I bet you could start with and rework the cannon template that comes default with GameSalad. The cannon points toward the mouse. Then all you have to do is instead of the cannon, you have an arrow image. You can even make the image stretch so that the bottom of the arrow sticks to the pivot point and the end stays with the mouse. Just have it so that when the mouse x y is measured from the pivot x y, the resulting number is stored as a global (game) attribute. Then constrain the width or length (depending on image orientation) of the arrow to that game attribute. I think that is how you'd do it.
Just look for templates that show you how to measure the distance between the mouse and another object and templates that show you how to stretch an object with the mouse. You should be able to figure it out quickly after that.
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Just look for templates that show you how to measure the distance between the mouse and another object and templates that show you how to stretch an object with the mouse. You should be able to figure it out quickly after that.