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→Program: The DDA algorithm requires rounding the floating point x,y to the nearest integer. The sample code should not depend on the behavior of some specific graphics library's putpixel() (for example if it takes int parameters, float->int uses truncation and will produce the wrong answer) |
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▲ khayam{{short description|Hardware or software used for interpolation of variables over an interval}}
{{About|a graphics algorithm|the digital implementation of a differential analyzer|Digital differential analyzer}}
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== Program ==
DDA algorithm
<syntaxhighlight lang="
#include <graphics.h>
#include <iostream.h>
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#include <conio.h>
void main(
{
float x,
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dx = (x2 - x1);
dy = (y2 - y1);
if (abs(dx) >= abs(dy))
step = abs(dx);
else
step = abs(dy);
dx = dx / step;
dy = dy / step;
x = x1;
y = y1;
i =
while (i <= step) {
putpixel(round(x), round(y), 5);
x = x + dx;
y = y + dy;
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delay(100);
}
getch();
closegraph();
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[[Category:Computer graphics algorithms]]
[[Category:Digital geometry]]
[[Category:Articles with example C++ code]]
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