Add hotfix to scale font size based on transformation matrix

Author: Flamenco

HOTFIX_README.md

@@ -25,5 +25,18 @@ Filling paths
 In certain cases, closing a fill would result in a path resolving to an incorrect point.
 The was most likely fixed when we refactored matrix logic.  Enabling this hotfix will ignore a most-likely unneeded workaround.
 
+
+##scale_text
+
+###Applies To
+context2d plugin
+
+### Affects
+Drawing and Filling Text when a scale transformation is active.
+
+### Description
+jsPDF currently has no way to draw scaled text.  
+This hotfix scales the current font size by the x-axis scale factor.
+ 
 #Accepted Hotfixes
 There a currently no accepted hotfixes.

plugins/context2d.js

@@ -299,7 +299,22 @@
                 this.path = origPath;
             }
 
-            this.pdf.text(text, x, this._getBaseline(y), null, degs);
+            var scale;
+            if (this.pdf.hotfix && this.pdf.hotfix.scale_text) {
+                scale = this._getTransform()[0];
+            }
+            else {
+                scale = 1;
+            }
+            if (scale === 1) {
+                this.pdf.text(text, x, this._getBaseline(y), null, degs);
+            }
+            else {
+                var oldSize = this.pdf.internal.getFontSize();
+                this.pdf.setFontSize(oldSize * scale);
+                this.pdf.text(text, x, this._getBaseline(y), null, degs);
+                this.pdf.setFontSize(oldSize);
+            }
 
             if (this.ctx._clip_path.length > 0) {
                 lines.push('Q');
@@ -337,9 +352,26 @@
                 this.path = origPath;
             }
 
-            this.pdf.text(text, x, this._getBaseline(y), {
+            var scale;
+            if (this.pdf.hotfix && this.pdf.hotfix.scale_text) {
+                scale = this._getTransform()[0];
+            }
+            else {
+                scale = 1;
+            }
+            if (scale === 1) {
+                this.pdf.text(text, x, this._getBaseline(y), {
                 stroke: true
             }, degs);
+            }
+            else {
+                var oldSize = this.pdf.internal.getFontSize();
+                this.pdf.setFontSize(oldSize * scale);
+                this.pdf.text(text, x, this._getBaseline(y), {
+                    stroke: true
+                }, degs);
+                this.pdf.setFontSize(oldSize);
+            }
 
             if (this.ctx._clip_path.length > 0) {
                 lines.push('Q');