Can create canvas

canvas/Cargo.lock

@@ -0,0 +1,39 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "approx"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3f2a05fd1bd10b2527e20a2cd32d8873d115b8b39fe219ee25f42a8aca6ba278"
+dependencies = [
+ "num-traits",
+]
+
+[[package]]
+name = "autocfg"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cdb031dd78e28731d87d56cc8ffef4a8f36ca26c38fe2de700543e627f8a464a"
+
+[[package]]
+name = "canvas"
+version = "0.1.0"
+dependencies = [
+ "color",
+]
+
+[[package]]
+name = "color"
+version = "0.1.0"
+dependencies = [
+ "approx",
+]
+
+[[package]]
+name = "num-traits"
+version = "0.2.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9a64b1ec5cda2586e284722486d802acf1f7dbdc623e2bfc57e65ca1cd099290"
+dependencies = [
+ "autocfg",
+]

canvas/Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "canvas"
+version = "0.1.0"
+authors = ["Jon Janzen <jonjanzen@me.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+color = { path = "../color" }

canvas/src/lib.rs

@@ -0,0 +1,36 @@
+use color::Color;
+
+struct Canvas {
+    width: usize,
+    height: usize,
+    pixels: Vec<Vec<Color>>,
+}
+
+impl Canvas {
+    fn new(width: usize, height: usize) -> Canvas {
+        Canvas {
+            width,
+            height,
+            pixels : vec![vec![Color::new(0.0, 0.0, 0.0); width]; height],
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn create_canvas() {
+        let c = Canvas::new(10, 20);
+        assert_eq!(10, c.width);
+        assert_eq!(20, c.height);
+
+        let black = Color::new(0.0, 0.0, 0.0);
+        for row in c.pixels {
+            for pixel in row {
+                assert_eq!(black, pixel);
+            }
+        }
+    }
+}