DEVICE FOR FORMING DISPLAY PICTURE

PURPOSE:To execute program debugging effectively by forming and storing a source program on the basis of input information obtained from a graphic input device, reading out the program on the basis of a prescribed input, processing the read-out result by a picture simulation mechanism and displaying the processed result on a graphic display device of the graphic input device. CONSTITUTION:The graphic input device 1 is provided with a graphic display device and a graphic formation device 20 is provided with a graphic formation function and a picture simulating function. A source program obtained by combining graphic data formed by the device with its logic is stored in a graphic source memory 30 and the contents of the memory 30 are outputted to an on-line graphic memory 60 through a graphic compile link device 5. Then, a graph formed on the basis of a program stored in the memory 60 is allowed to be displayed on an on-line graphic display device 8, data for simulating a variable inputted through an on-line is inputted from the device 1, the program in the memory 30 is graphically inputted by using the simulating function of the device 20 and displayed on the graphic display device in the device 1.