1 files changed, 137 insertions, 0 deletions
diff --git a/src/graph_canvas.rs b/src/graph_canvas.rs
new file mode 100644
index 0000000..be5c4aa
--- /dev/null
+++ b/src/graph_canvas.rs
@@ -0,0 +1,137 @@
+use std::ops::{Index, IndexMut};
+//use std::io::IsTerminal;
+//dbg!(std::io::stdout().is_terminal());
+
+#[derive(Clone)]
+pub enum GraphPixel {
+    Normal(char),
+    Green(char),
+    Blank,
+}
+
+impl std::default::Default for GraphPixel {
+    fn default() -> Self {
+        GraphPixel::Blank
+    }
+}
+
+impl std::fmt::Display for GraphPixel {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        write!(
+            f,
+            "{}",
+            match self {
+                GraphPixel::Normal(c) => format!("{}", c),
+                GraphPixel::Green(c) => format!("\x1b[32m{}\x1b[0m", c),
+                GraphPixel::Blank => String::from(" "),
+            }
+        )
+    }
+}
+
+pub struct GraphCanvas<T> {
+    elements: Vec<T>,
+    width: usize,
+    height: usize,
+    draw_width: usize,
+    draw_height: usize,
+    col_offset: usize,
+    row_offset: usize,
+}
+
+impl<T: Clone + Default + std::fmt::Display> GraphCanvas<T> {
+    pub fn new(width: usize, height: usize) -> Self {
+        GraphCanvas::new_default(T::default(), width, height)
+    }
+
+    pub fn new_default(default: T, width: usize, height: usize) -> Self {
+        GraphCanvas {
+            elements: vec![default; width * height],
+            width,
+            height,
+            draw_width: width,
+            draw_height: height,
+            col_offset: 0,
+            row_offset: 0,
+        }
+    }
+
+    pub fn to_string(&self) -> String {
+        let mut out = String::with_capacity(self.height * (self.width + 1));
+        for (i, px) in self.elements.iter().enumerate() {
+            out.push_str(&px.to_string());
+            if (i + 1) % self.width == 0 && i < (self.height * self.width - 1) {
+                out.push('\n');
+            }
+        }
+        out
+    }
+
+    pub fn axis(&mut self, c1: T, c2: T, c3: T, c4: T, c5: T, c6: T) {
+        if self.height < 2 || self.width < 2 {
+            return;
+        }
+        for i in 0..self.height {
+            self.elements[i * self.width] = c1.clone();
+            self.elements[i * self.width + self.width - 1] = c1.clone();
+        }
+        for i in 1..self.width - 1 {
+            self.elements[i] = c2.clone();
+            self.elements[(self.height - 1) * self.width + i] = c2.clone();
+        }
+        self.elements[0] = c4.clone();
+        self.elements[self.width - 1] = c6.clone();
+        self.elements[(self.height - 1) * self.width] = c3.clone();
+        self.elements[self.height * self.width - 1] = c5.clone();
+        if self.draw_height > 2 {
+            self.draw_height = self.height - 2;
+        }
+        if self.draw_width > 2 {
+            self.draw_width = self.width - 2;
+        }
+        self.col_offset = 1;
+        self.row_offset = 1;
+    }
+
+    pub fn width(&self) -> usize {
+        self.draw_width
+    }
+
+    pub fn full_width(&self) -> usize {
+        self.width
+    }
+
+    pub fn height(&self) -> usize {
+        self.draw_height
+    }
+
+    pub fn full_height(&self) -> usize {
+        self.height
+    }
+
+    pub fn set(&mut self, x: usize, y: usize, px: T) {
+        let pos = y * self.width + x;
+        self.elements[pos] = px;
+    }
+
+    fn element_position(&self, row: usize, col: usize) -> usize {
+        (row + self.row_offset) * self.width + (col + self.col_offset)
+    }
+}
+
+impl<T: Clone + Default + std::fmt::Display> Index<(usize, usize)> for GraphCanvas<T> {
+    type Output = T;
+
+    fn index(&self, index: (usize, usize)) -> &Self::Output {
+        let (row, col) = index;
+        &self.elements[self.element_position(row, col)]
+    }
+}
+
+impl<T: Clone + Default + std::fmt::Display> IndexMut<(usize, usize)> for GraphCanvas<T> {
+    fn index_mut(&mut self, index: (usize, usize)) -> &mut Self::Output {
+        let (row, col) = index;
+        let pos = self.element_position(row, col);
+        &mut self.elements[pos]
+    }
+}