``` 540 DATA 227, 227, 227, 227, 227, 227, 227, 224, 224, 227, 227, 227, 227, 227, 227, 227 ``` Now, unlike the previous encouragement, **RUN** the program again. This will reserve a new bank for sprites which isn't normally recommended but it is okay for the purposes of our example. What we have done now is to create two patterns that are similar but differ slightly in the cannons section and the engine section. Lines 136 to 150 will display sprite **0**, 50 succesive times, however where things differ is at line 137 which "flips a switch" from pattern **0** to pattern **1** for sprite **0** displayed at line 140. If you cannot see the effect very well, you can insert a: ``` PAUSE 3 ``` at the end of line 140 which should give you just about enough delay to see the sprite changing at the engine and cannon sections while at the same time demonstrating how important time control is in animation. We did cover the bitmap animation of the sprite itself; let's now see how we can make it move. First however let's try to rotate the sprite in place so we can also see the usage of the flags in action. Add the following lines: ``` 107 %p=0 108 REPEAT 109 IF %p=0 THEN %f=%@0001 110 IF %p=1 THEN %f=%@0011 111 IF %p=2 THEN %f=%@0101 112 IF %p=3 THEN %f=%@1011 141 REPEAT UNTIL %p>3 ``` and make line 140: ``` 140 SPRITE 0,152,119,%s,%f:PAUSE 3: %p+=1 ``` Now execute again with **GO TO 100** and you will see the sprite rotate in place. > **Notes** > > SPRITES cannot be saved as parts of any screenshot facility with the *NMI menu* or via SAVE … LAYER because they exists outside of normal memory space. The process is quite simple; the last bit being the visibility flag: First the sprite is printed upright, then the *rotation flag bit* gets turned on to give it a right angle turn, then it gets turned off and the *Y mirror flag bit* gets turned on to make the sprite point downwards and finally the *rotation flag bit* together with the *X mirror flag bit* get turn on to rotate the sprite clockwise 90° and then mirrored horizontally to make the sprite pointing to the left. The process restarts from the sprite pointing upwards when the rotation variable **%p** gets reset to **0** and the whole thing repeats **50** times, all the while changing between patterns **0** and **1**. ### Moving Sprites on Screen Time to move the sprite about the screen; we'll start easy and then introduce you to the real reason (that is obviously humourus) why maths exist! First remove all lines between 106 and 150 and replace with these: ``` 106 FOR %a = 0 TO 255 ```