first commit

CS4451/proj1/image.cpp

@@ -0,0 +1,61 @@
+#include <math.h>
+#include <iostream>
+#include <stdlib.h>
+
+
+#include <vector>
+
+
+#include "defs.h"
+#include "functions.h"
+
+
+/* ----------- functionality of image class ---------- */
+
+image::image ( int m, int n ) : xsize(m), ysize(n)
+{
+    rgb = new RGB[m*n];
+}
+
+/* ----------------------- */
+
+RGB &image::pixel ( int i, int j )
+{
+    return rgb[i+xsize*j];
+}
+
+/* ----------------------- */
+
+int clampnround ( double x )
+{
+    if (x>255)
+        x = 255;
+    if (x<0) 
+        x = 0;
+    return (int)floor(x+.5);
+}
+
+ostream &operator<< ( ostream &ofs, RGB c )
+{
+    int rgb[3];
+    rgb[0] = clampnround(255*c.r);
+    rgb[1] = clampnround(255*c.g);
+    rgb[2] = clampnround(255*c.b);
+    ofs << rgb[0] << " " << rgb[1] << " " << rgb[2] << endl;
+    return ofs;
+}
+
+ostream &operator<< ( ostream &ofs, image i )
+{
+    int x,y;
+
+    ofs << "P3" << endl;
+    ofs << i.xsize << " " << i.ysize << endl;
+    ofs << "255" << endl;
+    for ( y=i.ysize-1; y>=0; y-- )
+        for ( x=0; x<i.xsize; x++ )
+            ofs << i.pixel(x,y);
+    return ofs;
+}
+
+/* -------- </image class> --------*/