Merge pull request #505 from agirault/manipulators-improvement

SliceManipulator and ImageMapper improvements

Author: jourdain

Sources/Interaction/Manipulators/SliceManipulator/index.js

@@ -0,0 +1,109 @@
+import macro from 'vtk.js/Sources/macro';
+import vtkCameraManipulator from 'vtk.js/Sources/Interaction/Manipulators/CameraManipulator';
+import vtkMath from 'vtk.js/Sources/Common/Core/Math';
+
+// ----------------------------------------------------------------------------
+// vtkSliceManipulator methods
+// ----------------------------------------------------------------------------
+
+function vtkSliceManipulator(publicAPI, model) {
+  // Set our className
+  model.classHierarchy.push('vtkSliceManipulator');
+
+  publicAPI.onAnimation = (interactor, renderer) => {
+    const lastPtr = interactor.getPointerIndex();
+    const pos = interactor.getAnimationEventPosition(lastPtr);
+    const lastPos = interactor.getLastAnimationEventPosition(lastPtr);
+
+    if (!pos || !lastPos || !renderer) {
+      return;
+    }
+
+    const dy = pos.y - lastPos.y;
+
+    const camera = renderer.getActiveCamera();
+    const range = camera.getClippingRange();
+    let distance = camera.getDistance();
+
+    // scale the interaction by the height of the viewport
+    let viewportHeight = 0.0;
+    if (camera.getParallelProjection()) {
+      viewportHeight = camera.getParallelScale();
+    } else {
+      const angle = vtkMath.radiansFromDegrees(camera.getViewAngle());
+      viewportHeight = 2.0 * distance * Math.tan(0.5 * angle);
+    }
+
+    const size = interactor.getView().getViewportSize(renderer);
+    const delta = dy * viewportHeight / size[1];
+    distance += delta;
+
+    // clamp the distance to the clipping range
+    if (distance < range[0]) {
+      distance = range[0] + viewportHeight * 1e-3;
+    }
+    if (distance > range[1]) {
+      distance = range[1] - viewportHeight * 1e-3;
+    }
+    camera.setDistance(distance);
+  };
+
+  publicAPI.onPinch = (interactor) => {
+    const interactorStyle = interactor.getInteractorStyle();
+    let renderer = interactorStyle.getCurrentRenderer();
+
+    if (!renderer) {
+      const pos = interactor.getAnimationEventPosition(
+        interactor.getPointerIndex()
+      );
+      renderer = interactor.findPokedRenderer(pos);
+      if (!renderer) {
+        return;
+      }
+    }
+
+    let delta = interactor.getScale() / interactor.getLastScale();
+    delta = 1.0 - delta;
+    delta *= 25; // TODO: expose factor?
+
+    const camera = renderer.getActiveCamera();
+    const range = camera.getClippingRange();
+    let distance = camera.getDistance();
+    distance += delta;
+
+    // clamp the distance to the clipping range
+    if (distance < range[0]) {
+      distance = range[0];
+    }
+    if (distance > range[1]) {
+      distance = range[1];
+    }
+    camera.setDistance(distance);
+  };
+}
+
+// ----------------------------------------------------------------------------
+// Object factory
+// ----------------------------------------------------------------------------
+
+const DEFAULT_VALUES = {};
+
+// ----------------------------------------------------------------------------
+
+export function extend(publicAPI, model, initialValues = {}) {
+  Object.assign(model, DEFAULT_VALUES, initialValues);
+
+  // Inheritance
+  vtkCameraManipulator.extend(publicAPI, model, initialValues);
+
+  // Object specific methods
+  vtkSliceManipulator(publicAPI, model);
+}
+
+// ----------------------------------------------------------------------------
+
+export const newInstance = macro.newInstance(extend, 'vtkSliceManipulator');
+
+// ----------------------------------------------------------------------------
+
+export default Object.assign({ newInstance, extend });

Sources/Interaction/Manipulators/index.js

@@ -1,4 +1,5 @@
 import vtkCameraManipulator from './CameraManipulator';
+import vtkSliceManipulator from './SliceManipulator';
 import vtkTrackballMultiRotate from './TrackballMultiRotate';
 import vtkTrackballPan from './TrackballPan';
 import vtkTrackballRoll from './TrackballRoll';
@@ -8,6 +9,7 @@ import vtkTrackballZoomToMouse from './TrackballZoomToMouse';
 
 export default {
   vtkCameraManipulator,
+  vtkSliceManipulator,
   vtkTrackballMultiRotate,
   vtkTrackballPan,
   vtkTrackballRoll,

Sources/Rendering/Core/ImageMapper/example/index.js

@@ -37,6 +37,7 @@ const iStyle = vtkInteractorStyleImage.newInstance();
 iStyle.setInteractionMode('IMAGE_SLICING');
 renderWindow.getInteractor().setInteractorStyle(iStyle);
 
+renderer.getActiveCamera().setParallelProjection(true);
 renderer.addActor(actor);
 renderer.resetCamera();
 renderWindow.render();

Sources/Rendering/Core/ImageMapper/index.js

@@ -16,12 +16,38 @@ function vtkImageMapper(publicAPI, model) {
   // Set our className
   model.classHierarchy.push('vtkImageMapper');
 
-  publicAPI.setZSliceFromCamera = (cam) => {
+  publicAPI.setSliceFromCamera = (cam) => {
     const image = publicAPI.getInputData();
     const fp = cam.getFocalPoint();
     const idx = [];
     image.worldToIndex(fp, idx);
-    publicAPI.setZSlice(Math.floor(idx[2] + 0.5));
+
+    let id = 0;
+    const bds = publicAPI.getBounds();
+    switch (publicAPI.getCurrentSlicingMode()) {
+      case SlicingMode.X:
+        id = idx[0];
+        id = Math.floor(id + 0.5);
+        id = Math.min(id, bds[1]);
+        id = Math.max(id, bds[0]);
+        publicAPI.setXSlice(id);
+        break;
+      case SlicingMode.Y:
+        id = idx[1];
+        id = Math.floor(id + 0.5);
+        id = Math.min(id, bds[3]);
+        id = Math.max(id, bds[2]);
+        publicAPI.setYSlice(id);
+        break;
+      case SlicingMode.Z:
+        id = idx[2];
+        id = Math.floor(id + 0.5);
+        id = Math.min(id, bds[5]);
+        id = Math.max(id, bds[4]);
+        publicAPI.setZSlice(id);
+        break;
+      default:
+    }
   };
 
   publicAPI.setZSliceIndex = (id) => {

Sources/Rendering/OpenGL/ImageMapper/index.js

@@ -46,9 +46,9 @@ function vtkOpenGLImageMapper(publicAPI, model) {
       model.openGLCamera = model.openGLRenderer.getViewNodeFor(
         ren.getActiveCamera()
       );
-      // is zslice set by the camera
+      // is slice set by the camera
       if (model.renderable.getSliceAtFocalPoint()) {
-        model.renderable.setZSliceFromCamera(ren.getActiveCamera());
+        model.renderable.setSliceFromCamera(ren.getActiveCamera());
       }
     }
   };