Create dda_n_lines.c

dda_n_lines.c

@@ -0,0 +1,85 @@
+// Implemented using Turbo C
+// Steps to enable Graphics Library in Turbo C.   
+// Option -> Linkers -> Libraries -> Graphics Library
+
+ #include<stdio.h>
+ #include<conio.h>
+ #include<math.h>
+ #include<graphics.h>
+
+ int Sign(int diff)
+ {
+	if(diff < 0)
+		return (-1);
+	else
+		return (1);
+       //	else
+	      //	return 0;
+ }
+
+ int DDA(float x1, float y1, float x2, float y2)
+ {
+	int i = 1;
+	float dx, dy, x, y, xinc, yinc, length;
+
+	dx = x2 - x1;
+	dy = y2 - y1;
+
+	if(abs(dx) >= abs(dy))
+		length = abs(dx);
+	else
+		length = abs(dy);
+
+	xinc = dx/length;
+	yinc = dy/length;
+
+	x = x1 + (0.5)*Sign(xinc);
+	y = y1 + (0.5)*Sign(yinc);
+
+   while(i <= length)
+	{
+	       //	Plot(Integer(x),Integer(y))
+		putpixel((int)x, (int)y, 3);
+
+		x = x + xinc;
+		y = y + yinc;
+
+		i = i + 1;
+	}
+	return 0;
+ }
+
+ int main()
+ {
+	int gd=DETECT,gm,i=1,n;
+	float x1,y1,x2,y2;
+
+	initgraph(&gd,&gm,"C:\\TC\\BGI");
+
+	printf("        ********** Line Plotting Program ********\n");
+	printf("                    DDA Line ALGORITHM\n");
+
+  printf("Enter Number of Lines"); //Eg: 6
+	scanf("%d",&n);
+
+  // To create a star put no of lines = 6 and enter follwoing values of (x1,y1) and (x2,y2)
+  // 200 400 250 300
+  // 250 300 300 400
+  // 200 400 300 400
+  // 200 325 300 325
+  // 300 325 250 425
+  // 200 325 250 425
+
+	for(i=1;i<=n;i++)
+	{
+		printf("Enter values of Start and End points (x1,y1) and (x2,y2):\n"); 
+		scanf("%f %f %f %f",&x1,&y1,&x2,&y2);
+		DDA(x1,y1,x2,y2);
+	}
+
+	printf("---------------------------------------------------------");
+
+	getch(); // If this line is giving error remove it.
+	closegraph();
+	return 0;
+ }