feat(core): add interpolate option to viewport transforming functions (#1851)

* chore(core): add d3-interpolate to deps

Signed-off-by: braks <78412429+bcakmakoglu@users.noreply.github.com>

* feat(core): add interpolate option to viewport transforming functions

Signed-off-by: braks <78412429+bcakmakoglu@users.noreply.github.com>

* chore(changeset): add

* feat(core): add interpolate option to viewport transforming functions

Signed-off-by: braks <78412429+bcakmakoglu@users.noreply.github.com>

---------

Signed-off-by: braks <78412429+bcakmakoglu@users.noreply.github.com>

packages/core/src/composables/useViewportHelper.ts

@@ -1,3 +1,4 @@
+import { interpolate, interpolateZoom } from 'd3-interpolate'
 import { zoomIdentity } from 'd3-zoom'
 import { computed } from 'vue'
 import type { D3Selection, GraphNode, Project, State, TransitionOptions, ViewportFunctions } from '../types'
@@ -48,7 +49,7 @@ export function useViewportHelper(state: State) {
   function zoom(scale: number, transitionOptions?: TransitionOptions) {
     return new Promise<boolean>((resolve) => {
       if (state.d3Selection && state.d3Zoom) {
-        state.d3Zoom.scaleBy(
+        state.d3Zoom.interpolate(transitionOptions?.interpolate === 'linear' ? interpolate : interpolateZoom).scaleBy(
           getD3Transition(state.d3Selection, transitionOptions?.duration, transitionOptions?.ease, () => {
             resolve(true)
           }),
@@ -68,7 +69,7 @@ export function useViewportHelper(state: State) {
       const nextTransform = zoomIdentity.translate(-clampedX, -clampedY).scale(zoom)
 
       if (state.d3Selection && state.d3Zoom) {
-        state.d3Zoom.transform(
+        state.d3Zoom?.interpolate(transitionOptions?.interpolate === 'linear' ? interpolate : interpolateZoom).transform(
           getD3Transition(state.d3Selection, transitionOptions?.duration, transitionOptions?.ease, () => {
             resolve(true)
           }),
@@ -99,7 +100,7 @@ export function useViewportHelper(state: State) {
       zoomTo: (zoomLevel, options) => {
         return new Promise<boolean>((resolve) => {
           if (state.d3Selection && state.d3Zoom) {
-            state.d3Zoom.scaleTo(
+            state.d3Zoom.interpolate(options?.interpolate === 'linear' ? interpolate : interpolateZoom).scaleTo(
               getD3Transition(state.d3Selection, options?.duration, options?.ease, () => {
                 resolve(true)
               }),

packages/core/src/types/zoom.ts

@@ -19,6 +19,7 @@ export enum PanOnScrollMode {
 export interface TransitionOptions {
   duration?: number
   ease?: (t: number) => number
+  interpolate?: 'smooth' | 'linear'
 }
 
 export type FitViewParams = {