From 172d791a95126cbdb2ebf59fd8c28a63698002d1 Mon Sep 17 00:00:00 2001
From: eleanor-park <eleanor_park@brown.edu>
Date: Mon, 8 Apr 2024 23:20:18 -0400
Subject: radius erase re-implement started

---
 .../collectionFreeForm/CollectionFreeFormView.tsx  | 38 ++++++++++++++++++----
 1 file changed, 31 insertions(+), 7 deletions(-)

(limited to 'src/client/views/collections/collectionFreeForm/CollectionFreeFormView.tsx')

diff --git a/src/client/views/collections/collectionFreeForm/CollectionFreeFormView.tsx b/src/client/views/collections/collectionFreeForm/CollectionFreeFormView.tsx
index da4c53d66..26afa5297 100644
--- a/src/client/views/collections/collectionFreeForm/CollectionFreeFormView.tsx
+++ b/src/client/views/collections/collectionFreeForm/CollectionFreeFormView.tsx
@@ -1,4 +1,4 @@
-import { findSegment } from '@turf/turf';
+import { findSegment, intersect } from '@turf/turf';
 import { Bezier } from 'bezier-js';
 import { Colors } from 'browndash-components';
 import { action, computed, IReactionDisposer, makeObservable, observable, reaction, runInAction } from 'mobx';
@@ -755,8 +755,11 @@ export class CollectionFreeFormView extends CollectionSubView<Partial<collection
                     if (Doc.ActiveTool === InkTool.SegmentEraser) {
                         segments = this.segmentErase(intersect.inkView, intersect.t); // intersect.t is where the eraser intersected the ink stroke - want to remove the segment that starts at the intersection just before this t value and goes to the one just after it
                     } else if (Doc.ActiveTool === InkTool.RadiusEraser) {
-                        console.log("RADIUS");
-                        segments = this.radiusErase(intersect.inkView, intersect.t);
+                        const coords = this.props.ScreenToLocalTransform().inverse().transformPoint(e.clientX, e.clientY);
+                        const inkCoords = intersect.inkView.ComponentView?.ptFromScreen?.({X: coords[0], Y: coords[1]}); // coordinates in ink space
+                        if (inkCoords !== undefined) {
+                            segments = this.radiusErase(intersect.inkView, intersect.t, inkCoords);
+                        }
                     }
                         // } else if (Doc.ActiveTool === InkTool.RadiusEraser) {
                     //     segments = undefined;
@@ -840,16 +843,37 @@ export class CollectionFreeFormView extends CollectionSubView<Partial<collection
     };
 
     @action
-    radiusErase = (ink: DocumentView, eraseT: number): Segment[] => {
+    radiusErase = (ink: DocumentView, eraseT: number, inkCoords: {X: number, Y: number}): Segment[] => {
         const segments: Segment[] = [];
         var segment1: Segment = [];
         var segment2: Segment = [];
-        const eraseWidth = ActiveInkWidth() / 100;
-        const { inkData } = (ink?.ComponentView as InkingStroke).inkScaledData();
+        const eraseWidth = ActiveInkWidth();
+        const inkStroke = ink?.ComponentView as InkingStroke;
+        const { inkData } = (inkStroke).inkScaledData();
+
+        const eraserInkData = inkStroke.splitByEraser(inkCoords, eraseWidth) as InkData;
+
+        const tVals: number[] = []; // should be the tvals of the intersections
+
+        for (var i = 0; i < eraserInkData.length - 3; i += 4) {
+            const currCurveT = Math.floor(i/4);
+            const eraserBezier = InkField.Segment(eraserInkData, i);
+            for (var j = 0; j < inkData.length; j +=4) {
+            const inkSegment: Bezier = InkField.Segment(inkData, i);
+                this.bintersects(inkSegment, eraserBezier).forEach((val: string | number, i: number) => {
+                    // Converting the Bezier.js Split type to a t-value number.
+                    const t = +val.toString().split('/')[0];
+                    if (i % 2 === 0 && !tVals.includes(t)) tVals.push(t); // bcz: Hack!  don't know why but intersection points are doubled from bezier.js (but not identical).
+                });
+            }
+        }
+
         for (var i = 0; i < inkData.length - 3; i += 4) {
             const currCurveT = Math.floor(i/4);
             const inkSegment: Bezier = InkField.Segment(inkData, i);
-            if (eraseT >= currCurveT && eraseT < currCurveT+1) {
+            if (tVals[0] >= currCurveT && tVals[0] < currCurveT+1) {
+                tVals.shift()
+                i -= 4;
                 if (eraseT - eraseWidth > currCurveT && eraseT + eraseWidth < currCurveT + 1) {
                     segment1.push(inkSegment.split(0, eraseT - currCurveT - eraseWidth));
                     segment2.push(inkSegment.split(eraseT - currCurveT + eraseWidth, 1));
-- 
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