From 6f4bd85e1c0ef042385d0b88634add5dd3502660 Mon Sep 17 00:00:00 2001
From: rsdexter <rsdexter00@gmail.com>
Date: Mon, 27 Apr 2020 14:40:07 -0400
Subject: [PATCH] erasure deletes the selection properly when given the ID and
 creates a new step

---
 src/canvas/Canvas.js | 41 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)

diff --git a/src/canvas/Canvas.js b/src/canvas/Canvas.js
index 1b8b204..27a1f20 100644
--- a/src/canvas/Canvas.js
+++ b/src/canvas/Canvas.js
@@ -86,6 +86,15 @@ class Canvas extends React.Component {
         },
         erase: (id) => {
           console.log("ERASURE")
+          let successful = this.erasure(id);
+          if (successful)
+            this.setState({ 
+              highlights: {
+                cut: 'none', 
+                var: 'none'
+              },
+              interaction: true, 
+              cbFunction: null });
         },
         iterate: (id) => {
           console.log("ITERATION")
@@ -131,6 +140,38 @@ class Canvas extends React.Component {
     });
   }
 
+  erasure(id) {
+    let { steps, currentStep, data } = this.state;
+    // Create a new step
+    let step = this.copyStep(steps[currentStep]);
+    // Find the data that will be erased
+    let erased = this.findID(step, id);
+    console.log(erased)
+    if (!erased) {
+      console.log("Selection ID not found for Erasure.")
+      return false;
+    }
+    // Get the parent of the erased section
+    let parent = this.findParent(step, id)
+    if (!parent) {
+      console.log("Parent of ID not found for Erasure.")
+      return false;
+    }
+    // Remove the erased data from the parent's data array
+    const index = parent.data.indexOf(erased);
+    if (index > -1)
+      parent.data.splice(index, 1);
+    else {
+      console.log("Selection not found under its parent.")
+      return false;
+    }
+    // Update the state
+    currentStep+=1;
+    steps.push(step);
+    this.setState({ steps: steps, currentStep: currentStep, data:data });
+    return true;
+  }
+
   /* Adds a double cut given the ID of the data that will be inside the cut.
   *  Will only run if the current step is the last step.
   */
-- 
2.51.2