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James Gregory 2013-12-30 18:34:31 +11:00
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35-04.md
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@ -81,7 +81,7 @@
Y_MAX / 4, 4);
/* Wait for the enter key to be pressed */
scanf(“%c”, &temp);
scanf("%c", &temp);
/* Return back to text mode */
_AX = TEXT_MODE;
@ -91,8 +91,8 @@
#### Looking at EVGALine {#Heading7}
The **EVGALine** function itself performs four operations. **EVGALine**
first sets up the VGA’s hardware so that all pixels drawn will be in the
desired color. This is accomplished by setting two of the VGA’s
first sets up the VGA's hardware so that all pixels drawn will be in the
desired color. This is accomplished by setting two of the VGA's
registers, the Enable Set/Reset register and the Set/Reset register.
Setting the Enable Set/Reset to the value 0FH, as is done in
**EVGALine**, causes all drawing to produce pixels in the color
@ -105,7 +105,7 @@ Set/Reset and Set/Reset registers in this way causes the remainder of
**EVGALine** next performs a simple check to cut in half the number of
line orientations that must be handled separately. Figure 35.4 shows the
eight possible line orientations among which a Bresenham’s algorithm
eight possible line orientations among which a Bresenham's algorithm
implementation must distinguish. (In interpreting Figure 35.4, assume
that lines radiate outward from the center of the figure, falling into
one of eight octants delineated by the horizontal and vertical axes and
@ -144,7 +144,7 @@ coordinate changes on every pixel and the X coordinate changes only when
the running error dictates, since Y is the major axis.
![](images/35-04.jpg)\
**Figure 35.4**  *Bresenham’s eight possible line orientations.*
**Figure 35.4**  *Bresenham's eight possible line orientations.*
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