diff --git a/packages/graphics/stage.js b/packages/graphics/stage.js
index 7597636..c175714 100644
--- a/packages/graphics/stage.js
+++ b/packages/graphics/stage.js
@@ -146,6 +146,7 @@ export class Stage extends Container {
     // Precalc the transformation ratio and apply it to the UI layer.
     this._transformRatio = this.size[0] / this.element.clientWidth;
     this.ui.style.transform = `scale(${1 / this._transformRatio})`;
+    this.emit('displaySizeChanged', this.displaySize);
   }
 
   render() {