Improved entropy collection canvas for touchscreens.

GlitchedPolygons · Dec 15, 2023 · 067917d · 067917d
1 parent 7a4ed8a
commit 067917d
Showing 1 changed file with 14 additions and 5 deletions.
diff --git a/GlitchedPolygons.GlitchEd25519.BlazorWebApp/Pages/Keygen.razor b/GlitchedPolygons.GlitchEd25519.BlazorWebApp/Pages/Keygen.razor
@@ -139,22 +139,31 @@
     configContext();
     
     const stopDrawing = () => 
-    { 
+    {
         isMouseDown = false; 
     }
     
     const startDrawing = event => 
     {
-       isMouseDown = true;   
-       [x, y] = [event.offsetX, event.offsetY];  
+        event.preventDefault();
+        
+        isMouseDown = true;   
+        
+        [x, y] = 
+        [
+            event.changedTouches ? event.changedTouches[0].clientX : event.offsetX, 
+            event.changedTouches ? event.changedTouches[0].clientY : event.offsetY
+        ];  
     }
     
     const drawLine = event => 
     {
+        event.preventDefault();
+        
         if (isMouseDown) 
         {
-            const newX = event.offsetX;
-            const newY = event.offsetY;
+            const newX = event.changedTouches ? event.changedTouches[0].clientX : event.offsetX;
+            const newY = event.changedTouches ? event.changedTouches[0].clientY : event.offsetY;
             
             context.beginPath();
             context.moveTo(x, y);