williams-et-al-1983-apple-ii-computer-graphics

50 APPLE II COMPUTER GRAPHICSType the decimal number fo r the color you want (see Figure 6-2} and thenpress retu rn. You will then see a flashing cursor in the center of the screen.The cursor may be moved anywhere on the screen by using the keysshown below.uI()\ I\ /\ /\!/J----* .. ··· -·- ·+:/!\/ \I \/ \Figure 6-5. Cursor movement.The I, M, J, and K keys move the cursor up, down, left, and right; the U,0, N, and , keys move the cursor diagonally as indicated . Try it!!The editor also uses the P, C, and Q keys. To plot a point, press P andthen move the cursor out of the way. Press C and you will be given theopportun ity to set the color as you did at the beginning of the program.Press Q, and you will be askedQUIT? (Y/N)Press Y if you wish to quit and N if you do not.Any color block may be erased by simply covering the offending blockwith the cursor. That makes erasing very simple-sometimes too sim ple,but you will get used to it.Use the editor to copy the apple from Figure6-4.Saving FiguresNow that you have a picture on the screen, you probably would like to beable to save it. Assuming that you have a disk drive, type