laser-poiner script for mouse

examples/pointer.js

@@ -0,0 +1,76 @@
+
+var lineEntityID = null;
+var lineIsRezzed = false;
+
+
+function nearLinePoint(targetPosition) {
+    var handPosition = MyAvatar.getRightPalmPosition();
+    var along = Vec3.subtract(targetPosition, handPosition);
+    along = Vec3.normalize(along);
+    along = Vec3.multiply(along, 0.4);
+    return Vec3.sum(handPosition, along);
+}
+
+
+function removeLine() {
+    if (lineIsRezzed) {
+        Entities.deleteEntity(lineEntityID);
+        lineEntityID = null;
+        lineIsRezzed = false;
+    }
+}
+
+
+function createOrUpdateLine(event) {
+    var pickRay = Camera.computePickRay(event.x, event.y);
+    var intersection = Entities.findRayIntersection(pickRay, true); // accurate picking
+
+    if (lineIsRezzed) {
+        Entities.editEntity(lineEntityID, {
+            position: nearLinePoint(intersection.intersection),
+            dimensions: Vec3.subtract(intersection.intersection, nearLinePoint(intersection.intersection)),
+            lifetime: 30 // renew lifetime
+    });
+
+    } else {
+        lineIsRezzed = true;
+        lineEntityID = Entities.addEntity({
+            type: "Line",
+            position: nearLinePoint(intersection.intersection),
+            dimensions: Vec3.subtract(intersection.intersection, nearLinePoint(intersection.intersection)),
+            color: { red: 255, green: 255, blue: 255 },
+            lifetime: 30 // if someone crashes while pointing, don't leave the line there forever.
+        });
+    }
+}
+
+
+function mousePressEvent(event) {
+    if (!event.isLeftButton) {
+        return;
+    }
+    if (lineIsRezzed) {
+        return;
+    }
+    createOrUpdateLine(event);
+    if (lineIsRezzed) {
+        Controller.mouseMoveEvent.connect(mouseMoveEvent);
+    }
+ }
+
+
+function mouseMoveEvent(event) {
+    createOrUpdateLine(event);
+}
+
+
+function mouseReleaseEvent() {
+    if (lineIsRezzed) {
+        Controller.mouseMoveEvent.disconnect(mouseMoveEvent);
+    }
+    removeLine();
+}
+
+
+Controller.mousePressEvent.connect(mousePressEvent);
+Controller.mouseReleaseEvent.connect(mouseReleaseEvent);