Add Lab 2 and 3

Author: SakshamJr

Lab 2 Bresenham Circle Algorithm.CPP

@@ -0,0 +1,38 @@
+#include <stdio.h>
+#include <conio.h>
+#include <graphics.h>
+#include <math.h>
+
+void main()
+{
+int gd = DETECT, gm = DETECT;
+int x, y, p, q, d, r;
+initgraph(&gd, &gm, "C:\\TURBOC3\\BGI");
+printf("Enter Center of Circle(h,k): ");
+scanf("%d %d", &p, &q);
+printf("Enter radius of Circle(r): ");
+scanf("%d", &r);
+d = 3 - 2*r;
+x = 0;            // Initial point
+y = r;	    // define gareko
+while(x <= y){
+	putpixel(x+p, y+q, RED);
+	putpixel(x+p,-y+q, RED);
+	putpixel(-x+p,-y+q, RED);
+	putpixel(-x+p, y+q, RED);
+	putpixel(y+p, x+q, RED);
+	putpixel(y+p,-x+q, RED);
+	putpixel(-y+p, -x+q, RED);
+	putpixel(-y+p, x+q, RED);
+	if(d<=0){
+	x = x + 1;
+	d = d + 4*x + 6;
+	}
+	else{
+	x = x + 1;
+	y = y - 1;
+	d = d + 4*(x-y) + 10;
+	}
+}
+getch();
+}

Lab 2 Bresenham Line Algorithm.CPP

@@ -0,0 +1,39 @@
+#include <stdio.h>
+#include <conio.h>
+#include <graphics.h>
+
+void main()
+{
+	int gd = DETECT, gm = DETECT;
+	int x1, y1, x2, y2, i, dx, dy, p;
+	int x, y;
+	initgraph(&gd, &gm, "C:\\TURBOC3\\BGI");
+	printf("Enter Initial Point (x1, y1): ");
+	scanf("%d %d", &x1, &y1);
+	printf("Enter Final Point (x2, y2): ");
+	scanf("%d %d", &x2, &y2);
+	dx = x2 - x1;
+	dy = y2 - y1;
+	p = 2 * dy + dx;
+	x = x1; // Initial point
+	y = y1;
+	i = 0; // define gareko
+
+	while (i <= dx)
+	{
+		putpixel(x, y, WHITE);
+		if (p < 0)
+		{
+			x = x + 1;
+			p = p + 2 * dy;
+		}
+		else
+		{
+			x = x + 1;
+			y = y + 1;
+			p = p + 2 * dy - 2 * dx;
+		}
+		i = i + 1;
+	};
+	getch();
+}

Lab 3 Midpoint Circle Algorithm.CPP

@@ -0,0 +1,41 @@
+#include <stdio.h>
+#include <conio.h>
+#include <graphics.h>
+#include <math.h>
+
+void main()
+{
+    int gd = DETECT, gm = DETECT;
+    int xc, yc, r, p, x, y;
+    initgraph(&gd, &gm, "C:\\TURBOC3\\BGI");
+    printf("Enter the center of circle: ");
+    scanf("%d %d", &xc, &yc);
+    printf("Enter the radius of circle: ");
+    scanf("%d", &r);
+    p = 1 - r;
+    x = 0;
+    y = r;
+    while (x <= y)
+    {
+        putpixel(x + xc, y + yc, WHITE);
+        putpixel(x + xc, -y + yc, WHITE);
+        putpixel(-x + xc, -y + yc, WHITE);
+        putpixel(-x + xc, y + yc, WHITE);
+        putpixel(y + xc, x + yc, WHITE);
+        putpixel(y + xc, -x + yc, WHITE);
+        putpixel(-y + xc, -x + yc, WHITE);
+        putpixel(-y + xc, x + yc, WHITE);
+        if (p < 0)
+        {
+            x = x + 1;
+            p = p + 2 * x + 3;
+        }
+        else
+        {
+            x = x + 1;
+            y = y - 1;
+            p = p + 2 * (x - y) + 5;
+        }
+    }
+    getch();
+}