lib: implement setTextScale functionality.

 - fixes #172

Author: narekhovhannisyan

lib/project-data.js

@@ -10,6 +10,7 @@ const {
   CharacterBasedDurationError,
   DurationGreaterThanMaxPossibleError,
   IconAdjustableError,
+  InvalidTextScaleValue,
   LowerThirdAdjustableError,
   NotImageAreaError,
   NotTextAreaError,
@@ -427,8 +428,9 @@ class ProjectData {
   constructArea (area) {
     const {
       id, fileName, height, width, value, cords, title, wordCount, originalHeight, originalWidth, order, type,
-      mimeType, webpPath, fileType, thumbnailPath, imageCropParams, videoCropParams
+      mimeType, webpPath, fileType, thumbnailPath, imageCropParams, videoCropParams, font
     } = area
+    const self = this
 
     const result = {
       id,
@@ -440,6 +442,7 @@ class ProjectData {
       wordCount,
       order,
       type,
+      font,
       /**
        * Returns area type.
        * @return {String}
@@ -449,11 +452,26 @@ class ProjectData {
        * Checks if area type is `text`, then sets the given value.
        * @param {String} text - The text value to set.
        * @throws {NotTextAreaError}
+       * @return {result}
        */
-      setText: (text) => {
+      setText: function (text) {
         checkAreaType(area, 'text')(NotTextAreaError.of(`Area with id: ${id} is not text.`))
         area.value = text
-        this.patchProperties.push('screens')
+        self.patchProperties.push('screens')
+        return this
+      },
+      /**
+       *
+       * @param scale
+       * @return {result}
+       */
+      setTextScale: function (scale) {
+        checkAreaType(area, 'text')(NotTextAreaError.of(`Area with id: ${id} is not text.`))
+        if (scale < 80 || scale > 120) {
+          throw new InvalidTextScaleValue('The text scale value must be between 80 and 120.')
+        }
+        font.scale = scale
+        return this
       },
       /**
        * Checks if area is `text`, then returns recommended character count.