Systems, methods, and software are disclosed herein for supporting an object reshaping feature in software applications. In an implementation, an application receives an input stroke on a canvas in a user interface to the application. The input stroke originates with an instrument-down action on the canvas, terminates with an instrument-up action on the canvas, and comprises a leading component. The application monitors for interactions to occur between the leading component of the input stroke and objects on the canvas during the input stroke. When an interaction occurs between the leading component and an object on the canvas, the application reshapes the object during the input stroke to reflect the interaction.