From 05876b546e5e6a93a61823600480839271e82bff Mon Sep 17 00:00:00 2001
From: Jason Park <parkjs814@gmail.com>
Date: Fri, 20 May 2016 04:28:04 -0500
Subject: [PATCH] able to zoom array2d&1d

---
 css/stylesheet.css   |  3 +-
 js/module/array1d.js |  1 -
 js/module/array2d.js | 70 ++++++++++++++++++++++++++++++++++++--------
 3 files changed, 58 insertions(+), 16 deletions(-)

diff --git a/css/stylesheet.css b/css/stylesheet.css
index a1e9683..43a4a19 100644
--- a/css/stylesheet.css
+++ b/css/stylesheet.css
@@ -136,7 +136,7 @@ section {
     bottom: 50%;
     left: 0;
     right: 0;
-    overflow: scroll;
+    overflow: hidden;
 }
 
 .tab_container {
@@ -245,7 +245,6 @@ pre {
 }
 
 .mtbl-cell {
-    padding: 3px 6px;
     display: table-cell;
     vertical-align: middle;
     text-align: center;
diff --git a/js/module/array1d.js b/js/module/array1d.js
index ca87481..069334b 100644
--- a/js/module/array1d.js
+++ b/js/module/array1d.js
@@ -12,7 +12,6 @@ Array1DTracer.prototype.createRandomData = function (N, min, max) {
 
 // Override
 Array1DTracer.prototype.setData = function (D) {
-    this.D = D;
     return Array2DTracer.prototype.setData.call(this, [D]);
 };
 
diff --git a/js/module/array2d.js b/js/module/array2d.js
index 3939de0..36442ef 100644
--- a/js/module/array2d.js
+++ b/js/module/array2d.js
@@ -3,6 +3,7 @@ var $table = null;
 function Array2DTracer(module) {
     if (Tracer.call(this, module || Array2DTracer)) {
         initTable();
+        initNavigator(this);
         return true;
     }
     return false;
@@ -45,12 +46,18 @@ Array2DTracer.prototype.setData = function (D) {
     this.D = D;
     if (Tracer.prototype.setData.call(this, arguments)) return true;
 
+    this.viewX = this.viewY = 0;
+    this.paddingH = 6;
+    this.paddingV = 3;
+    this.fontSize = 16;
     $table.empty();
     for (var i = 0; i < D.length; i++) {
         var $row = $('<div class="mtbl-row">');
         $table.append($row);
         for (var j = 0; j < D[i].length; j++) {
-            var $cell = $('<div class="mtbl-cell">').text(D[i][j]);
+            var $cell = $('<div class="mtbl-cell">')
+                .css(this.getCellCss())
+                .text(D[i][j]);
             $row.append($cell);
         }
     }
@@ -158,23 +165,22 @@ Array2DTracer.prototype.processStep = function (step, options) {
     }
 };
 
+Array2DTracer.prototype.getCellCss = function () {
+    return {
+        padding: this.paddingV + 'px ' + this.paddingH + 'px',
+        'font-size': this.fontSize
+    };
+};
+
 // Override
 Array2DTracer.prototype.refresh = function () {
     Tracer.prototype.refresh.call(this);
 
     var $parent = $table.parent();
-    var top = $parent.height() / 2 - $table.height() / 2;
-    var left = $parent.width() / 2 - $table.width() / 2;
-    if (top < 0) {
-        $table.css('margin-top', 0);
-        $parent.scrollTop(-top);
-    }
-    else $table.css('margin-top', top);
-    if (left < 0) {
-        $table.css('margin-left', 0);
-        $parent.scrollLeft(-left);
-    }
-    else $table.css('margin-left', left);
+    var top = $parent.height() / 2 - $table.height() / 2 + this.viewY;
+    var left = $parent.width() / 2 - $table.width() / 2 + this.viewX;
+    $table.css('margin-top', top);
+    $table.css('margin-left', left);
 };
 
 // Override
@@ -198,6 +204,44 @@ var initTable = function () {
     $('.module_container').append($table);
 };
 
+var initNavigator = function (tracer) {
+    var x, y, dragging = false;
+    var $parent = $table.parent();
+    $parent.mousedown(function (e) {
+        x = e.pageX;
+        y = e.pageY;
+        dragging = true;
+    });
+    $parent.mousemove(function (e) {
+        if (dragging) {
+            tracer.viewX += e.pageX - x;
+            tracer.viewY += e.pageY - y;
+            x = e.pageX;
+            y = e.pageY;
+            tracer.refresh();
+        }
+    });
+    $(document).mouseup(function (e) {
+        dragging = false;
+    });
+
+    $parent.bind('DOMMouseScroll mousewheel', function (e, delta) {
+        e = e.originalEvent;
+        var delta = (e.wheelDelta !== undefined && e.wheelDelta) ||
+            (e.detail !== undefined && -e.detail);
+        var weight = 1.01;
+        var ratio = delta > 0 ? 1 / weight : weight;
+        if (tracer.fontSize < 8 && ratio < 1) return false;
+        if (tracer.fontSize > 36 && ratio > 1) return false;
+        tracer.paddingV *= ratio;
+        tracer.paddingH *= ratio;
+        tracer.fontSize *= ratio;
+        $('.mtbl-cell').css(tracer.getCellCss());
+        tracer.refresh();
+        e.preventDefault();
+    });
+};
+
 var paintColor = function (sx, sy, ex, ey, colorClass, addClass) {
     for (var i = sx; i <= ex; i++) {
         var $row = $table.find('.mtbl-row').eq(i);
-- 
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