commit 038a25948fed2ddc964f1d08c34f104a2d721fc0
Author: sleptworld <qwin7989@gmail.com>
Date:   Thu Apr 27 08:37:42 2023 +0800

    painter

diff --git a/.gitignore b/.gitignore
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+ "windows_x86_64_gnu",
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..4093075
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,15 @@
+[package]
+name = "cinrad_g"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+cairo-rs = { version = "0.17.0", features = ["xlib"] }
+glib = "0.17.9"
+gtk = { version = "0.6.6", package = "gtk4", features = ["v4_8"] }
+# gtk = "0.15.5"
+
+plotters = "0.3.4"
+plotters-backend = "0.3.4"
diff --git a/src/backend.rs b/src/backend.rs
new file mode 100644
index 0000000..97e3a84
--- /dev/null
+++ b/src/backend.rs
@@ -0,0 +1,340 @@
+use cairo::{Context as CairoContext, FontSlant, FontWeight};
+
+use plotters_backend::text_anchor::{HPos, VPos};
+#[allow(unused_imports)]
+use plotters_backend::{
+    BackendColor, BackendCoord, BackendStyle, BackendTextStyle, DrawingBackend, DrawingErrorKind,
+    FontStyle, FontTransform,
+};
+
+/// The drawing backend that is backed with a Cairo context
+pub struct CairoBackend<'a> {
+    context: &'a CairoContext,
+    width: u32,
+    height: u32,
+    init_flag: bool,
+}
+
+#[derive(Debug)]
+pub struct CairoError;
+
+impl std::fmt::Display for CairoError {
+    fn fmt(&self, fmt: &mut std::fmt::Formatter) -> std::fmt::Result {
+        write!(fmt, "{:?}", self)
+    }
+}
+
+impl std::error::Error for CairoError {}
+
+impl<'a> CairoBackend<'a> {
+    fn set_color(&self, color: &BackendColor) {
+        self.context.set_source_rgba(
+            f64::from(color.rgb.0) / 255.0,
+            f64::from(color.rgb.1) / 255.0,
+            f64::from(color.rgb.2) / 255.0,
+            color.alpha,
+        );
+    }
+
+    fn set_stroke_width(&self, width: u32) {
+        self.context.set_line_width(f64::from(width));
+    }
+
+    fn set_font<S: BackendTextStyle>(&self, font: &S) {
+        match font.style() {
+            FontStyle::Normal => self.context.select_font_face(
+                font.family().as_str(),
+                FontSlant::Normal,
+                FontWeight::Normal,
+            ),
+            FontStyle::Bold => self.context.select_font_face(
+                font.family().as_str(),
+                FontSlant::Normal,
+                FontWeight::Bold,
+            ),
+            FontStyle::Oblique => self.context.select_font_face(
+                font.family().as_str(),
+                FontSlant::Oblique,
+                FontWeight::Normal,
+            ),
+            FontStyle::Italic => self.context.select_font_face(
+                font.family().as_str(),
+                FontSlant::Italic,
+                FontWeight::Normal,
+            ),
+        };
+        self.context.set_font_size(font.size());
+    }
+
+    pub fn new(context: &'a CairoContext, (w, h): (u32, u32)) -> Result<Self, CairoError> {
+        Ok(Self {
+            context,
+            width: w,
+            height: h,
+            init_flag: false,
+        })
+    }
+}
+
+impl<'a> DrawingBackend for CairoBackend<'a> {
+    type ErrorType = cairo::Error;
+
+    fn get_size(&self) -> (u32, u32) {
+        (self.width, self.height)
+    }
+
+    fn ensure_prepared(&mut self) -> Result<(), DrawingErrorKind<Self::ErrorType>> {
+        if !self.init_flag {
+            let (x0, y0, x1, y1) = self
+                .context
+                .clip_extents()
+                .map_err(DrawingErrorKind::DrawingError)?;
+
+            self.context.scale(
+                (x1 - x0) / f64::from(self.width),
+                (y1 - y0) / f64::from(self.height),
+            );
+
+            self.init_flag = true;
+        }
+
+        Ok(())
+    }
+
+    fn present(&mut self) -> Result<(), DrawingErrorKind<Self::ErrorType>> {
+        Ok(())
+    }
+
+    fn draw_pixel(
+        &mut self,
+        point: BackendCoord,
+        color: BackendColor,
+    ) -> Result<(), DrawingErrorKind<Self::ErrorType>> {
+        self.context
+            .rectangle(f64::from(point.0), f64::from(point.1), 1.0, 1.0);
+        self.context.set_source_rgba(
+            f64::from(color.rgb.0) / 255.0,
+            f64::from(color.rgb.1) / 255.0,
+            f64::from(color.rgb.2) / 255.0,
+            color.alpha,
+        );
+
+        self.context
+            .fill()
+            .map_err(DrawingErrorKind::DrawingError)?;
+
+        Ok(())
+    }
+
+    fn draw_line<S: BackendStyle>(
+        &mut self,
+        from: BackendCoord,
+        to: BackendCoord,
+        style: &S,
+    ) -> Result<(), DrawingErrorKind<Self::ErrorType>> {
+        self.set_color(&style.color());
+        self.set_stroke_width(style.stroke_width());
+
+        self.context.move_to(f64::from(from.0), f64::from(from.1));
+        self.context.line_to(f64::from(to.0), f64::from(to.1));
+
+        self.context
+            .stroke()
+            .map_err(DrawingErrorKind::DrawingError)?;
+
+        Ok(())
+    }
+
+    fn draw_rect<S: BackendStyle>(
+        &mut self,
+        upper_left: BackendCoord,
+        bottom_right: BackendCoord,
+        style: &S,
+        fill: bool,
+    ) -> Result<(), DrawingErrorKind<Self::ErrorType>> {
+        self.set_color(&style.color());
+        self.set_stroke_width(style.stroke_width());
+
+        self.context.rectangle(
+            f64::from(upper_left.0),
+            f64::from(upper_left.1),
+            f64::from(bottom_right.0 - upper_left.0),
+            f64::from(bottom_right.1 - upper_left.1),
+        );
+
+        if fill {
+            self.context
+                .fill()
+                .map_err(DrawingErrorKind::DrawingError)?;
+        } else {
+            self.context
+                .stroke()
+                .map_err(DrawingErrorKind::DrawingError)?;
+        }
+
+        Ok(())
+    }
+
+    fn draw_path<S: BackendStyle, I: IntoIterator<Item = BackendCoord>>(
+        &mut self,
+        path: I,
+        style: &S,
+    ) -> Result<(), DrawingErrorKind<Self::ErrorType>> {
+        self.set_color(&style.color());
+        self.set_stroke_width(style.stroke_width());
+
+        let mut path = path.into_iter();
+        if let Some((x, y)) = path.next() {
+            self.context.move_to(f64::from(x), f64::from(y));
+        }
+
+        for (x, y) in path {
+            self.context.line_to(f64::from(x), f64::from(y));
+        }
+
+        self.context
+            .stroke()
+            .map_err(DrawingErrorKind::DrawingError)?;
+
+        Ok(())
+    }
+
+    fn fill_polygon<S: BackendStyle, I: IntoIterator<Item = BackendCoord>>(
+        &mut self,
+        path: I,
+        style: &S,
+    ) -> Result<(), DrawingErrorKind<Self::ErrorType>> {
+        self.set_color(&style.color());
+        self.set_stroke_width(style.stroke_width());
+
+        let mut path = path.into_iter();
+
+        if let Some((x, y)) = path.next() {
+            self.context.move_to(f64::from(x), f64::from(y));
+
+            for (x, y) in path {
+                self.context.line_to(f64::from(x), f64::from(y));
+            }
+
+            self.context.close_path();
+            self.context
+                .fill()
+                .map_err(DrawingErrorKind::DrawingError)?;
+        }
+
+        Ok(())
+    }
+
+    fn draw_circle<S: BackendStyle>(
+        &mut self,
+        center: BackendCoord,
+        radius: u32,
+        style: &S,
+        fill: bool,
+    ) -> Result<(), DrawingErrorKind<Self::ErrorType>> {
+        self.set_color(&style.color());
+        self.set_stroke_width(style.stroke_width());
+
+        self.context.new_sub_path();
+        self.context.arc(
+            f64::from(center.0),
+            f64::from(center.1),
+            f64::from(radius),
+            0.0,
+            std::f64::consts::PI * 2.0,
+        );
+
+        if fill {
+            self.context
+                .fill()
+                .map_err(DrawingErrorKind::DrawingError)?;
+        } else {
+            self.context
+                .stroke()
+                .map_err(DrawingErrorKind::DrawingError)?;
+        }
+
+        Ok(())
+    }
+
+    fn estimate_text_size<S: BackendTextStyle>(
+        &self,
+        text: &str,
+        font: &S,
+    ) -> Result<(u32, u32), DrawingErrorKind<Self::ErrorType>> {
+        self.set_font(font);
+
+        let extents = self
+            .context
+            .text_extents(text)
+            .map_err(DrawingErrorKind::DrawingError)?;
+
+        Ok((extents.width() as u32, extents.height() as u32))
+    }
+
+    fn draw_text<S: BackendTextStyle>(
+        &mut self,
+        text: &str,
+        style: &S,
+        pos: BackendCoord,
+    ) -> Result<(), DrawingErrorKind<Self::ErrorType>> {
+        let color = style.color();
+        let (mut x, mut y) = (pos.0, pos.1);
+
+        let degree = match style.transform() {
+            FontTransform::None => 0.0,
+            FontTransform::Rotate90 => 90.0,
+            FontTransform::Rotate180 => 180.0,
+            FontTransform::Rotate270 => 270.0,
+            //FontTransform::RotateAngle(angle) => angle as f64,
+        } / 180.0
+            * std::f64::consts::PI;
+
+        if degree != 0.0 {
+            self.context
+                .save()
+                .map_err(DrawingErrorKind::DrawingError)?;
+            self.context.translate(f64::from(x), f64::from(y));
+            self.context.rotate(degree);
+
+            x = 0;
+            y = 0;
+        }
+
+        self.set_font(style);
+        self.set_color(&color);
+
+        let extents = self
+            .context
+            .text_extents(text)
+            .map_err(DrawingErrorKind::DrawingError)?;
+
+        let dx = match style.anchor().h_pos {
+            HPos::Left => 0.0,
+            HPos::Right => -extents.width(),
+            HPos::Center => -extents.width() / 2.0,
+        };
+        let dy = match style.anchor().v_pos {
+            VPos::Top => extents.height(),
+            VPos::Center => extents.height() / 2.0,
+            VPos::Bottom => 0.0,
+        };
+
+        self.context.move_to(
+            f64::from(x) + dx - extents.x_bearing(),
+            f64::from(y) + dy - extents.y_bearing() - extents.height(),
+        );
+
+        self.context
+            .show_text(text)
+            .map_err(DrawingErrorKind::DrawingError)?;
+
+        if degree != 0.0 {
+            self.context
+                .restore()
+                .map_err(DrawingErrorKind::DrawingError)?;
+        }
+
+        Ok(())
+    }
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..10728dd
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,72 @@
+use crate::backend::CairoBackend;
+use gtk::gdk::CairoContext;
+use gtk::{glib, Application, ApplicationWindow};
+use gtk::{prelude::*, DrawingArea};
+use plotters::prelude::*;
+
+use cairo::Context;
+
+pub mod backend;
+
+const APP_ID: &str = "org.gtk_rs.HelloWorld2";
+
+fn main() -> glib::ExitCode {
+    // Create a new application
+    let app = Application::builder().application_id(APP_ID).build();
+
+    // Connect to "activate" signal of `app`
+    app.connect_activate(build_ui);
+
+    // Run the application
+    app.run()
+}
+
+fn build_ui(app: &Application) {
+    // Create a window and set the title
+    let window = ApplicationWindow::builder()
+        .application(app)
+        .title("My GTK App")
+        .build();
+
+    let draw_area = DrawingArea::new();
+
+    draw_area.set_draw_func(|a, cr, width, height| {
+        draw(cr, 2000, 1000);
+    });
+
+    window.set_child(Some(&draw_area));
+    // Present window
+    window.present();
+}
+
+fn draw(ctx: &Context, width: u32, height: u32) -> Result<(), Box<dyn std::error::Error>> {
+    // let mut backend = root.fill(&WHITE)?;
+    let mut root = CairoBackend::new(ctx, (width, height))?.into_drawing_area();
+
+    let mut chart = ChartBuilder::on(&root)
+        .caption("y=x^2", ("sans-serif", 50).into_font())
+        .margin(5)
+        .x_label_area_size(30)
+        .y_label_area_size(30)
+        .build_cartesian_2d(-1f32..1f32, -0.1f32..1f32)?;
+
+    chart.configure_mesh().draw()?;
+
+    chart
+        .draw_series(LineSeries::new(
+            (-50..=50).map(|x| x as f32 / 50.0).map(|x| (x, x * x)),
+            &RED,
+        ))?
+        .label("y = x^2")
+        .legend(|(x, y)| PathElement::new(vec![(x, y), (x + 20, y)], &RED));
+
+    chart
+        .configure_series_labels()
+        .background_style(&WHITE.mix(0.8))
+        .border_style(&BLACK)
+        .draw()?;
+
+    root.present()?;
+
+    Ok(())
+}