Commodore 128D - Page 110

u
Drawing a Box— Now try a box. To draw a box, type:
80 BOX1,20,100,80,160,90,1 y
This draws a solid box to the left of the circle. To find out what the
numbers in the box statement mean, consult Chapter V, BASIC 7.0 [ j
Encyclopedia. The BOX statement has seven parameters you can
select and modify to produce different types of boxes. Change the
foreground color and draw the outline of a box to the right of the CIR
CLE with these statements:
90 COLOR1,9:REM CHANGE FOREGROUND COLOR
100 BOX1,220,100,280,160,90,0
Experiment with the BOX statement to produce different variations
of rectangles and boxes.
Drawing Lines, You now know how to select graphic modes and
Points and colors and how to display circles and boxes on
Other Shapes— the screen. Another graphics statement, DRAW,
The lets you draw lines on the screen just as you
DRAW Command would with a pencil and a piece of paper. The
following statement draws a line below the
boxes and circle.
120 DRAW 1,20,180 TO 280,180
Here's what the numbers mean:
• 1 is the color source (in this case the foreground)
• 20 is the starting X (horizontal) coordinate
• 180 is the starting Y (verticle) coordinate
• 280 is the ending horizontal coordinate
• 180 is the ending verticle screen coordinate.
To erase a drawn line, change the source (1) in the DRAW statement
to 0. The line is drawn with the background color which erases the
line. Try using different coordinates and other sources to become
accustomed to the DRAW statement.
The DRAW statement can take another form that allows you to
DRAW a line, change direction and then DRAW another line, so the
lines are continuous. For example, try this statement:
130 DRAW 1,10,20 TO 300,20 TO 150,80 TO 10,20
This statement DRAWs a triangle on the top of the scren. The four
pairs of numbers represent the X and Y coordinates for the three
points of the triangles. Notice the first and last coordinates are the
102 USING C128 MODE—Color, Animation and Sprite Graphics Statements