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Displaying  Source Code(s)

 Line Drawing Algorithm - Bresenham -------------------------------------------------------------------------------- Description : All of you might have used the Line function in C and might have wondered about its working and algorithm used. This program demonstrates the use of Bresenham's Line Drawing algorithm. I hope you will like it. #include #include #include void main() { int gd = DETECT, gm; int dx, dy, p, end; float x1, x2, y1, y2, x, y; initgraph(&gd, &gm, "c:\tc\bgi"); printf("Enter Value of X1: "); scanf("%f", &x1); printf("Enter Value of Y1: "); scanf("%f", &y1); printf("Enter Value of X2: "); scanf("%f", &x2); printf("Enter Value of Y2: "); scanf("%f", &y2); dx = abs(x1 - x2); dy = abs(y1 - y2); p = 2 * dy - dx; if(x1 > x2) { x = x2; y = y2; end = x1; } else { x = x1; y = y1; end = x2; } putpixel(x, y, 10); while(x < end) { x = x + 1; if(p < 0) { p = p + 2 * dy; } else { y = y + 1; p = p + 2 * (dy - dx); } putpixel(x, y, 10); } getch(); closegraph(); }

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