fix(touch): Allow for multi-touch in OHIF (#5099)

modes/segmentation/src/initToolGroups.ts

@@ -16,8 +16,14 @@ function createTools(utilityModule) {
     active: [
       { toolName: toolNames.WindowLevel, bindings: [{ mouseButton: Enums.MouseBindings.Primary }] },
       { toolName: toolNames.Pan, bindings: [{ mouseButton: Enums.MouseBindings.Auxiliary }] },
-      { toolName: toolNames.Zoom, bindings: [{ mouseButton: Enums.MouseBindings.Secondary }] },
-      { toolName: toolNames.StackScroll, bindings: [{ mouseButton: Enums.MouseBindings.Wheel }] },
+      {
+        toolName: toolNames.Zoom,
+        bindings: [{ mouseButton: Enums.MouseBindings.Secondary }, { numTouchPoints: 2 }],
+      },
+      {
+        toolName: toolNames.StackScroll,
+        bindings: [{ mouseButton: Enums.MouseBindings.Wheel }, { numTouchPoints: 3 }],
+      },
     ],
     passive: [
       {
@@ -178,7 +184,7 @@ function initVolume3DToolGroup(extensionManager, toolGroupService) {
       },
       {
         toolName: toolNames.Zoom,
-        bindings: [{ mouseButton: Enums.MouseBindings.Secondary }],
+        bindings: [{ mouseButton: Enums.MouseBindings.Secondary }, { numTouchPoints: 2 }],
       },
       {
         toolName: toolNames.Pan,