``` 80 x2=INT (RND*256): y2=INT (RND*128): REM random line end 90 DRAW INK c;x2-x1,y2-y1 100 x1,y1=x2,y2: REM next line starts where last one finished 110 c+=1:IF c=8 THEN c=1 120 NEXT r 130 PAUSE 0: REM Display inspection 140 NEXT m 150 STOP 1000 DEFPROC LayChange (mode) 1010 IF mode=0 THEN LAYER 0 1020 IF mode=1 THEN LAYER 1,0 1030 IF mode=2 THEN LAYER 1,1 1040 IF mode=3 THEN LAYER 1,2 1050 IF mode=4 THEN LAYER 1,3 1060 IF mode=5 THEN LAYER 2,1 1070 ENDPROC ``` In layers other than *LoRe*s and *Layer 2*, you can see how the lines seem to get broader as the program goes on, and this is because a line changes the colours of all the inked-in pixels of all the attribute positions that it passes through. You may also be temporarily perplexed about how the program doesn't crash on *LoRes* given that the selected values can exceed these of the physical resolution (*see line 80*). This would definitely be true for compatibility reasons on *Layer 0*, however on other layers, graphics output off screen is permitted for *x* and *y* values up to *65535*. Note that you can embed **PAPER**, **INK**, **FLASH** (only on layers that this is available or not turned off by enabling the *EnhancedULA* functionality), **BRIGHT** (idem), **INVERSE** and **OVER** items in a **PLOT** or **DRAW** statement just as you could with **PRINT** and **INPUT**. They go between the keyword and the coordinates, and are terminated by either semicolons or commas. An extra frill with **DRAW** is that you can use it to draw parts of circles instead of straight lines, by using an extra number to specify an angle to be turned through; the form is: **DRAW** *x_coordinate*, *y_coordinate*, *arc_turn* *x_coordinate* and *y_coordinate* are used to specify the finishing point of the line just as before and *arc_turn* is the number of radians that it must turn through as it goes; if *arc_turn* is a *positive* it turns to the *left*, while if *arc_turn* is a *negative* it turns to the *right*. Another way of seeing *arc_turn* is as showing the fraction of a complete circle that will be drawn: a complete circle is **2**π radians, so if a=π it will draw a semicircle, if a=**0.5\***π a quarter of a circle, and so on. For instance suppose **a**=π . Then whatever values *x* and *y* take, a semicircle will be drawn. Run: ``` 10 PLOT 100,100: DRAW 50,50, PI ```