fix: SVG and images were inverted

This is because I called commands with (x, y) instead of (y, x)
Fixes #47

src/convert/mod.rs

@@ -22,7 +22,8 @@ use crate::Module;
 /// For the square shape, the svg is `M{x},{y}h1v1h-1`
 ///
 /// ```rust
-/// fn square(y: usize, x: usize) -> String {
+/// # use fast_qr::Module;
+/// fn square(y: usize, x: usize, _module: Module) -> String {
 ///     format!("M{x},{y}h1v1h-1")
 /// }
 /// ```

src/convert/svg.rs

@@ -276,7 +276,7 @@ impl SvgBuilder {
                 }
 
                 for (i, command) in commands.iter().enumerate() {
-                    paths[i].push_str(&command(x + self.margin, y + self.margin, cell));
+                    paths[i].push_str(&command(y + self.margin, x + self.margin, cell));
                 }
             }
         }

src/tests/bytes.rs

@@ -8,7 +8,7 @@ fn it_can_output_to_bytes_from_image() {
     use crate::{QRBuilder, ECL};
 
     // Expected
-    let image_base64 = "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";
+    let image_base64 = "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";
     let expected_data_uri = format!("data:image/png;base64,{image_base64}");
 
     // Source

src/tests/svg.rs

@@ -20,3 +20,32 @@ fn it_embeds_an_image_via_data_uri() {
     let expected_href = format!(r#"href="{data_uri}""#);
     assert!(svg.contains(&expected_href));
 }
+
+#[cfg(feature = "svg")]
+#[test]
+fn check_svg_is_not_inverted() {
+    use crate::convert::svg::SvgBuilder;
+    use crate::convert::Builder;
+    use crate::{QRBuilder, Version, ECL};
+
+    let qrcode = QRBuilder::new("Test")
+        .ecl(ECL::M)
+        .version(Version::V01)
+        .build()
+        .unwrap();
+
+    const MARGIN: usize = 4;
+    let svg = SvgBuilder::default().margin(MARGIN).to_str(&qrcode);
+
+    let size = qrcode.size;
+    for y in 0..size {
+        for x in 0..size {
+            let index = y * size + x;
+            let expected = qrcode.data[index];
+            if expected.value() {
+                let expected = format!(r#"M{x},{y}"#, x = x + MARGIN, y = y + MARGIN);
+                assert!(svg.contains(&expected));
+            }
+        }
+    }
+}