Initial implementation

1 files changed, 53 insertions, 0 deletions

diff --git a/src/utils.rs b/src/utils.rs
new file mode 100644
index 0000000..b6738d4
--- /dev/null
+++ b/src/utils.rs
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+/// Converts a percentage (0-100) to pixels based on the dimension
+#[inline]
+pub fn percent_to_pixel(percentage: f64, dimension: f64) -> f64 {
+    (percentage * dimension) / 100.0
+}
+
+/// Parses a hex color string to RGB components (0.0-1.0)
+pub fn parse_color(color: &str) -> (f64, f64, f64) {
+    let color = color.trim_start_matches('#');
+    if color.len() != 6 {
+        return (0.0, 0.0, 0.0); // Default to black on error
+    }
+
+    let r = u8::from_str_radix(&color[0..2], 16).unwrap_or(0) as f64 / 255.0;
+    let g = u8::from_str_radix(&color[2..4], 16).unwrap_or(0) as f64 / 255.0;
+    let b = u8::from_str_radix(&color[4..6], 16).unwrap_or(0) as f64 / 255.0;
+
+    (r, g, b)
+}
+
+/// Sets the cairo context color from a hex string
+pub fn set_color(ctx: &cairo::Context, color: &str) {
+    let (r, g, b) = parse_color(color);
+    ctx.set_source_rgb(r, g, b);
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_percent_to_pixel() {
+        assert_eq!(percent_to_pixel(0.0, 100.0), 0.0);
+        assert_eq!(percent_to_pixel(50.0, 100.0), 50.0);
+        assert_eq!(percent_to_pixel(100.0, 100.0), 100.0);
+        assert_eq!(percent_to_pixel(25.0, 1300.0), 325.0);
+    }
+
+    #[test]
+    fn test_parse_color() {
+        // Test white
+        assert_eq!(parse_color("#FFFFFF"), (1.0, 1.0, 1.0));
+
+        // Test black
+        assert_eq!(parse_color("#000000"), (0.0, 0.0, 0.0));
+
+        // Test custom color (#0F261F)
+        let (r, g, b) = parse_color("#0F261F");
+        assert!((r - 0.058823).abs() < 0.001); // 15/255
+        assert!((g - 0.149019).abs() < 0.001); // 38/255
+        assert!((b - 0.121568).abs() < 0.001); // 31/255
+    }
+}