Integrating Data/Program Structure and their Visual Expressions in the Visual Programming System

"The direct manipulation" has already become a popular keyword in the field of visual programming. In many visual programming system(VPS), the user can manipulate the program from its visual expression in the editor subsystem. But the execution process is still displayed in another window and user have to move the mouse cursor frequently. So we noticed the importance of the manipulation interface where user can do neccessary operations for programming in one field. We have implemented a prototype of such VPS using the IntelligentPad architecture. The elements of the data/program structures are expressed as pads. When user manipulate them, the program is also changed and is automatically evaluated. 1 Introduction Visual programming system(VPS) is the environment that visualizes the model of programs in two(or more)- dimentional forms with visual expressions such as pictures or animations[5][8]. VPS converts the data elements into pictorial ones, language model such as data structures o..