draw_mask_texture.rs

use notan::draw::*;
use notan::prelude::*;

#[derive(AppState)]
struct State {
    img: Texture,
    count: f32,
}

#[notan_main]
fn main() -> Result<(), String> {
    notan::init_with(setup)
        .add_config(DrawConfig)
        .update(|app: &mut App, state: &mut State| state.count += 60.0 * app.timer.delta_f32())
        .draw(draw)
        .build()
}

fn setup(gfx: &mut Graphics) -> State {
    let texture = gfx
        .create_texture()
        .from_image(include_bytes!("assets/pattern.png"))
        .build()
        .unwrap();
    State {
        img: texture,
        count: 1.0,
    }
}

fn draw(gfx: &mut Graphics, state: &mut State) {
    // Draw some geometry as mask
    let mut mask = gfx.create_draw();
    mask.triangle((400.0, 100.0), (100.0, 500.0), (700.0, 500.0))
        .stroke(20.0);
    mask.circle(30.0).position(400.0, 350.0);
    mask.circle(50.0).position(400.0, 350.0).stroke(10.0);
    mask.circle(70.0).position(400.0, 350.0).stroke(10.0);

    let mut draw = gfx.create_draw();
    draw.clear(Color::new(0.1, 0.2, 0.3, 1.0));

    // Draw a pattern with the mask
    draw.mask(Some(&mask));
    draw.pattern(&state.img)
        .size(800.0, 600.0)
        .image_offset(-state.count, -state.count);
    draw.mask(None);

    gfx.render(&draw);
}