Fix igc example migrating map postcompose event

examples/feature-animation.js

@@ -72,7 +72,7 @@ function flash(feature) {
       unByKey(listenerKey);
       return;
     }
-    // tell OpenLayers to continue postcompose animation
+    // tell OpenLayers to continue postrender animation
     map.render();
   }
 }

examples/feature-move-animation.js

@@ -161,7 +161,7 @@ const moveFeature = function(event) {
     const feature = new Feature(currentPoint);
     vectorContext.drawFeature(feature, styles.geoMarker);
   }
-  // tell OpenLayers to continue the postcompose animation
+  // tell OpenLayers to continue the postrender animation
   map.render();
 };
 

examples/layer-spy.html

@@ -5,7 +5,7 @@ shortdesc: View a portion of one layer over another
 docs: >
   <p>Layer rendering can be manipulated in <code>prerender</code> and <code>postrender</code> event listeners.
   These listeners get an event with a reference to the Canvas rendering context.
-  In this example, the <code>precompose</code> listener sets a clipping mask around the most
+  In this example, the <code>prerender</code> listener sets a clipping mask around the most
   recent mouse position, giving you a spyglass effect for viewing one layer over another.</p>
   <p>Move around the map to see the effect.  Use the ↑ up and ↓ down arrow keys to adjust the spyglass size.</p>
 tags: "spy, image manipulation"

examples/synthetic-points.js

@@ -5,6 +5,7 @@ import {LineString, Point} from '../src/ol/geom.js';
 import VectorLayer from '../src/ol/layer/Vector.js';
 import VectorSource from '../src/ol/source/Vector.js';
 import {Circle as CircleStyle, Fill, Stroke, Style} from '../src/ol/style.js';
+import {getVectorContext} from '../src/ol/render';
 
 
 const count = 20000;
@@ -104,8 +105,8 @@ const style = new Style({
   })
 });
 
-map.on('postcompose', function(evt) {
+vector.on('postrender', function(evt) {
-  const vectorContext = evt.vectorContext;
+  const vectorContext = getVectorContext(evt);
   vectorContext.setStyle(style);
   if (point !== null) {
     vectorContext.drawGeometry(point);