to vue for inside the ZIM Frame
            const vue = this;
            const frame = new Frame("zim", 300, 200, yellow);
            frame.on("ready", ()=>{
                // store refrerences to the stage and rect 
                // so VUE can access them from its methods
                // store local variables if we want to access them in the ZIM code
                const stage = vue.stage = frame.stage;   
                // we do not add the rect yet - as there is a VUE button to do that
                // access the VUE rectWidth data
                const rect = vue.rect = new Rectangle(vue.rectWidth, 150, purple);               
                stage.update(); // if there was something to update - which there is not in this simple example
        methods: {
            drawRect() {
            addWidth() {
                // widthOnly is the ZIM property 
                // setting width would proportially set the height 
                this.rect.widthOnly += 10;
      ; // optional
            subWidth() {
                this.rect.widthOnly -= 10;