diff --git a/build/ANN_d3viz.d.ts b/build/ANN_d3viz.d.ts
index e239c85..811d8fe 100644
--- a/build/ANN_d3viz.d.ts
+++ b/build/ANN_d3viz.d.ts
@@ -2,7 +2,10 @@
 /// <reference path="../viz/ts/build/svg.d.ts" />
 declare namespace viz {
     abstract class chart {
-        size: Canvas.Size;
+        displayId: string;
+        size: Canvas.Size | [number, number];
+        margin: Canvas.Margin;
+        constructor(displayId: string, size?: Canvas.Size | [number, number], margin?: Canvas.Margin);
     }
 }
 declare namespace viz {
diff --git a/build/ANN_d3viz.js b/build/ANN_d3viz.js
index 445573f..220b9ec 100644
--- a/build/ANN_d3viz.js
+++ b/build/ANN_d3viz.js
@@ -13,7 +13,18 @@ var __extends = (this && this.__extends) || (function () {
 var viz;
 (function (viz) {
     var chart = /** @class */ (function () {
-        function chart() {
+        function chart(displayId, size, margin) {
+            if (size === void 0) { size = [900, 600]; }
+            if (margin === void 0) { margin = new Canvas.Margin(20, 20, 30, 30); }
+            this.displayId = displayId;
+            this.size = size;
+            this.margin = margin;
+            if (Array.isArray(size)) {
+                this.size = new Canvas.Size(size[0], size[1]);
+            }
+            else {
+                this.size = size;
+            }
         }
         return chart;
     }());
diff --git a/build/ANN_d3viz.js.map b/build/ANN_d3viz.js.map
index 9498fa9..0bdd327 100644
--- a/build/ANN_d3viz.js.map
+++ b/build/ANN_d3viz.js.map
@@ -1 +1 @@
-{"version":3,"file":"ANN_d3viz.js","sourceRoot":"","sources":["../viz/ANN_viz/app.ts","../viz/ANN_viz/types/D3Chart.ts","../viz/ANN_viz/types/AreaChart.ts","../viz/ANN_viz/types/LineChart.ts"],"names":[],"mappings":";;;;;;;;;;AAAA,8CAA8C;AAC9C,6CAA6C;ACD7C,IAAU,GAAG,CAMZ;AAND,WAAU,GAAG;IAET;QAAA;QAGA,CAAC;QAAD,YAAC;IAAD,CAAC,AAHD,IAGC;IAHqB,SAAK,QAG1B,CAAA;AACL,CAAC,EANS,GAAG,KAAH,GAAG,QAMZ;ACND,qCAAqC;AAErC,IAAU,GAAG,CAKZ;AALD,WAAU,GAAG;IAET;QAA+B,6BAAK;QAApC;;QAEA,CAAC;QAAD,gBAAC;IAAD,CAAC,AAFD,CAA+B,IAAA,KAAK,GAEnC;IAFY,aAAS,YAErB,CAAA;AACL,CAAC,EALS,GAAG,KAAH,GAAG,QAKZ;ACPD,IAAU,GAAG,CAMZ;AAND,WAAU,GAAG;IAET;QAAA;QAGA,CAAC;QAAD,gBAAC;IAAD,CAAC,AAHD,IAGC;IAHY,aAAS,YAGrB,CAAA;AACL,CAAC,EANS,GAAG,KAAH,GAAG,QAMZ"}
\ No newline at end of file
+{"version":3,"file":"ANN_d3viz.js","sourceRoot":"","sources":["../viz/ANN_viz/app.ts","../viz/ANN_viz/types/D3Chart.ts","../viz/ANN_viz/types/AreaChart.ts","../viz/ANN_viz/types/LineChart.ts"],"names":[],"mappings":";;;;;;;;;;AAAA,8CAA8C;AAC9C,6CAA6C;ACD7C,IAAU,GAAG,CAiBZ;AAjBD,WAAU,GAAG;IAET;QAEI,eACW,SAAiB,EACjB,IAAiD,EACjD,MAAyD;YADzD,qBAAA,EAAA,QAAwC,GAAG,EAAE,GAAG,CAAC;YACjD,uBAAA,EAAA,aAA4B,MAAM,CAAC,MAAM,CAAC,EAAE,EAAE,EAAE,EAAE,EAAE,EAAE,EAAE,CAAC;YAFzD,cAAS,GAAT,SAAS,CAAQ;YACjB,SAAI,GAAJ,IAAI,CAA6C;YACjD,WAAM,GAAN,MAAM,CAAmD;YAEhE,IAAI,KAAK,CAAC,OAAO,CAAC,IAAI,CAAC,EAAE;gBACrB,IAAI,CAAC,IAAI,GAAG,IAAI,MAAM,CAAC,IAAI,CAAC,IAAI,CAAC,CAAC,CAAC,EAAE,IAAI,CAAC,CAAC,CAAC,CAAC,CAAC;aACjD;iBAAM;gBACH,IAAI,CAAC,IAAI,GAAG,IAAI,CAAC;aACpB;QACL,CAAC;QAEL,YAAC;IAAD,CAAC,AAdD,IAcC;IAdqB,SAAK,QAc1B,CAAA;AACL,CAAC,EAjBS,GAAG,KAAH,GAAG,QAiBZ;ACjBD,qCAAqC;AAErC,IAAU,GAAG,CAKZ;AALD,WAAU,GAAG;IAET;QAA+B,6BAAK;QAApC;;QAEA,CAAC;QAAD,gBAAC;IAAD,CAAC,AAFD,CAA+B,IAAA,KAAK,GAEnC;IAFY,aAAS,YAErB,CAAA;AACL,CAAC,EALS,GAAG,KAAH,GAAG,QAKZ;ACPD,IAAU,GAAG,CAMZ;AAND,WAAU,GAAG;IAET;QAAA;QAGA,CAAC;QAAD,gBAAC;IAAD,CAAC,AAHD,IAGC;IAHY,aAAS,YAGrB,CAAA;AACL,CAAC,EANS,GAAG,KAAH,GAAG,QAMZ"}
\ No newline at end of file