MDL-42799 Assignment: Min. width/height for widget is set to 1

It was possible for user to add widgets with width/height = 0
which were not displayed to user and doesn't have much meaning to it
This patch will set min. width/height to 1

mod/assign/feedback/editpdf/classes/pdf.php

@@ -64,6 +64,10 @@ class pdf extends \FPDI {
     const GSPATH_NOTESTFILE = 'notestfile';
     /** Any other error */
     const GSPATH_ERROR = 'error';
+    /** Min. width an annotation should have */
+    const MIN_ANNOTATION_WIDTH = 5;
+    /** Min. height an annotation should have */
+    const MIN_ANNOTATION_HEIGHT = 5;
 
     /**
      * Combine the given PDF files into a single PDF. Optionally add a coversheet and coversheet fields.
@@ -300,6 +304,15 @@ class pdf extends \FPDI {
                 $ry = abs($sy - $ey) / 2;
                 $sx = min($sx, $ex) + $rx;
                 $sy = min($sy, $ey) + $ry;
+
+                // $rx and $ry should be >= min width and height
+                if ($rx < self::MIN_ANNOTATION_WIDTH) {
+                    $rx = self::MIN_ANNOTATION_WIDTH;
+                }
+                if ($ry < self::MIN_ANNOTATION_HEIGHT) {
+                    $ry = self::MIN_ANNOTATION_HEIGHT;
+                }
+
                 $this->Ellipse($sx, $sy, $rx, $ry);
                 break;
             case 'rectangle':
@@ -307,6 +320,14 @@ class pdf extends \FPDI {
                 $h = abs($sy - $ey);
                 $sx = min($sx, $ex);
                 $sy = min($sy, $ey);
+
+                // Width or height should be >= min width and height
+                if ($w < self::MIN_ANNOTATION_WIDTH) {
+                    $w = self::MIN_ANNOTATION_WIDTH;
+                }
+                if ($h < self::MIN_ANNOTATION_HEIGHT) {
+                    $h = self::MIN_ANNOTATION_HEIGHT;
+                }
                 $this->Rect($sx, $sy, $w, $h);
                 break;
             case 'highlight':
@@ -316,6 +337,12 @@ class pdf extends \FPDI {
                 $sy = min($sy, $ey) + ($h * 0.5);
                 $this->SetAlpha(0.5, 'Normal', 0.5, 'Normal');
                 $this->SetLineWidth(8.0 * $this->scale);
+
+                // width should be >= min width
+                if ($w < self::MIN_ANNOTATION_WIDTH) {
+                    $w = self::MIN_ANNOTATION_WIDTH;
+                }
+
                 $this->Rect($sx, $sy, $w, $h);
                 $this->SetAlpha(1.0, 'Normal', 1.0, 'Normal');
                 break;
@@ -326,8 +353,11 @@ class pdf extends \FPDI {
                     foreach ($points as $point) {
                         $scalepath[] = intval($point) * $this->scale;
                     }
+
+                    if (!empty($scalepath)) {
                         $this->PolyLine($scalepath, 'S');
                     }
+                }
                 break;
             case 'stamp':
                 $imgfile = $imagefolder . '/' . clean_filename($path);
@@ -335,6 +365,8 @@ class pdf extends \FPDI {
                 $h = abs($sy - $ey);
                 $sx = min($sx, $ex);
                 $sy = min($sy, $ey);
+
+                // Stamp is always more than 40px, so no need to check width/height.
                 $this->Image($imgfile, $sx, $sy, $w, $h);
                 break;
             default: // Line.

mod/assign/feedback/editpdf/yui/build/moodle-assignfeedback_editpdf-editor/moodle-assignfeedback_editpdf-editor-debug.js

@@ -250,6 +250,44 @@ RECT = function(x, y, width, height) {
         // Allow chaining.
         return this;
     };
+
+    /**
+     * Checks if rect has min width.
+     * @method has_min_width
+     * @return bool true if width is more than 5px.
+     * @public
+     */
+    this.has_min_width = function() {
+        return (this.width >= 5);
+    };
+
+    /**
+     * Checks if rect has min height.
+     * @method has_min_height
+     * @return bool true if height is more than 5px.
+     * @public
+     */
+    this.has_min_height = function() {
+        return (this.height >= 5);
+    };
+
+    /**
+     * Set min. width of annotation bound.
+     * @method set_min_width
+     * @public
+     */
+    this.set_min_width = function() {
+        this.width = 5;
+    };
+
+    /**
+     * Set min. height of annotation bound.
+     * @method set_min_height
+     * @public
+     */
+    this.set_min_height = function() {
+        this.height = 5;
+    };
 };
 
 M.assignfeedback_editpdf = M.assignfeedback_editpdf || {};
@@ -745,6 +783,7 @@ Y.extend(ANNOTATION, Y.Base, {
      * @public
      * @method init_from_edit
      * @param M.assignfeedback_editpdf.edit edit
+     * @return bool if width/height is more than min. required.
      */
     init_from_edit : function(edit) {
         var bounds = new M.assignfeedback_editpdf.rect();
@@ -758,6 +797,7 @@ Y.extend(ANNOTATION, Y.Base, {
         this.endy = bounds.y + bounds.height;
         this.colour = edit.annotationcolour;
         this.path = '';
+        return (bounds.has_min_width() && bounds.has_min_height());
     }
 
 });
@@ -860,6 +900,7 @@ Y.extend(ANNOTATIONLINE, M.assignfeedback_editpdf.annotation, {
      * @public
      * @method init_from_edit
      * @param M.assignfeedback_editpdf.edit edit
+     * @return bool true if line bound is more than min width/height, else false.
      */
     init_from_edit : function(edit) {
         this.gradeid = this.editor.get('gradeid');
@@ -870,6 +911,8 @@ Y.extend(ANNOTATIONLINE, M.assignfeedback_editpdf.annotation, {
         this.endy = edit.end.y;
         this.colour = edit.annotationcolour;
         this.path = '';
+
+        return !(((this.endx - this.x) === 0) && ((this.endy - this.y) === 0));
     }
 
 });
@@ -956,6 +999,14 @@ Y.extend(ANNOTATIONRECTANGLE, M.assignfeedback_editpdf.annotation, {
         bounds.bound([new M.assignfeedback_editpdf.point(edit.start.x, edit.start.y),
                       new M.assignfeedback_editpdf.point(edit.end.x, edit.end.y)]);
 
+        // Set min. width and height of rectangle.
+        if (!bounds.has_min_width()) {
+            bounds.set_min_width();
+        }
+        if (!bounds.has_min_height()) {
+            bounds.set_min_height();
+        }
+
         shape = this.editor.graphic.addShape({
             type: Y.Rect,
             width: bounds.width,
@@ -1056,6 +1107,14 @@ Y.extend(ANNOTATIONOVAL, M.assignfeedback_editpdf.annotation, {
         bounds.bound([new M.assignfeedback_editpdf.point(edit.start.x, edit.start.y),
                       new M.assignfeedback_editpdf.point(edit.end.x, edit.end.y)]);
 
+        // Set min. width and height of oval.
+        if (!bounds.has_min_width()) {
+            bounds.set_min_width();
+        }
+        if (!bounds.has_min_height()) {
+            bounds.set_min_height();
+        }
+
         shape = this.editor.graphic.addShape({
             type: Y.Ellipse,
             width: bounds.width,
@@ -1200,6 +1259,7 @@ Y.extend(ANNOTATIONPEN, M.assignfeedback_editpdf.annotation, {
      * @public
      * @method init_from_edit
      * @param M.assignfeedback_editpdf.edit edit
+     * @return bool true if pen bound is more than min width/height, else false.
      */
     init_from_edit : function(edit) {
         var bounds = new M.assignfeedback_editpdf.rect(),
@@ -1221,6 +1281,8 @@ Y.extend(ANNOTATIONPEN, M.assignfeedback_editpdf.annotation, {
         this.endy = bounds.y + bounds.height;
         this.colour = edit.annotationcolour;
         this.path = pathlist.join(':');
+
+        return (bounds.has_min_width() || bounds.has_min_height());
     }
 
 
@@ -1318,6 +1380,11 @@ Y.extend(ANNOTATIONHIGHLIGHT, M.assignfeedback_editpdf.annotation, {
         bounds.bound([new M.assignfeedback_editpdf.point(edit.start.x, edit.start.y),
                       new M.assignfeedback_editpdf.point(edit.end.x, edit.end.y)]);
 
+        // Set min. width of highlight.
+        if (!bounds.has_min_width()) {
+            bounds.set_min_width();
+        }
+
         highlightcolour = ANNOTATIONCOLOUR[edit.annotationcolour];
         // Add an alpha channel to the rgb colour.
 
@@ -1348,6 +1415,7 @@ Y.extend(ANNOTATIONHIGHLIGHT, M.assignfeedback_editpdf.annotation, {
      * @public
      * @method init_from_edit
      * @param M.assignfeedback_editpdf.edit edit
+     * @return bool true if highlight bound is more than min width/height, else false.
      */
     init_from_edit : function(edit) {
         var bounds = new M.assignfeedback_editpdf.rect();
@@ -1361,6 +1429,8 @@ Y.extend(ANNOTATIONHIGHLIGHT, M.assignfeedback_editpdf.annotation, {
         this.endy = edit.start.y + 16;
         this.colour = edit.annotationcolour;
         this.page = '';
+
+        return (bounds.has_min_width());
     }
 
 });
@@ -1480,6 +1550,7 @@ Y.extend(ANNOTATIONSTAMP, M.assignfeedback_editpdf.annotation, {
      * @public
      * @method init_from_edit
      * @param M.assignfeedback_editpdf.edit edit
+     * @return bool if width/height is more than min. required.
      */
     init_from_edit : function(edit) {
         var bounds = new M.assignfeedback_editpdf.rect();
@@ -1499,6 +1570,9 @@ Y.extend(ANNOTATIONSTAMP, M.assignfeedback_editpdf.annotation, {
         this.endy = bounds.y + bounds.height;
         this.colour = edit.annotationcolour;
         this.path = edit.stamp;
+
+        // Min width and height is always more than 40px.
+        return true;
     },
 
     /**
@@ -2541,6 +2615,7 @@ COMMENT = function(editor, gradeid, pageno, x, y, width, colour, rawtext) {
      * @public
      * @method init_from_edit
      * @param M.assignfeedback_editpdf.edit edit
+     * @return bool true if comment bound is more than min width/height, else false.
      */
     this.init_from_edit = function(edit) {
         var bounds = new M.assignfeedback_editpdf.rect();
@@ -2560,6 +2635,8 @@ COMMENT = function(editor, gradeid, pageno, x, y, width, colour, rawtext) {
         this.width = bounds.width;
         this.colour = edit.commentcolour;
         this.rawtext = '';
+
+        return (bounds.has_min_width() && bounds.has_min_height());
     };
 
 };
@@ -3617,10 +3694,11 @@ EDITOR.prototype = {
             }
             this.currentdrawable = false;
             comment = new M.assignfeedback_editpdf.comment(this);
-            comment.init_from_edit(this.currentedit);
+            if (comment.init_from_edit(this.currentedit)) {
                 this.pages[this.currentpage].comments.push(comment);
                 this.drawables.push(comment.draw(true));
                 this.editingcomment = true;
+            }
         } else {
             annotation = this.create_annotation(this.currentedit.tool, {});
             if (annotation) {
@@ -3628,12 +3706,12 @@ EDITOR.prototype = {
                     this.currentdrawable.erase();
                 }
                 this.currentdrawable = false;
-                annotation.init_from_edit(this.currentedit);
+                if (annotation.init_from_edit(this.currentedit)) {
                     this.pages[this.currentpage].annotations.push(annotation);
                     this.drawables.push(annotation.draw());
                 }
             }
-
+        }
 
         // Save the changes.
         this.save_current_page();

mod/assign/feedback/editpdf/yui/build/moodle-assignfeedback_editpdf-editor/moodle-assignfeedback_editpdf-editor.js

@@ -250,6 +250,44 @@ RECT = function(x, y, width, height) {
         // Allow chaining.
         return this;
     };
+
+    /**
+     * Checks if rect has min width.
+     * @method has_min_width
+     * @return bool true if width is more than 5px.
+     * @public
+     */
+    this.has_min_width = function() {
+        return (this.width >= 5);
+    };
+
+    /**
+     * Checks if rect has min height.
+     * @method has_min_height
+     * @return bool true if height is more than 5px.
+     * @public
+     */
+    this.has_min_height = function() {
+        return (this.height >= 5);
+    };
+
+    /**
+     * Set min. width of annotation bound.
+     * @method set_min_width
+     * @public
+     */
+    this.set_min_width = function() {
+        this.width = 5;
+    };
+
+    /**
+     * Set min. height of annotation bound.
+     * @method set_min_height
+     * @public
+     */
+    this.set_min_height = function() {
+        this.height = 5;
+    };
 };
 
 M.assignfeedback_editpdf = M.assignfeedback_editpdf || {};
@@ -745,6 +783,7 @@ Y.extend(ANNOTATION, Y.Base, {
      * @public
      * @method init_from_edit
      * @param M.assignfeedback_editpdf.edit edit
+     * @return bool if width/height is more than min. required.
      */
     init_from_edit : function(edit) {
         var bounds = new M.assignfeedback_editpdf.rect();
@@ -758,6 +797,7 @@ Y.extend(ANNOTATION, Y.Base, {
         this.endy = bounds.y + bounds.height;
         this.colour = edit.annotationcolour;
         this.path = '';
+        return (bounds.has_min_width() && bounds.has_min_height());
     }
 
 });
@@ -860,6 +900,7 @@ Y.extend(ANNOTATIONLINE, M.assignfeedback_editpdf.annotation, {
      * @public
      * @method init_from_edit
      * @param M.assignfeedback_editpdf.edit edit
+     * @return bool true if line bound is more than min width/height, else false.
      */
     init_from_edit : function(edit) {
         this.gradeid = this.editor.get('gradeid');
@@ -870,6 +911,8 @@ Y.extend(ANNOTATIONLINE, M.assignfeedback_editpdf.annotation, {
         this.endy = edit.end.y;
         this.colour = edit.annotationcolour;
         this.path = '';
+
+        return !(((this.endx - this.x) === 0) && ((this.endy - this.y) === 0));
     }
 
 });
@@ -956,6 +999,14 @@ Y.extend(ANNOTATIONRECTANGLE, M.assignfeedback_editpdf.annotation, {
         bounds.bound([new M.assignfeedback_editpdf.point(edit.start.x, edit.start.y),
                       new M.assignfeedback_editpdf.point(edit.end.x, edit.end.y)]);
 
+        // Set min. width and height of rectangle.
+        if (!bounds.has_min_width()) {
+            bounds.set_min_width();
+        }
+        if (!bounds.has_min_height()) {
+            bounds.set_min_height();
+        }
+
         shape = this.editor.graphic.addShape({
             type: Y.Rect,
             width: bounds.width,
@@ -1056,6 +1107,14 @@ Y.extend(ANNOTATIONOVAL, M.assignfeedback_editpdf.annotation, {
         bounds.bound([new M.assignfeedback_editpdf.point(edit.start.x, edit.start.y),
                       new M.assignfeedback_editpdf.point(edit.end.x, edit.end.y)]);
 
+        // Set min. width and height of oval.
+        if (!bounds.has_min_width()) {
+            bounds.set_min_width();
+        }
+        if (!bounds.has_min_height()) {
+            bounds.set_min_height();
+        }
+
         shape = this.editor.graphic.addShape({
             type: Y.Ellipse,
             width: bounds.width,
@@ -1200,6 +1259,7 @@ Y.extend(ANNOTATIONPEN, M.assignfeedback_editpdf.annotation, {
      * @public
      * @method init_from_edit
      * @param M.assignfeedback_editpdf.edit edit
+     * @return bool true if pen bound is more than min width/height, else false.
      */
     init_from_edit : function(edit) {
         var bounds = new M.assignfeedback_editpdf.rect(),
@@ -1221,6 +1281,8 @@ Y.extend(ANNOTATIONPEN, M.assignfeedback_editpdf.annotation, {
         this.endy = bounds.y + bounds.height;
         this.colour = edit.annotationcolour;
         this.path = pathlist.join(':');
+
+        return (bounds.has_min_width() || bounds.has_min_height());
     }
 
 
@@ -1318,6 +1380,11 @@ Y.extend(ANNOTATIONHIGHLIGHT, M.assignfeedback_editpdf.annotation, {
         bounds.bound([new M.assignfeedback_editpdf.point(edit.start.x, edit.start.y),
                       new M.assignfeedback_editpdf.point(edit.end.x, edit.end.y)]);
 
+        // Set min. width of highlight.
+        if (!bounds.has_min_width()) {
+            bounds.set_min_width();
+        }
+
         highlightcolour = ANNOTATIONCOLOUR[edit.annotationcolour];
         // Add an alpha channel to the rgb colour.
 
@@ -1348,6 +1415,7 @@ Y.extend(ANNOTATIONHIGHLIGHT, M.assignfeedback_editpdf.annotation, {
      * @public
      * @method init_from_edit
      * @param M.assignfeedback_editpdf.edit edit
+     * @return bool true if highlight bound is more than min width/height, else false.
      */
     init_from_edit : function(edit) {
         var bounds = new M.assignfeedback_editpdf.rect();
@@ -1361,6 +1429,8 @@ Y.extend(ANNOTATIONHIGHLIGHT, M.assignfeedback_editpdf.annotation, {
         this.endy = edit.start.y + 16;
         this.colour = edit.annotationcolour;
         this.page = '';
+
+        return (bounds.has_min_width());
     }
 
 });
@@ -1480,6 +1550,7 @@ Y.extend(ANNOTATIONSTAMP, M.assignfeedback_editpdf.annotation, {
      * @public
      * @method init_from_edit
      * @param M.assignfeedback_editpdf.edit edit
+     * @return bool if width/height is more than min. required.
      */
     init_from_edit : function(edit) {
         var bounds = new M.assignfeedback_editpdf.rect();
@@ -1499,6 +1570,9 @@ Y.extend(ANNOTATIONSTAMP, M.assignfeedback_editpdf.annotation, {
         this.endy = bounds.y + bounds.height;
         this.colour = edit.annotationcolour;
         this.path = edit.stamp;
+
+        // Min width and height is always more than 40px.
+        return true;
     },
 
     /**
@@ -2541,6 +2615,7 @@ COMMENT = function(editor, gradeid, pageno, x, y, width, colour, rawtext) {
      * @public
      * @method init_from_edit
      * @param M.assignfeedback_editpdf.edit edit
+     * @return bool true if comment bound is more than min width/height, else false.
      */
     this.init_from_edit = function(edit) {
         var bounds = new M.assignfeedback_editpdf.rect();
@@ -2560,6 +2635,8 @@ COMMENT = function(editor, gradeid, pageno, x, y, width, colour, rawtext) {
         this.width = bounds.width;
         this.colour = edit.commentcolour;
         this.rawtext = '';
+
+        return (bounds.has_min_width() && bounds.has_min_height());
     };
 
 };
@@ -3617,10 +3694,11 @@ EDITOR.prototype = {
             }
             this.currentdrawable = false;
             comment = new M.assignfeedback_editpdf.comment(this);
-            comment.init_from_edit(this.currentedit);
+            if (comment.init_from_edit(this.currentedit)) {
                 this.pages[this.currentpage].comments.push(comment);
                 this.drawables.push(comment.draw(true));
                 this.editingcomment = true;
+            }
         } else {
             annotation = this.create_annotation(this.currentedit.tool, {});
             if (annotation) {
@@ -3628,12 +3706,12 @@ EDITOR.prototype = {
                     this.currentdrawable.erase();
                 }
                 this.currentdrawable = false;
-                annotation.init_from_edit(this.currentedit);
+                if (annotation.init_from_edit(this.currentedit)) {
                     this.pages[this.currentpage].annotations.push(annotation);
                     this.drawables.push(annotation.draw());
                 }
             }
-
+        }
 
         // Save the changes.
         this.save_current_page();

mod/assign/feedback/editpdf/yui/src/editor/js/annotation.js

@@ -308,6 +308,7 @@ Y.extend(ANNOTATION, Y.Base, {
      * @public
      * @method init_from_edit
      * @param M.assignfeedback_editpdf.edit edit
+     * @return bool if width/height is more than min. required.
      */
     init_from_edit : function(edit) {
         var bounds = new M.assignfeedback_editpdf.rect();
@@ -321,6 +322,7 @@ Y.extend(ANNOTATION, Y.Base, {
         this.endy = bounds.y + bounds.height;
         this.colour = edit.annotationcolour;
         this.path = '';
+        return (bounds.has_min_width() && bounds.has_min_height());
     }
 
 });

mod/assign/feedback/editpdf/yui/src/editor/js/annotationhighlight.js

@@ -88,6 +88,11 @@ Y.extend(ANNOTATIONHIGHLIGHT, M.assignfeedback_editpdf.annotation, {
         bounds.bound([new M.assignfeedback_editpdf.point(edit.start.x, edit.start.y),
                       new M.assignfeedback_editpdf.point(edit.end.x, edit.end.y)]);
 
+        // Set min. width of highlight.
+        if (!bounds.has_min_width()) {
+            bounds.set_min_width();
+        }
+
         highlightcolour = ANNOTATIONCOLOUR[edit.annotationcolour];
         // Add an alpha channel to the rgb colour.
 
@@ -118,6 +123,7 @@ Y.extend(ANNOTATIONHIGHLIGHT, M.assignfeedback_editpdf.annotation, {
      * @public
      * @method init_from_edit
      * @param M.assignfeedback_editpdf.edit edit
+     * @return bool true if highlight bound is more than min width/height, else false.
      */
     init_from_edit : function(edit) {
         var bounds = new M.assignfeedback_editpdf.rect();
@@ -131,6 +137,8 @@ Y.extend(ANNOTATIONHIGHLIGHT, M.assignfeedback_editpdf.annotation, {
         this.endy = edit.start.y + 16;
         this.colour = edit.annotationcolour;
         this.page = '';
+
+        return (bounds.has_min_width());
     }
 
 });

mod/assign/feedback/editpdf/yui/src/editor/js/annotationline.js

@@ -94,6 +94,7 @@ Y.extend(ANNOTATIONLINE, M.assignfeedback_editpdf.annotation, {
      * @public
      * @method init_from_edit
      * @param M.assignfeedback_editpdf.edit edit
+     * @return bool true if line bound is more than min width/height, else false.
      */
     init_from_edit : function(edit) {
         this.gradeid = this.editor.get('gradeid');
@@ -104,6 +105,8 @@ Y.extend(ANNOTATIONLINE, M.assignfeedback_editpdf.annotation, {
         this.endy = edit.end.y;
         this.colour = edit.annotationcolour;
         this.path = '';
+
+        return !(((this.endx - this.x) === 0) && ((this.endy - this.y) === 0));
     }
 
 });

mod/assign/feedback/editpdf/yui/src/editor/js/annotationoval.js

@@ -78,6 +78,14 @@ Y.extend(ANNOTATIONOVAL, M.assignfeedback_editpdf.annotation, {
         bounds.bound([new M.assignfeedback_editpdf.point(edit.start.x, edit.start.y),
                       new M.assignfeedback_editpdf.point(edit.end.x, edit.end.y)]);
 
+        // Set min. width and height of oval.
+        if (!bounds.has_min_width()) {
+            bounds.set_min_width();
+        }
+        if (!bounds.has_min_height()) {
+            bounds.set_min_height();
+        }
+
         shape = this.editor.graphic.addShape({
             type: Y.Ellipse,
             width: bounds.width,

mod/assign/feedback/editpdf/yui/src/editor/js/annotationpen.js

@@ -122,6 +122,7 @@ Y.extend(ANNOTATIONPEN, M.assignfeedback_editpdf.annotation, {
      * @public
      * @method init_from_edit
      * @param M.assignfeedback_editpdf.edit edit
+     * @return bool true if pen bound is more than min width/height, else false.
      */
     init_from_edit : function(edit) {
         var bounds = new M.assignfeedback_editpdf.rect(),
@@ -143,6 +144,8 @@ Y.extend(ANNOTATIONPEN, M.assignfeedback_editpdf.annotation, {
         this.endy = bounds.y + bounds.height;
         this.colour = edit.annotationcolour;
         this.path = pathlist.join(':');
+
+        return (bounds.has_min_width() || bounds.has_min_height());
     }
 
 

mod/assign/feedback/editpdf/yui/src/editor/js/annotationrectangle.js

@@ -78,6 +78,14 @@ Y.extend(ANNOTATIONRECTANGLE, M.assignfeedback_editpdf.annotation, {
         bounds.bound([new M.assignfeedback_editpdf.point(edit.start.x, edit.start.y),
                       new M.assignfeedback_editpdf.point(edit.end.x, edit.end.y)]);
 
+        // Set min. width and height of rectangle.
+        if (!bounds.has_min_width()) {
+            bounds.set_min_width();
+        }
+        if (!bounds.has_min_height()) {
+            bounds.set_min_height();
+        }
+
         shape = this.editor.graphic.addShape({
             type: Y.Rect,
             width: bounds.width,

mod/assign/feedback/editpdf/yui/src/editor/js/annotationstamp.js

@@ -111,6 +111,7 @@ Y.extend(ANNOTATIONSTAMP, M.assignfeedback_editpdf.annotation, {
      * @public
      * @method init_from_edit
      * @param M.assignfeedback_editpdf.edit edit
+     * @return bool if width/height is more than min. required.
      */
     init_from_edit : function(edit) {
         var bounds = new M.assignfeedback_editpdf.rect();
@@ -130,6 +131,9 @@ Y.extend(ANNOTATIONSTAMP, M.assignfeedback_editpdf.annotation, {
         this.endy = bounds.y + bounds.height;
         this.colour = edit.annotationcolour;
         this.path = edit.stamp;
+
+        // Min width and height is always more than 40px.
+        return true;
     },
 
     /**

mod/assign/feedback/editpdf/yui/src/editor/js/comment.js

@@ -411,6 +411,7 @@ COMMENT = function(editor, gradeid, pageno, x, y, width, colour, rawtext) {
      * @public
      * @method init_from_edit
      * @param M.assignfeedback_editpdf.edit edit
+     * @return bool true if comment bound is more than min width/height, else false.
      */
     this.init_from_edit = function(edit) {
         var bounds = new M.assignfeedback_editpdf.rect();
@@ -430,6 +431,8 @@ COMMENT = function(editor, gradeid, pageno, x, y, width, colour, rawtext) {
         this.width = bounds.width;
         this.colour = edit.commentcolour;
         this.rawtext = '';
+
+        return (bounds.has_min_width() && bounds.has_min_height());
     };
 
 };

mod/assign/feedback/editpdf/yui/src/editor/js/editor.js

@@ -785,10 +785,11 @@ EDITOR.prototype = {
             }
             this.currentdrawable = false;
             comment = new M.assignfeedback_editpdf.comment(this);
-            comment.init_from_edit(this.currentedit);
+            if (comment.init_from_edit(this.currentedit)) {
                 this.pages[this.currentpage].comments.push(comment);
                 this.drawables.push(comment.draw(true));
                 this.editingcomment = true;
+            }
         } else {
             annotation = this.create_annotation(this.currentedit.tool, {});
             if (annotation) {
@@ -796,12 +797,12 @@ EDITOR.prototype = {
                     this.currentdrawable.erase();
                 }
                 this.currentdrawable = false;
-                annotation.init_from_edit(this.currentedit);
+                if (annotation.init_from_edit(this.currentedit)) {
                     this.pages[this.currentpage].annotations.push(annotation);
                     this.drawables.push(annotation.draw());
                 }
             }
-
+        }
 
         // Save the changes.
         this.save_current_page();

mod/assign/feedback/editpdf/yui/src/editor/js/rect.js

@@ -99,6 +99,44 @@ RECT = function(x, y, width, height) {
         // Allow chaining.
         return this;
     };
+
+    /**
+     * Checks if rect has min width.
+     * @method has_min_width
+     * @return bool true if width is more than 5px.
+     * @public
+     */
+    this.has_min_width = function() {
+        return (this.width >= 5);
+    };
+
+    /**
+     * Checks if rect has min height.
+     * @method has_min_height
+     * @return bool true if height is more than 5px.
+     * @public
+     */
+    this.has_min_height = function() {
+        return (this.height >= 5);
+    };
+
+    /**
+     * Set min. width of annotation bound.
+     * @method set_min_width
+     * @public
+     */
+    this.set_min_width = function() {
+        this.width = 5;
+    };
+
+    /**
+     * Set min. height of annotation bound.
+     * @method set_min_height
+     * @public
+     */
+    this.set_min_height = function() {
+        this.height = 5;
+    };
 };
 
 M.assignfeedback_editpdf = M.assignfeedback_editpdf || {};