diff --git a/src/placing.js b/src/placing.js
index 5e227a8..dddc3d0 100644
--- a/src/placing.js
+++ b/src/placing.js
@@ -92,23 +92,33 @@ module.exports = (options) => {
      * @returns {boolean}
      */
     nodeBetween: (nodes, n1, n2) => {
-      const x1 = nodes[n1].x;
-      const y1 = nodes[n1].y;
-      const x2 = nodes[n2].x;
-      const y2 = nodes[n2].y;
+      let x1 = nodes[n1].x;
+      let y1 = nodes[n1].y;
+      let x2 = nodes[n2].x;
+      let y2 = nodes[n2].y;
 
-      const dx = Math.sign(x2 - x1);
-      const dy = Math.sign(y2 - y1);
+      const dx = x2 - x1;
+      const dy = y2 - y1;
 
       const samePos = (x, y) => n => n.x === x && n.y === y && n.name !== n1 && n.name !== n2;
 
-      if (dx >= dy) {
+      if (Math.abs(dx) >= Math.abs(dy)) {
+        if (x1 > x2) {
+          let tmp = x1;
+          x1 = x2;
+          x2 = tmp;
+        }
         for (let x = x1; x <= x2; x++) {
           let y = Math.round(y1 + dy * (x - x1) / dx);
           if (Object.values(nodes).find(samePos(x, y)))
             return true;
         }
       } else {
+        if (y1 > y2) {
+          let tmp = y1;
+          y1 = y2;
+          y2 = tmp;
+        }
         for (let y = y1; y <= y2; y++) {
           let x = Math.round(x1 + dx * (y - y1) / dy);
           if (Object.values(nodes).find(samePos(x, y)))
@@ -368,9 +378,14 @@ module.exports = (options) => {
 
       nodes = self.applyLinks(nodes, links);
 
-      if (nodes)
+      if (nodes) {
         self.correctPlacing(nodes);
 
+        Object.values(nodes).forEach(node => {
+          delete node.const;
+        });
+      }
+
       return nodes;
     },
 
diff --git a/test/placing.test.js b/test/placing.test.js
index e594c3c..8ef582a 100644
--- a/test/placing.test.js
+++ b/test/placing.test.js
@@ -112,6 +112,17 @@ describe('nodeBetween', () => {
     }, 'a', 'b');
     expect(res).toBe(true);
   });
+  test('between diagonal 3', () => {
+    const res = placing({debug: true}).nodeBetween({
+      '1': {'name': '1', 'x': 1, 'y': 0},
+      '2': {'name': '2', 'x': 2, 'y': 0},
+      '3': {'name': '3', 'x': 1, 'y': 1},
+      '4': {'name': '4', 'x': 2, 'y': 1},
+      '5': {'name': '5', 'x': 0, 'y': 0},
+      '6': {'name': '6', 'x': 0, 'y': 1}
+    }, '4', '5');
+    expect(res).toBe(true);
+  });
 });
 
 describe('getPosition', () => {
@@ -347,6 +358,65 @@ describe('isValid', () => {
   });
 });
 
+describe('correctPlacing', () => {
+  test('no nodes', () => {
+    const nodes = {};
+    placing({debug: true}).correctPlacing(nodes);
+    expect(nodes).toEqual({});
+  });
+  test('several nodes', () => {
+    const nodes = {
+      'a': {x: 3, y: 2},
+      'b': {x: -2, y: 5},
+      'c': {x: -4, y: 3}
+    };
+    placing({debug: true}).correctPlacing(nodes);
+    expect(nodes).toEqual({
+      'a': {x: 7, y: 0},
+      'b': {x: 2, y: 3},
+      'c': {x: 0, y: 1}
+    });
+  });
+});
+
+describe('compute', () => {
+  const createNodes = (n) => {
+    const nodes = {};
+    new Array(n).fill(0).forEach((u, i) => nodes['' + (i + 1)] = {name: '' + (i + 1)});
+    return nodes;
+  };
+
+  test('no nodes', () => {
+    const nodes = placing({'max-link-length': 2, 'expand': 'h', diagonals: false}).compute({}, []);
+    expect(nodes).toEqual({});
+  });
+  test('3 nodes no link', () => {
+    const nodes = placing({'max-link-length': 2, 'expand': 'h', diagonals: false}).compute(createNodes(3), []);
+    expect(nodes).toEqual({
+      '1': {name: '1', x: 0, y: 0},
+      '2': {name: '2', x: 1, y: 0},
+      '3': {name: '3', x: 2, y: 0}
+    });
+  });
+  test('6 nodes 6 links', () => {
+    const nodes = placing({'max-link-length': 2, 'expand': 'h', diagonals: true}).compute(createNodes(6), [
+      {from: '1', to: '2', direction: 'right'},
+      {from: '1', to: '3', direction: 'down'},
+      {from: '3', to: '4', direction: 'right'},
+      {from: '4', to: '5', direction: 'up'},
+      {from: '3', to: '6', direction: 'left'}
+    ]);
+    expect(nodes).toEqual({
+      '1': {name: '1', x: 1, y: 1},
+      '2': {name: '2', x: 2, y: 1},
+      '3': {name: '3', x: 1, y: 2},
+      '4': {name: '4', x: 3, y: 1},
+      '5': {name: '5', x: 3, y: 0},
+      '6': {name: '6', x: 0, y: 2}
+    });
+  });
+});
+
 test('no debug (coverage)', () => {
   placing({'max-link-length': 2, 'expand': 'h', diagonals: false}).compute({
     '1': {name: '1'}, '2': {name: '2'}, '3': {name: '3'}, '4': {name: '4'}, '5': {name: '5'}, '6': {name: '6'}