Account for corner points detection

test/tests.js

@@ -5,7 +5,7 @@
 console.log("RUNNING JSCANIFY TESTS");
 console.log("Warning: This may take a bit");
 
-const { loadImage } = require("canvas");
+const { loadImage, createCanvas } = require("canvas");
 const { mkdirSync, writeFileSync, unlinkSync, existsSync } = require("fs");
 const assert = require("assert");
 
@@ -15,6 +15,7 @@ const path = require("path");
 const outputPaths = {
   highlight: __dirname + "/output/highlighted.jpg",
   extracted: __dirname + "/output/extracted.jpg",
+  cornerPoints: __dirname + "/output/corner_points.jpg",
 };
 
 const baseFolder = __dirname.replaceAll("\\", "/") + "/output/";
@@ -50,7 +51,7 @@ function test() {
   scanner.loadOpenCV(function (cv) {
     console.log("Finished loading OpenCV.js");
     console.log("Writing test images to: " + baseFolder);
-    describe("feature tests", function (done) {
+    describe("feature tests", function () {
       it("should highlight paper", function (done) {
         const highlighted = scanner.highlightPaper(testImage);
         writeFileSync(
@@ -73,6 +74,41 @@ function test() {
           done();
         });
       });
+
+      it("should label corner points", function (done) {
+        const parsedImage = cv.imread(testImage);
+        const paperContour = scanner.findPaperContour(parsedImage);
+        const {
+          topLeftCorner,
+          topRightCorner,
+          bottomLeftCorner,
+          bottomRightCorner,
+        } = scanner.getCornerPoints(paperContour, testImage);
+
+        const canvas = createCanvas();
+
+        cv.imshow(canvas, parsedImage);
+        const ctx = canvas.getContext("2d");
+        const points = [
+          { p: topLeftCorner, text: "top left corner" },
+          { p: topRightCorner, text: "top right corner" },
+          { p: bottomLeftCorner, text: "bottom left corner" },
+          { p: bottomRightCorner, text: "bottom right corner" },
+        ];
+        ctx.fillStyle = "cyan";
+        ctx.font = "25px serif";
+        points.forEach(({ p: point, text }) => {
+          ctx.beginPath();
+          ctx.arc(point.x, point.y, 15, 0, 2 * Math.PI, false);
+          ctx.fillText(text, point.x + 30, point.y)
+          ctx.fill();
+        });
+
+        writeFileSync(outputPaths.cornerPoints, canvas.toBuffer("image/jpeg"));
+
+        assert.ok(existsSync(outputPaths.cornerPoints));
+        done();
+      });
     });
   });
 }