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use wasm_bindgen::prelude::JsValue;
use wasm_bindgen::JsCast;
use web_sys::CanvasRenderingContext2d;
pub struct Canvas {
context: CanvasRenderingContext2d,
width: u32,
height: u32,
scaled_width: u32,
scaled_height: u32,
}
impl Canvas {
pub fn new(attr_id: &str, width: u32, height: u32) -> Canvas {
let document = web_sys::window().unwrap().document().unwrap();
let canvas = document.get_element_by_id(attr_id).unwrap();
let canvas: web_sys::HtmlCanvasElement = canvas
.dyn_into::<web_sys::HtmlCanvasElement>()
.unwrap();
let context = canvas
.get_context("2d")
.unwrap()
.unwrap()
.dyn_into::<web_sys::CanvasRenderingContext2d>()
.unwrap();
let scaled_width = canvas.width() / width;
let scaled_height = canvas.height() / height;
Canvas {
context,
width,
height,
scaled_width,
scaled_height,
}
}
pub fn clear(&self) {
self.context.set_fill_style(&JsValue::from_str("white"));
self.context.fill_rect(
f64::from(0),
f64::from(0),
f64::from(self.width * self.scaled_width),
f64::from(self.height * self.scaled_height)
);
}
pub fn draw(&self, x: u32, y: u32, color: &str) {
assert!(x < self.width);
assert!(y < self.height);
self.context.set_fill_style(&JsValue::from_str(color));
self.context.fill_rect(
f64::from(x * self.scaled_width),
f64::from(y * self.scaled_height),
f64::from(self.scaled_width),
f64::from(self.scaled_height)
);
}
}
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