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QR-Code-generator
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Simplified Rust code to use += operator instead of String.push_str().

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Project Nayuki 2018-04-13 18:25:10 +00:00
parent 390198ea4b
commit ede63e8538
1 changed files with 10 additions and 10 deletions
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20
rust/src/lib.rs
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@ -238,13 +238,13 @@ impl QrCode {
pub fn to_svg_string(&self, border: i32) -> String { pub fn to_svg_string(&self, border: i32) -> String {
assert!(border >= 0, "Border must be non-negative"); assert!(border >= 0, "Border must be non-negative");
let mut result: String = String::new(); let mut result: String = String::new();
result.push_str("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"); result += "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n";
result.push_str("<!DOCTYPE svg PUBLIC \"-//W3C//DTD SVG 1.1//EN\" \"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd\">\n"); result += "<!DOCTYPE svg PUBLIC \"-//W3C//DTD SVG 1.1//EN\" \"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd\">\n";
let dimension = self.size.checked_add(border.checked_mul(2).unwrap()).unwrap(); let dimension = self.size.checked_add(border.checked_mul(2).unwrap()).unwrap();
result.push_str(&format!( result += &format!(
"<svg xmlns=\"http://www.w3.org/2000/svg\" version=\"1.1\" viewBox=\"0 0 {0} {0}\" stroke=\"none\">\n", dimension)); "<svg xmlns=\"http://www.w3.org/2000/svg\" version=\"1.1\" viewBox=\"0 0 {0} {0}\" stroke=\"none\">\n", dimension);
result.push_str("\t<rect width=\"100%\" height=\"100%\" fill=\"#FFFFFF\"/>\n"); result += "\t<rect width=\"100%\" height=\"100%\" fill=\"#FFFFFF\"/>\n";
result.push_str("\t<path d=\""); result += "\t<path d=\"";
let mut head: bool = true; let mut head: bool = true;
for y in -border .. self.size + border { for y in -border .. self.size + border {
for x in -border .. self.size + border { for x in -border .. self.size + border {
@ -252,14 +252,14 @@ impl QrCode {
if head { if head {
head = false; head = false;
} else { } else {
result.push_str(" "); result += " ";
} }
result.push_str(&format!("M{},{}h1v1h-1z", x + border, y + border)); result += &format!("M{},{}h1v1h-1z", x + border, y + border);
} }
} }
} }
result.push_str("\" fill=\"#000000\"/>\n"); result += "\" fill=\"#000000\"/>\n";
result.push_str("</svg>\n"); result += "</svg>\n";
result result
} }