+ const double dxy10 = dxy(j, i) / 10.0;\r
+ const double grayLevelFloat = 128.0 + 127.0 * cos(dxy10 - t / 7.0) / (dxy10 + 1);\r
+ const uchar grayLevel = (uchar)(long(grayLevelFloat) % 256);\r
+\r
+ ptrColor->x = grayLevel;\r
+ ptrColor->y = grayLevel;\r
+ ptrColor->z = grayLevel;\r
+\r
+ ptrColor->w = 255; // Opaque.\r