2 files changed, 4 insertions(+), 4 deletions(-)

M README.md
M main.c

@@ 24,7 24,7 @@ bitart -o or_mod7.png "x y | 7 %"
 ```
 ![](or_mod7.png)
 ```
-bitart -o stripes.png -s 1024 'x#y#*x100/1+%'
+bitart -o stripes.png -s 1024 'x#y#*y100/1+%'
 ```
 ![](stripes.png)
 # description

@@ 192,15 192,15 @@ main(int ac, char **av)
 	/* stack cannot ever be larger than the program length, since there are
 	* no instructions which grow the stack by more than one */
 	unsigned int *stack = calloc(strlen(program), sizeof(*stack));
-	for (unsigned x = 1; x < width; x++)
-	for (unsigned y = 1; y < height; y++) {
+	for (unsigned y = 1; y < height; y++)
+	for (unsigned x = 1; x < width; x++) {
 		unsigned int *sp = eval(program, x, y, stack);
 		if (sp - stack < channels) {
 			fprintf(stderr, "insufficient values left on the stack\n");
 			exit(1);
 		}
 		for (int i = 0; i < channels; i++) {
-			data[((x * height) + y) * channels + i] =
+			data[(x + y * width) * channels + i] =
 				gradient ? stack[i] : ((!!stack[i]) != invert) ? -1 : 0;
 		}
 	}