Drawing assistance device and drawing assistance method

A drawing assistance method executed by a controller configured to assist an operator with a drawing operation of converting image data of a design diagram into digital data, the drawing assistance method comprising:

• acquiring the image data of the design diagram to detect dimensional information drawn on the image data;
• detecting an arrow drawn on the image data;
• detecting a line drawn on the image data;
• combining the arrow and the line based on a position of the arrow and a position of the line to generate a dimension line;
• detecting a dimension value corresponding to a position of the dimension line from the dimensional information so as to assign the detected dimension value to the dimension line;
• generating guidelines indicating positions of ends of the dimension line;
• superposing the guidelines on the image data to display the guidelines on an editing screen;
• and
• outputting the digital data of the design diagram drawn by the operator on the editing screen on which the guidelines are displayed.