Initial import of plotters-svg-0.2.0. am: fed89f41ee am: a9dcd861f7 am: 9ae707820e

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/plotters-svg/+/1622511

Change-Id: I294e47486b8d918a1b868269534b4adeabc1a345

7 files changed, 910 insertions, 0 deletions

diff --git a/.cargo_vcs_info.json b/.cargo_vcs_info.json
new file mode 100644
index 0000000..4fca0e3
--- /dev/null
+++ b/.cargo_vcs_info.json
@@ -0,0 +1,5 @@
+{
+  "git": {
+    "sha1": "c234cc77ae27b92d341464a95c29aaeddc8cdd6f"
+  }
+}
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..6936990
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+/target
+**/*.rs.bk
+Cargo.lock
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..b641942
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,29 @@
+# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
+#
+# When uploading crates to the registry Cargo will automatically
+# "normalize" Cargo.toml files for maximal compatibility
+# with all versions of Cargo and also rewrite `path` dependencies
+# to registry (e.g., crates.io) dependencies
+#
+# If you believe there's an error in this file please file an
+# issue against the rust-lang/cargo repository. If you're
+# editing this file be aware that the upstream Cargo.toml
+# will likely look very different (and much more reasonable)
+
+[package]
+edition = "2018"
+name = "plotters-svg"
+version = "0.2.0"
+authors = ["Hao Hou <haohou302@gmail.com>"]
+description = "Plotters SVG backend"
+homepage = "https://plotters-rs.github.io"
+readme = "README.md"
+license = "MIT"
+repository = "https://github.com/plotters-rs/plotters-svg.git"
+[dependencies.plotters-backend]
+version = "^0.2.*"
+
+[dev-dependencies]
+
+[features]
+debug = []
diff --git a/Cargo.toml.orig b/Cargo.toml.orig
new file mode 100644
index 0000000..e563c52
--- /dev/null
+++ b/Cargo.toml.orig
@@ -0,0 +1,21 @@
+[package]
+name = "plotters-svg"
+version = "0.2.0"
+authors = ["Hao Hou <haohou302@gmail.com>"]
+edition = "2018"
+license = "MIT"
+description = "Plotters SVG backend"
+homepage = "https://plotters-rs.github.io"
+repository = "https://github.com/plotters-rs/plotters-svg.git"
+readme = "README.md"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+plotters-backend = "^0.2.*"
+
+[dev-dependencies]
+plotters = {path = "../plotters", default_features = false}
+
+[features]
+debug = []
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..41b18b2
--- /dev/null
+++ b/README.md
@@ -0,0 +1,8 @@
+# plotters-svg - The SVG backend for Plotters
+
+This is a part of plotters project. For more details, please check the following links:
+
+- For high-level intro of Plotters, see: [Plotters on crates.io](https://crates.io/crates/plotters)
+- Check the main repo at [Plotters repo](https://github.com/38/plotters.git)
+- For detailed documentation about this crate, check [plotters-backend on docs.rs](https://docs.rs/plotters-backend/)
+- You can also visit Plotters [Homepage](https://plotters-rs.github.io)
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..243117f
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,10 @@
+/*!
+   The Plotters SVG backend. 
+   
+   The plotters bitmap backend allows you to render images by Plotters into SVG vector graphs. 
+   
+   See the documentation for [SVGBackend](struct.SVGBackend.html) for more details.
+*/
+mod svg;
+
+pub use svg::SVGBackend;
diff --git a/src/svg.rs b/src/svg.rs
new file mode 100644
index 0000000..e6499e0
--- /dev/null
+++ b/src/svg.rs
@@ -0,0 +1,834 @@
+/*!
+The SVG image drawing backend
+*/
+
+use plotters_backend::{
+    text_anchor::{HPos, VPos},
+    BackendColor, BackendCoord, BackendStyle, BackendTextStyle, DrawingBackend, DrawingErrorKind,
+    FontStyle, FontTransform,
+};
+
+use std::fs::File;
+#[allow(unused_imports)]
+use std::io::Cursor;
+use std::io::{BufWriter, Error, Write};
+use std::path::Path;
+
+fn make_svg_color(color: BackendColor) -> String {
+    let (r, g, b) = color.rgb;
+    return format!("#{:02X}{:02X}{:02X}", r, g, b);
+}
+
+fn make_svg_opacity(color: BackendColor) -> String {
+    return format!("{}", color.alpha);
+}
+
+enum Target<'a> {
+    File(String, &'a Path),
+    Buffer(&'a mut String),
+    // TODO: At this point we won't make the breaking change
+    // so the u8 buffer is still supported. But in 0.3, we definitely
+    // should get rid of this.
+    #[cfg(feature = "deprecated_items")]
+    U8Buffer(String, &'a mut Vec<u8>),
+}
+
+impl Target<'_> {
+    fn get_mut(&mut self) -> &mut String {
+        match self {
+            Target::File(ref mut buf, _) => buf,
+            Target::Buffer(buf) => buf,
+            #[cfg(feature = "deprecated_items")]
+            Target::U8Buffer(ref mut buf, _) => buf,
+        }
+    }
+}
+
+enum SVGTag {
+    SVG,
+    Circle,
+    Line,
+    Polygon,
+    Polyline,
+    Rectangle,
+    Text,
+    #[allow(dead_code)]
+    Image,
+}
+
+impl SVGTag {
+    fn to_tag_name(&self) -> &'static str {
+        match self {
+            SVGTag::SVG => "svg",
+            SVGTag::Circle => "circle",
+            SVGTag::Line => "line",
+            SVGTag::Polyline => "polyline",
+            SVGTag::Rectangle => "rect",
+            SVGTag::Text => "text",
+            SVGTag::Image => "image",
+            SVGTag::Polygon => "polygon",
+        }
+    }
+}
+
+/// The SVG image drawing backend
+pub struct SVGBackend<'a> {
+    target: Target<'a>,
+    size: (u32, u32),
+    tag_stack: Vec<SVGTag>,
+    saved: bool,
+}
+
+impl<'a> SVGBackend<'a> {
+    fn escape_and_push(buf: &mut String, value: &str) {
+        value.chars().for_each(|c| match c {
+            '<' => buf.push_str("&lt;"),
+            '>' => buf.push_str("&gt;"),
+            '&' => buf.push_str("&amp;"),
+            '"' => buf.push_str("&quot;"),
+            '\'' => buf.push_str("&apos;"),
+            other => buf.push(other),
+        });
+    }
+    fn open_tag(&mut self, tag: SVGTag, attr: &[(&str, &str)], close: bool) {
+        let buf = self.target.get_mut();
+        buf.push_str("<");
+        buf.push_str(tag.to_tag_name());
+        for (key, value) in attr {
+            buf.push_str(" ");
+            buf.push_str(key);
+            buf.push_str("=\"");
+            Self::escape_and_push(buf, value);
+            buf.push_str("\"");
+        }
+        if close {
+            buf.push_str("/>\n");
+        } else {
+            self.tag_stack.push(tag);
+            buf.push_str(">\n");
+        }
+    }
+
+    fn close_tag(&mut self) -> bool {
+        if let Some(tag) = self.tag_stack.pop() {
+            let buf = self.target.get_mut();
+            buf.push_str("</");
+            buf.push_str(tag.to_tag_name());
+            buf.push_str(">\n");
+            return true;
+        }
+        false
+    }
+
+    fn init_svg_file(&mut self, size: (u32, u32)) {
+        self.open_tag(
+            SVGTag::SVG,
+            &[
+                ("width", &format!("{}", size.0)),
+                ("height", &format!("{}", size.1)),
+                ("viewBox", &format!("0 0 {} {}", size.0, size.1)),
+                ("xmlns", "http://www.w3.org/2000/svg"),
+            ],
+            false,
+        );
+    }
+
+    /// Create a new SVG drawing backend
+    pub fn new<T: AsRef<Path> + ?Sized>(path: &'a T, size: (u32, u32)) -> Self {
+        let mut ret = Self {
+            target: Target::File(String::default(), path.as_ref()),
+            size,
+            tag_stack: vec![],
+            saved: false,
+        };
+
+        ret.init_svg_file(size);
+        ret
+    }
+
+    /// Create a new SVG drawing backend and store the document into a u8 vector
+    #[cfg(feature = "deprecated_items")]
+    #[deprecated(
+        note = "This will be replaced by `with_string`, consider use `with_string` to avoid breaking change in the future"
+    )]
+    pub fn with_buffer(buf: &'a mut Vec<u8>, size: (u32, u32)) -> Self {
+        let mut ret = Self {
+            target: Target::U8Buffer(String::default(), buf),
+            size,
+            tag_stack: vec![],
+            saved: false,
+        };
+
+        ret.init_svg_file(size);
+
+        ret
+    }
+
+    /// Create a new SVG drawing backend and store the document into a String buffer
+    pub fn with_string(buf: &'a mut String, size: (u32, u32)) -> Self {
+        let mut ret = Self {
+            target: Target::Buffer(buf),
+            size,
+            tag_stack: vec![],
+            saved: false,
+        };
+
+        ret.init_svg_file(size);
+
+        ret
+    }
+}
+
+impl<'a> DrawingBackend for SVGBackend<'a> {
+    type ErrorType = Error;
+
+    fn get_size(&self) -> (u32, u32) {
+        self.size
+    }
+
+    fn ensure_prepared(&mut self) -> Result<(), DrawingErrorKind<Error>> {
+        Ok(())
+    }
+
+    fn present(&mut self) -> Result<(), DrawingErrorKind<Error>> {
+        if !self.saved {
+            while self.close_tag() {}
+            match self.target {
+                Target::File(ref buf, path) => {
+                    let outfile = File::create(path).map_err(DrawingErrorKind::DrawingError)?;
+                    let mut outfile = BufWriter::new(outfile);
+                    outfile
+                        .write_all(buf.as_ref())
+                        .map_err(DrawingErrorKind::DrawingError)?;
+                }
+                Target::Buffer(_) => {}
+                #[cfg(feature = "deprecated_items")]
+                Target::U8Buffer(ref actual, ref mut target) => {
+                    target.clear();
+                    target.extend_from_slice(actual.as_bytes());
+                }
+            }
+            self.saved = true;
+        }
+        Ok(())
+    }
+
+    fn draw_pixel(
+        &mut self,
+        point: BackendCoord,
+        color: BackendColor,
+    ) -> Result<(), DrawingErrorKind<Error>> {
+        if color.alpha == 0.0 {
+            return Ok(());
+        }
+        self.open_tag(
+            SVGTag::Rectangle,
+            &[
+                ("x", &format!("{}", point.0)),
+                ("y", &format!("{}", point.1)),
+                ("width", "1"),
+                ("height", "1"),
+                ("stroke", "none"),
+                ("opacity", &make_svg_opacity(color)),
+                ("fill", &make_svg_color(color)),
+            ],
+            true,
+        );
+        Ok(())
+    }
+
+    fn draw_line<S: BackendStyle>(
+        &mut self,
+        from: BackendCoord,
+        to: BackendCoord,
+        style: &S,
+    ) -> Result<(), DrawingErrorKind<Self::ErrorType>> {
+        if style.color().alpha == 0.0 {
+            return Ok(());
+        }
+        self.open_tag(
+            SVGTag::Line,
+            &[
+                ("opacity", &make_svg_opacity(style.color())),
+                ("stroke", &make_svg_color(style.color())),
+                ("stroke-width", &format!("{}", style.stroke_width())),
+                ("x1", &format!("{}", from.0)),
+                ("y1", &format!("{}", from.1)),
+                ("x2", &format!("{}", to.0)),
+                ("y2", &format!("{}", to.1)),
+            ],
+            true,
+        );
+        Ok(())
+    }
+
+    fn draw_rect<S: BackendStyle>(
+        &mut self,
+        upper_left: BackendCoord,
+        bottom_right: BackendCoord,
+        style: &S,
+        fill: bool,
+    ) -> Result<(), DrawingErrorKind<Self::ErrorType>> {
+        if style.color().alpha == 0.0 {
+            return Ok(());
+        }
+
+        let (fill, stroke) = if !fill {
+            ("none".to_string(), make_svg_color(style.color()))
+        } else {
+            (make_svg_color(style.color()), "none".to_string())
+        };
+
+        self.open_tag(
+            SVGTag::Rectangle,
+            &[
+                ("x", &format!("{}", upper_left.0)),
+                ("y", &format!("{}", upper_left.1)),
+                ("width", &format!("{}", bottom_right.0 - upper_left.0)),
+                ("height", &format!("{}", bottom_right.1 - upper_left.1)),
+                ("opacity", &make_svg_opacity(style.color())),
+                ("fill", &fill),
+                ("stroke", &stroke),
+            ],
+            true,
+        );
+
+        Ok(())
+    }
+
+    fn draw_path<S: BackendStyle, I: IntoIterator<Item = BackendCoord>>(
+        &mut self,
+        path: I,
+        style: &S,
+    ) -> Result<(), DrawingErrorKind<Self::ErrorType>> {
+        if style.color().alpha == 0.0 {
+            return Ok(());
+        }
+        self.open_tag(
+            SVGTag::Polyline,
+            &[
+                ("fill", "none"),
+                ("opacity", &make_svg_opacity(style.color())),
+                ("stroke", &make_svg_color(style.color())),
+                ("stroke-width", &format!("{}", style.stroke_width())),
+                (
+                    "points",
+                    &path.into_iter().fold(String::new(), |mut s, (x, y)| {
+                        s.push_str(&format!("{},{} ", x, y));
+                        s
+                    }),
+                ),
+            ],
+            true,
+        );
+        Ok(())
+    }
+
+    fn fill_polygon<S: BackendStyle, I: IntoIterator<Item = BackendCoord>>(
+        &mut self,
+        path: I,
+        style: &S,
+    ) -> Result<(), DrawingErrorKind<Self::ErrorType>> {
+        if style.color().alpha == 0.0 {
+            return Ok(());
+        }
+        self.open_tag(
+            SVGTag::Polygon,
+            &[
+                ("opacity", &make_svg_opacity(style.color())),
+                ("fill", &make_svg_color(style.color())),
+                (
+                    "points",
+                    &path.into_iter().fold(String::new(), |mut s, (x, y)| {
+                        s.push_str(&format!("{},{} ", x, y));
+                        s
+                    }),
+                ),
+            ],
+            true,
+        );
+        Ok(())
+    }
+
+    fn draw_circle<S: BackendStyle>(
+        &mut self,
+        center: BackendCoord,
+        radius: u32,
+        style: &S,
+        fill: bool,
+    ) -> Result<(), DrawingErrorKind<Self::ErrorType>> {
+        if style.color().alpha == 0.0 {
+            return Ok(());
+        }
+        let (stroke, fill) = if !fill {
+            (make_svg_color(style.color()), "none".to_string())
+        } else {
+            ("none".to_string(), make_svg_color(style.color()))
+        };
+        self.open_tag(
+            SVGTag::Circle,
+            &[
+                ("cx", &format!("{}", center.0)),
+                ("cy", &format!("{}", center.1)),
+                ("r", &format!("{}", radius)),
+                ("opacity", &make_svg_opacity(style.color())),
+                ("fill", &fill),
+                ("stroke", &stroke),
+                ("stroke-width", &format!("{}", style.stroke_width())),
+            ],
+            true,
+        );
+        Ok(())
+    }
+
+    fn draw_text<S: BackendTextStyle>(
+        &mut self,
+        text: &str,
+        style: &S,
+        pos: BackendCoord,
+    ) -> Result<(), DrawingErrorKind<Self::ErrorType>> {
+        let color = style.color();
+        if color.alpha == 0.0 {
+            return Ok(());
+        }
+
+        let (x0, y0) = pos;
+        let text_anchor = match style.anchor().h_pos {
+            HPos::Left => "start",
+            HPos::Right => "end",
+            HPos::Center => "middle",
+        };
+
+        let dy = match style.anchor().v_pos {
+            VPos::Top => "0.76em",
+            VPos::Center => "0.5ex",
+            VPos::Bottom => "-0.5ex",
+        };
+
+        #[cfg(feature = "debug")]
+        {
+            let ((fx0, fy0), (fx1, fy1)) =
+                font.layout_box(text).map_err(DrawingErrorKind::FontError)?;
+            let x0 = match style.anchor().h_pos {
+                HPos::Left => x0,
+                HPos::Center => x0 - fx1 / 2 + fx0 / 2,
+                HPos::Right => x0 - fx1 + fx0,
+            };
+            let y0 = match style.anchor().v_pos {
+                VPos::Top => y0,
+                VPos::Center => y0 - fy1 / 2 + fy0 / 2,
+                VPos::Bottom => y0 - fy1 + fy0,
+            };
+            self.draw_rect(
+                (x0, y0),
+                (x0 + fx1 - fx0, y0 + fy1 - fy0),
+                &crate::prelude::RED,
+                false,
+            )
+            .unwrap();
+            self.draw_circle((x0, y0), 2, &crate::prelude::RED, false)
+                .unwrap();
+        }
+
+        let mut attrs = vec![
+            ("x", format!("{}", x0)),
+            ("y", format!("{}", y0)),
+            ("dy", dy.to_owned()),
+            ("text-anchor", text_anchor.to_string()),
+            ("font-family", style.family().as_str().to_string()),
+            ("font-size", format!("{}", style.size() / 1.24)),
+            ("opacity", make_svg_opacity(color)),
+            ("fill", make_svg_color(color)),
+        ];
+
+        match style.style() {
+            FontStyle::Normal => {}
+            FontStyle::Bold => attrs.push(("font-weight", "bold".to_string())),
+            other_style => attrs.push(("font-style", other_style.as_str().to_string())),
+        };
+
+        let trans = style.transform();
+        match trans {
+            FontTransform::Rotate90 => {
+                attrs.push(("transform", format!("rotate(90, {}, {})", x0, y0)))
+            }
+            FontTransform::Rotate180 => {
+                attrs.push(("transform", format!("rotate(180, {}, {})", x0, y0)));
+            }
+            FontTransform::Rotate270 => {
+                attrs.push(("transform", format!("rotate(270, {}, {})", x0, y0)));
+            }
+            _ => {}
+        }
+
+        self.open_tag(
+            SVGTag::Text,
+            attrs
+                .iter()
+                .map(|(a, b)| (*a, b.as_ref()))
+                .collect::<Vec<_>>()
+                .as_ref(),
+            false,
+        );
+
+        Self::escape_and_push(self.target.get_mut(), text);
+        self.target.get_mut().push_str("\n");
+
+        self.close_tag();
+
+        Ok(())
+    }
+
+    #[cfg(all(not(target_arch = "wasm32"), feature = "image"))]
+    fn blit_bitmap<'b>(
+        &mut self,
+        pos: BackendCoord,
+        (w, h): (u32, u32),
+        src: &'b [u8],
+    ) -> Result<(), DrawingErrorKind<Self::ErrorType>> {
+        use image::png::PNGEncoder;
+
+        let mut data = vec![0; 0];
+
+        {
+            let cursor = Cursor::new(&mut data);
+
+            let encoder = PNGEncoder::new(cursor);
+
+            let color = image::ColorType::RGB(8);
+
+            encoder.encode(src, w, h, color).map_err(|e| {
+                DrawingErrorKind::DrawingError(Error::new(
+                    std::io::ErrorKind::Other,
+                    format!("Image error: {}", e),
+                ))
+            })?;
+        }
+
+        let padding = (3 - data.len() % 3) % 3;
+        for _ in 0..padding {
+            data.push(0);
+        }
+
+        let mut rem_bits = 0;
+        let mut rem_num = 0;
+
+        fn cvt_base64(from: u8) -> char {
+            (if from < 26 {
+                b'A' + from
+            } else if from < 52 {
+                b'a' + from - 26
+            } else if from < 62 {
+                b'0' + from - 52
+            } else if from == 62 {
+                b'+'
+            } else {
+                b'/'
+            })
+            .into()
+        }
+
+        let mut buf = String::new();
+        buf.push_str("data:png;base64,");
+
+        for byte in data {
+            let value = (rem_bits << (6 - rem_num)) | (byte >> (rem_num + 2));
+            rem_bits = byte & ((1 << (2 + rem_num)) - 1);
+            rem_num += 2;
+
+            buf.push(cvt_base64(value));
+            if rem_num == 6 {
+                buf.push(cvt_base64(rem_bits));
+                rem_bits = 0;
+                rem_num = 0;
+            }
+        }
+
+        for _ in 0..padding {
+            buf.pop();
+            buf.push('=');
+        }
+
+        self.open_tag(
+            SVGTag::Image,
+            &[
+                ("x", &format!("{}", pos.0)),
+                ("y", &format!("{}", pos.1)),
+                ("width", &format!("{}", w)),
+                ("height", &format!("{}", h)),
+                ("href", buf.as_str()),
+            ],
+            true,
+        );
+
+        Ok(())
+    }
+}
+
+impl Drop for SVGBackend<'_> {
+    fn drop(&mut self) {
+        if !self.saved {
+            // drop should not panic, so we ignore a failed present
+            let _ = self.present();
+        }
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+    use plotters::element::Circle;
+    use plotters::prelude::*;
+    use plotters::style::text_anchor::{HPos, Pos, VPos};
+    use std::fs;
+    use std::path::Path;
+
+    static DST_DIR: &str = "target/test/svg";
+
+    fn checked_save_file(name: &str, content: &str) {
+        /*
+          Please use the SVG file to manually verify the results.
+        */
+        assert!(!content.is_empty());
+        fs::create_dir_all(DST_DIR).unwrap();
+        let file_name = format!("{}.svg", name);
+        let file_path = Path::new(DST_DIR).join(file_name);
+        println!("{:?} created", file_path);
+        fs::write(file_path, &content).unwrap();
+    }
+
+    fn draw_mesh_with_custom_ticks(tick_size: i32, test_name: &str) {
+        let mut content: String = Default::default();
+        {
+            let root = SVGBackend::with_string(&mut content, (500, 500)).into_drawing_area();
+
+            let mut chart = ChartBuilder::on(&root)
+                .caption("This is a test", ("sans-serif", 20))
+                .set_all_label_area_size(40)
+                .build_ranged(0..10, 0..10)
+                .unwrap();
+
+            chart
+                .configure_mesh()
+                .set_all_tick_mark_size(tick_size)
+                .draw()
+                .unwrap();
+        }
+
+        checked_save_file(test_name, &content);
+
+        assert!(content.contains("This is a test"));
+    }
+
+    #[test]
+    fn test_draw_mesh_no_ticks() {
+        draw_mesh_with_custom_ticks(0, "test_draw_mesh_no_ticks");
+    }
+
+    #[test]
+    fn test_draw_mesh_negative_ticks() {
+        draw_mesh_with_custom_ticks(-10, "test_draw_mesh_negative_ticks");
+    }
+
+    #[test]
+    fn test_text_alignments() {
+        let mut content: String = Default::default();
+        {
+            let mut root = SVGBackend::with_string(&mut content, (500, 500));
+
+            let style = TextStyle::from(("sans-serif", 20).into_font())
+                .pos(Pos::new(HPos::Right, VPos::Top));
+            root.draw_text("right-align", &style, (150, 50)).unwrap();
+
+            let style = style.pos(Pos::new(HPos::Center, VPos::Top));
+            root.draw_text("center-align", &style, (150, 150)).unwrap();
+
+            let style = style.pos(Pos::new(HPos::Left, VPos::Top));
+            root.draw_text("left-align", &style, (150, 200)).unwrap();
+        }
+
+        checked_save_file("test_text_alignments", &content);
+
+        for svg_line in content.split("</text>") {
+            if let Some(anchor_and_rest) = svg_line.split("text-anchor=\"").nth(1) {
+                if anchor_and_rest.starts_with("end") {
+                    assert!(anchor_and_rest.contains("right-align"))
+                }
+                if anchor_and_rest.starts_with("middle") {
+                    assert!(anchor_and_rest.contains("center-align"))
+                }
+                if anchor_and_rest.starts_with("start") {
+                    assert!(anchor_and_rest.contains("left-align"))
+                }
+            }
+        }
+    }
+
+    #[test]
+    fn test_text_draw() {
+        let mut content: String = Default::default();
+        {
+            let root = SVGBackend::with_string(&mut content, (1500, 800)).into_drawing_area();
+            let root = root
+                .titled("Image Title", ("sans-serif", 60).into_font())
+                .unwrap();
+
+            let mut chart = ChartBuilder::on(&root)
+                .caption("All anchor point positions", ("sans-serif", 20))
+                .set_all_label_area_size(40)
+                .build_ranged(0..100, 0..50)
+                .unwrap();
+
+            chart
+                .configure_mesh()
+                .disable_x_mesh()
+                .disable_y_mesh()
+                .x_desc("X Axis")
+                .y_desc("Y Axis")
+                .draw()
+                .unwrap();
+
+            let ((x1, y1), (x2, y2), (x3, y3)) = ((-30, 30), (0, -30), (30, 30));
+
+            for (dy, trans) in [
+                FontTransform::None,
+                FontTransform::Rotate90,
+                FontTransform::Rotate180,
+                FontTransform::Rotate270,
+            ]
+            .iter()
+            .enumerate()
+            {
+                for (dx1, h_pos) in [HPos::Left, HPos::Right, HPos::Center].iter().enumerate() {
+                    for (dx2, v_pos) in [VPos::Top, VPos::Center, VPos::Bottom].iter().enumerate() {
+                        let x = 150_i32 + (dx1 as i32 * 3 + dx2 as i32) * 150;
+                        let y = 120 + dy as i32 * 150;
+                        let draw = |x, y, text| {
+                            root.draw(&Circle::new((x, y), 3, &BLACK.mix(0.5))).unwrap();
+                            let style = TextStyle::from(("sans-serif", 20).into_font())
+                                .pos(Pos::new(*h_pos, *v_pos))
+                                .transform(trans.clone());
+                            root.draw_text(text, &style, (x, y)).unwrap();
+                        };
+                        draw(x + x1, y + y1, "dood");
+                        draw(x + x2, y + y2, "dog");
+                        draw(x + x3, y + y3, "goog");
+                    }
+                }
+            }
+        }
+
+        checked_save_file("test_text_draw", &content);
+
+        assert_eq!(content.matches("dog").count(), 36);
+        assert_eq!(content.matches("dood").count(), 36);
+        assert_eq!(content.matches("goog").count(), 36);
+    }
+
+    #[test]
+    fn test_text_clipping() {
+        let mut content: String = Default::default();
+        {
+            let (width, height) = (500_i32, 500_i32);
+            let root = SVGBackend::with_string(&mut content, (width as u32, height as u32))
+                .into_drawing_area();
+
+            let style = TextStyle::from(("sans-serif", 20).into_font())
+                .pos(Pos::new(HPos::Center, VPos::Center));
+            root.draw_text("TOP LEFT", &style, (0, 0)).unwrap();
+            root.draw_text("TOP CENTER", &style, (width / 2, 0))
+                .unwrap();
+            root.draw_text("TOP RIGHT", &style, (width, 0)).unwrap();
+
+            root.draw_text("MIDDLE LEFT", &style, (0, height / 2))
+                .unwrap();
+            root.draw_text("MIDDLE RIGHT", &style, (width, height / 2))
+                .unwrap();
+
+            root.draw_text("BOTTOM LEFT", &style, (0, height)).unwrap();
+            root.draw_text("BOTTOM CENTER", &style, (width / 2, height))
+                .unwrap();
+            root.draw_text("BOTTOM RIGHT", &style, (width, height))
+                .unwrap();
+        }
+
+        checked_save_file("test_text_clipping", &content);
+    }
+
+    #[test]
+    fn test_series_labels() {
+        let mut content = String::default();
+        {
+            let (width, height) = (500, 500);
+            let root = SVGBackend::with_string(&mut content, (width, height)).into_drawing_area();
+
+            let mut chart = ChartBuilder::on(&root)
+                .caption("All series label positions", ("sans-serif", 20))
+                .set_all_label_area_size(40)
+                .build_ranged(0..50, 0..50)
+                .unwrap();
+
+            chart
+                .configure_mesh()
+                .disable_x_mesh()
+                .disable_y_mesh()
+                .draw()
+                .unwrap();
+
+            chart
+                .draw_series(std::iter::once(Circle::new((5, 15), 5, &RED)))
+                .expect("Drawing error")
+                .label("Series 1")
+                .legend(|(x, y)| Circle::new((x, y), 3, RED.filled()));
+
+            chart
+                .draw_series(std::iter::once(Circle::new((5, 15), 10, &BLUE)))
+                .expect("Drawing error")
+                .label("Series 2")
+                .legend(|(x, y)| Circle::new((x, y), 3, BLUE.filled()));
+
+            for pos in vec![
+                SeriesLabelPosition::UpperLeft,
+                SeriesLabelPosition::MiddleLeft,
+                SeriesLabelPosition::LowerLeft,
+                SeriesLabelPosition::UpperMiddle,
+                SeriesLabelPosition::MiddleMiddle,
+                SeriesLabelPosition::LowerMiddle,
+                SeriesLabelPosition::UpperRight,
+                SeriesLabelPosition::MiddleRight,
+                SeriesLabelPosition::LowerRight,
+                SeriesLabelPosition::Coordinate(70, 70),
+            ]
+            .into_iter()
+            {
+                chart
+                    .configure_series_labels()
+                    .border_style(&BLACK.mix(0.5))
+                    .position(pos)
+                    .draw()
+                    .expect("Drawing error");
+            }
+        }
+
+        checked_save_file("test_series_labels", &content);
+    }
+
+    #[test]
+    fn test_draw_pixel_alphas() {
+        let mut content = String::default();
+        {
+            let (width, height) = (100_i32, 100_i32);
+            let root = SVGBackend::with_string(&mut content, (width as u32, height as u32))
+                .into_drawing_area();
+            root.fill(&WHITE).unwrap();
+
+            for i in -20..20 {
+                let alpha = i as f64 * 0.1;
+                root.draw_pixel((50 + i, 50 + i), &BLACK.mix(alpha))
+                    .unwrap();
+            }
+        }
+
+        checked_save_file("test_draw_pixel_alphas", &content);
+    }
+}