Extension for the SD Method

[kurokida]

This is the pull request for the discussion #3632

Extention of the survey-likert plugin to enable the use of the SD method.

I have added the following properties to the survey-likert plugin.

• stimulus: The path of the image file to be displayed.
• image_caption: The string displayed below the image.
• image_width: The width of the image.
• scale_area_height: The height of the area where the scale is displayed.
• left_anchor_width: The width of the left anchor.
• right_anchor_width: The width of the right anchor.
• line_position: A numeric value for adjusting the position of the anchors and the horizontal alignment.
• left_anchor: The string displayed at the left end in the SD method. This is specified for each question.
• right_anchor: The string displayed at the right end in the SD method. This is specified for each question.

I have also attached an image showing how it looks when used with the SD method.

Thank you for your consideration.

Best regards,
Daiichiro

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[jadeddelta]

hey @kurokida, thank you for the contribution! as it stands it does look like this heavily modifies the likert in a way that isn't backwards-compatible and overall adds a lot that would warrant it to be its own plugin. if you'd like, you can submit this as a new plugin plugin-likert-sd in jspsych-contrib and we can take a look at it!