episode 25 vector graphics processing

mike-kfed · mike-kfed · commit cf01e1f67cba · 2021-07-22T10:40:05.000+02:00
diff --git a/25_vector_graphics/python/cairodraw.py b/25_vector_graphics/python/cairodraw.py
@@ -0,0 +1,43 @@
+import cairo
+
+
+def draw(context):
+    x, y, x1, y1 = 0.1, 0.5, 0.4, 0.9
+    x2, y2, x3, y3 = 0.6, 0.1, 0.9, 0.5
+    context.scale(200, 200)
+    context.set_line_width(0.04)
+    context.move_to(x, y)
+    context.curve_to(x1, y1, x2, y2, x3, y3)
+    context.stroke()
+    context.set_source_rgba(1, 0.2, 0.2, 0.6)
+    context.set_line_width(0.02)
+    context.move_to(x, y)
+    context.line_to(x1, y1)
+    context.move_to(x2, y2)
+    context.line_to(x3, y3)
+    context.stroke()
+
+
+def draw_box(context, x, y, x2, y2):
+    context.set_source_rgb(0.258, 0.525, 0.956)
+    context.new_path()
+    context.move_to(x, y)
+    context.line_to(x2, y)
+    context.line_to(x, y2)
+    context.move_to(x2, y2)
+    context.line_to(x2, y)
+    context.line_to(x, y2)
+    context.close_path()
+    context.fill()
+
+
+if __name__ == "__main__":
+    with cairo.SVGSurface("example.svg", 200, 200) as surface:
+        context = cairo.Context(surface)
+        draw_box(context, 0., 0., 32., 32.)
+        draw(context)
+    with cairo.ImageSurface(cairo.FORMAT_ARGB32, 200, 200) as surface:
+        context = cairo.Context(surface)
+        draw_box(context, 0., 0., 32., 32.)
+        draw(context)
+        surface.write_to_png("output.png")
diff --git a/25_vector_graphics/rust/cairodraw/Cargo.toml b/25_vector_graphics/rust/cairodraw/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "cairodraw"
+version = "0.1.0"
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+cairo-rs = { version = "0.14", features = ["png", "svg"] }
diff --git a/25_vector_graphics/rust/cairodraw/src/main.rs b/25_vector_graphics/rust/cairodraw/src/main.rs
@@ -0,0 +1,54 @@
+fn draw(context: &cairo::Context) -> Result<(), Box<dyn std::error::Error>> {
+    let (x, y, x1, y1) = (0.1, 0.5, 0.4, 0.9);
+    let (x2, y2, x3, y3) = (0.6, 0.1, 0.9, 0.5);
+    context.scale(200., 200.);
+    context.set_line_width(0.04);
+    context.move_to(x, y);
+    context.curve_to(x1, y1, x2, y2, x3, y3);
+    context.stroke()?;
+    context.set_source_rgba(1., 0.2, 0.2, 0.6);
+    context.set_line_width(0.02);
+    context.move_to(x, y);
+    context.line_to(x1, y1);
+    context.move_to(x2, y2);
+    context.line_to(x3, y3);
+    context.stroke()?;
+    Ok(())
+}
+
+fn draw_box(
+    context: &cairo::Context,
+    x: f64,
+    y: f64,
+    x2: f64,
+    y2: f64,
+) -> Result<(), Box<dyn std::error::Error>> {
+    context.set_source_rgb(0.258, 0.525, 0.956);
+    context.new_path();
+    context.move_to(x, y);
+    context.line_to(x2, y);
+    context.line_to(x, y2);
+    context.move_to(x2, y2);
+    context.line_to(x2, y);
+    context.line_to(x, y2);
+    context.close_path();
+    context.fill()?;
+    Ok(())
+}
+
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let png_output_fn = "output.png";
+    let img_surface = cairo::ImageSurface::create(cairo::Format::ARgb32, 200, 200).unwrap();
+    let svg_fn = std::path::Path::new("output.svg");
+    let svg_surface = cairo::SvgSurface::new(200., 200., Some(svg_fn)).unwrap();
+    let img_ctx = cairo::Context::new(&img_surface)?;
+    let svg_ctx = cairo::Context::new(&svg_surface)?;
+
+    draw_box(&img_ctx, 0., 0., 32., 32.)?;
+    draw_box(&svg_ctx, 0., 0., 32., 32.)?;
+    draw(&img_ctx)?;
+    draw(&svg_ctx)?;
+    let mut file = std::fs::File::create(png_output_fn)?;
+    img_surface.write_to_png(&mut file).unwrap();
+    Ok(())
+}
