Added graph_imported_curves module for import curves

Author: demvlad

src/graph_imported_curves.js

@@ -0,0 +1,75 @@
+export function ImportedCurves(curvesChanged) {
+  const maxImportCount = 5;
+  this._curvesData = [];
+  let _that = this;
+  this.minX = Number.MAX_VALUE;
+  this.maxX = -Number.MAX_VALUE;
+  this.minY = Number.MAX_VALUE;
+  this.maxY = -Number.MAX_VALUE;
+  
+  this.curvesCount = function() {
+    return this._curvesData.length;
+  }
+
+  this.importCurvesFromCSV = function(files) {
+      let importsLeft = maxImportCount - this._curvesData.length;
+
+      for (const file of files) {
+        if (importsLeft-- == 0) {
+          break;
+        }
+        const reader = new FileReader();
+        reader.onload = function (e) {
+          try {
+            const stringRows = e.target.result.split("\n");
+
+            const header = stringRows[0].split(",");
+            if (header.length != 2 || header[0] != "x" || header[1] != "y") {
+              throw new SyntaxError("Wrong curves CSV data format");
+            }
+
+            stringRows.shift();
+            //remove bad last row
+            if (stringRows.at(-1) == "") {
+              stringRows.pop();
+            }
+
+            const curvesData = stringRows.map( function(row) {
+              const data = row.split(","),
+                    x = parseFloat(data[0]),
+                    y = parseFloat(data[1]);
+              _that.minX = Math.min(x, _that.minX);
+              _that.maxX = Math.max(x, _that.maxX);
+              _that.minY = Math.min(y, _that.minY);
+              _that.maxY = Math.max(y, _that.maxY);
+              return {
+                x: x,
+                y: y,
+              };
+            });
+
+            const curve = {
+              name: file.name.split('.')[0],
+              points: curvesData,
+            };
+            _that._curvesData.push(curve);
+            curvesChanged();
+          } catch (e) {
+            alert('Curves data import error: ' + e.message);
+            return;
+          }
+        };
+
+        reader.readAsText(file);
+      }
+    };
+
+  this.removeCurves = function() {
+    this._curvesData.length = 0;
+    this.minX = Number.MAX_VALUE;
+    this.maxX = -Number.MAX_VALUE;
+    this.minY = Number.MAX_VALUE;
+    this.maxY = -Number.MAX_VALUE;
+    curvesChanged();
+  }
+}