dataviz\figure\drawers/drawerbarchart.rs
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use crate::figure::{
canvas::{pixelcanvas::PixelCanvas, svgcanvas::SvgCanvas},
figuretypes::groupbarchart::GroupBarChart,
utilities::orientation::Orientation,
};
use ab_glyph::{FontRef, PxScale};
use imageproc::drawing::text_size;
use super::drawer::Drawer;
impl Drawer for GroupBarChart {
fn draw_svg(&mut self, svg_canvas: &mut SvgCanvas) {
let width = svg_canvas.width as f64;
let height = svg_canvas.height as f64;
let margin = svg_canvas.margin as f64;
let font_size = 12.0;
match self.orientation {
Orientation::Vertical => {
// Draw background
svg_canvas.draw_rect(0.0, 0.0, width, height, "white", "black", 1.0, 1.0);
// Draw Title
svg_canvas.draw_title(
width / 2.0,
margin / 2.0,
&self.title,
font_size * 2.0,
"black",
);
// Calculate unique axis values
let unique_x_values: Vec<u32> = self
.datasets
.iter()
.flat_map(|dataset| dataset.data.iter().map(|(x, _)| *x as u32))
.collect::<std::collections::BTreeSet<_>>()
.into_iter()
.collect();
let x_count = unique_x_values.len();
let y_max = self
.datasets
.iter()
.flat_map(|dataset| dataset.data.iter().map(|(_, y)| *y))
.fold(0.0_f64, |max, y| max.max(y));
// Calculate scales
let scale_x = (width - 2.0 * margin) / x_count as f64;
let scale_y = (height - 2.0 * margin) / y_max;
// Draw grid
svg_canvas.draw_grid(
margin,
width - margin,
margin,
height - margin,
10,
10,
"lightgray",
);
// Draw axes
let origin_x = margin;
let origin_y = height - margin;
svg_canvas.draw_line(origin_x, margin, origin_x, origin_y, "black", 2.0); // Y-axis
svg_canvas.draw_line(origin_x, origin_y, width - margin, origin_y, "black", 2.0); // X-axis
// Y-axis
let num_ticks = 10;
let mut y_axis_ticks = String::new();
for i in 0..=num_ticks {
let value = 0.0 + i as f64 * (y_max - 0.0) / num_ticks as f64;
let y = height - margin - i as f64 * (height - 2.0 * margin) / num_ticks as f64;
let tick_start_x = origin_x - 5.0;
let tick_end_x = origin_x + 5.0;
y_axis_ticks.push_str(&format!(
"M {:.2},{:.2} L {:.2},{:.2} ",
tick_start_x, y, tick_end_x, y
));
// Draw value as text (fallback to basic SVG <text>)
svg_canvas.elements.push(format!(
r#"<text x="{:.2}" y="{:.2}" font-size="{:.2}" text-anchor="end" fill="black">{:.1}</text>"#,
margin - 10.0, y + font_size * 0.3, font_size, value
));
}
svg_canvas.elements.push(format!(
r#"<path d="{}" stroke="black" stroke-width="1" fill="none"/>"#,
y_axis_ticks
));
// Draw X-axis labels and grouped bars
let group_width = scale_x * 0.8; // Width of each group of bars
let bar_width = group_width / self.datasets.len() as f64; // Width of each bar
for (group_index, x_label) in unique_x_values.iter().enumerate() {
let group_center_x = origin_x + (group_index as f64 + 0.4) * scale_x;
// let x = margin + group_index as f64 * (width - 2.0 * margin) / unique_x_values.len() as f64;
// Draw X-axis label
svg_canvas.draw_text(
group_center_x,
origin_y + font_size * 1.5,
&x_label.to_string(),
font_size,
"black",
);
// Draw bars for each dataset in the group
for (dataset_index, dataset) in self.datasets.iter().enumerate() {
if let Some(&(_, value)) = dataset
.data
.iter()
.find(|(x, _)| &(*x as u32).to_string() == &x_label.to_string())
{
let bar_height = value * scale_y;
let bar_left = group_center_x - group_width / 2.0
+ dataset_index as f64 * bar_width;
// Draw bar
svg_canvas.elements.push(format!(
r#"<rect x="{:.2}" y="{:.2}" width="{:.2}" height="{:.2}" fill="rgb({},{},{})" stroke="black" stroke-width="1"/>"#,
bar_left,
origin_y - bar_height,
bar_width,
bar_height,
dataset.color[0],
dataset.color[1],
dataset.color[2]
));
}
}
}
}
Orientation::Horizontal => {
let width = svg_canvas.width as f64;
let height = svg_canvas.height as f64;
let margin = svg_canvas.margin as f64;
let font_size = 12.0;
// Draw background
svg_canvas.draw_rect(0.0, 0.0, width, height, "white", "black", 1.0, 1.0);
// Draw Title
svg_canvas.draw_title(
width / 2.0,
margin / 2.0,
&self.title,
font_size * 2.0,
"black",
);
// Calculate unique axis values
let unique_y_values: Vec<u32> = self
.datasets
.iter()
.flat_map(|dataset| dataset.data.iter().map(|(y, _)| *y as u32))
.collect::<std::collections::BTreeSet<_>>()
.into_iter()
.collect();
let y_count = unique_y_values.len();
let x_max = self
.datasets
.iter()
.flat_map(|dataset| dataset.data.iter().map(|(_, x)| *x))
.fold(0.0_f64, |max, x| max.max(x));
// Calculate scales
let scale_y = (height - 2.0 * margin) / y_count as f64;
let scale_x = (width - 2.0 * margin) / x_max;
// Draw grid
svg_canvas.draw_grid(
margin,
width - margin,
margin,
height - margin,
10,
10,
"lightgray",
);
// Draw axes
let origin_x = margin;
let origin_y = height - margin;
svg_canvas.draw_line(origin_x, margin, origin_x, origin_y, "black", 2.0); // Y-axis
svg_canvas.draw_line(origin_x, origin_y, width - margin, origin_y, "black", 2.0); // X-axis
// Draw X-axis tick marks and labels
let num_ticks = 10;
let x_tick_step = x_max / num_ticks as f64;
for i in 0..=num_ticks {
let value_x = i as f64 * x_tick_step;
let tick_x = origin_x + (value_x * scale_x);
let x = margin + i as f64 * (width - 2.0 * margin) / num_ticks as f64;
// Draw tick line
svg_canvas.draw_line(tick_x, origin_y, tick_x, origin_y + 5.0, "black", 1.0);
// Draw tick label
svg_canvas.draw_text(
x,
origin_y + font_size * 1.5,
&format!("{:.1}", value_x),
font_size,
"black",
);
}
// Draw Y-axis labels and grouped bars
let group_height = scale_y * 0.8; // Height of each group of bars
let bar_height = group_height / self.datasets.len() as f64; // Height of each bar
for (group_index, y_label) in unique_y_values.iter().enumerate() {
let group_center_y = origin_y - (group_index as f64 + 0.5) * scale_y;
// Draw Y-axis label
svg_canvas.draw_text(
origin_x - font_size * 3.0,
group_center_y,
&y_label.to_string(),
font_size,
"black",
);
// Draw bars for each dataset in the group
for (dataset_index, dataset) in self.datasets.iter().enumerate() {
if let Some(&(_, value)) = dataset
.data
.iter()
.find(|(y, _)| &(*y as u32).to_string() == &y_label.to_string())
{
let bar_length = value * scale_x;
let bar_top = group_center_y - group_height / 2.0
+ dataset_index as f64 * bar_height;
// Draw bar
svg_canvas.elements.push(format!(
r#"<rect x="{:.2}" y="{:.2}" width="{:.2}" height="{:.2}" fill="rgb({},{},{})" stroke="black" stroke-width="1"/>"#,
origin_x,
bar_top,
bar_length,
bar_height,
dataset.color[0],
dataset.color[1],
dataset.color[2]
));
}
}
}
}
}
// Draw legend in the bottom-left corner
let legend_x_start = 5.0; // Start at the very left with margin spacing
let legend_y = height - margin / 2.0; // Move to bottom-left corner
let mut legend_x = legend_x_start;
let mut elements = String::new();
for dataset in &self.datasets {
elements.push_str(&format!(
r#"<rect x="{:.2}" y="{:.2}" width="{:.2}" height="{:.2}" fill="rgb({},{},{})"/>"#,
legend_x,
legend_y,
font_size,
font_size,
dataset.color[0],
dataset.color[1],
dataset.color[2]
));
elements.push_str(&format!(
r#"<text x="{:.2}" y="{:.2}" font-size="{:.2}" fill="black">{}</text>"#,
legend_x + font_size * 1.3,
legend_y + font_size - 2.0,
font_size,
dataset.label
));
legend_x += font_size * 5.0 + dataset.label.len() as f64 * font_size * 0.6;
}
svg_canvas.draw_rect(
legend_x_start - 5.0,
legend_y - 5.0,
legend_x - legend_x_start + 5.0,
font_size + 10.0,
"white",
"black",
0.5,
0.5,
);
svg_canvas.elements.push(elements);
}
fn draw(&mut self, canvas: &mut PixelCanvas) {
match self.orientation {
Orientation::Vertical => self.draw_vertical(canvas),
Orientation::Horizontal => self.draw_horizontal(canvas),
}
}
fn draw_legend(&self, canvas: &mut PixelCanvas) {
let font_bytes =
std::fs::read(self.config.font_label.clone()).expect("Failed to read font file");
let font = FontRef::try_from_slice(&font_bytes).unwrap();
let scale = PxScale { x: 10.0, y: 10.0 }; // Font size
let square_size = 10; // Size of the colored square
let padding = 5; // Space between the square and text
let line_height = 20; // Vertical space for each legend entry
let legend_margin = canvas.margin; // Margin from the bottom of the canvas
let mut x = canvas.margin;
let mut y = canvas.height - legend_margin; // Legend starts from the bottom
for dataset in &self.datasets {
let (w, h) = text_size(scale, &font, &dataset.label);
// Draw the square
for dy in 0..square_size {
for dx in 0..square_size {
canvas.draw_pixel(
x + dx,
y + square_size * 2 + dy + h, // Adjust to align above baseline
dataset.color,
);
}
}
// Draw the label text next to the square
let text_x: u32 = x + square_size + padding;
canvas.draw_text(
text_x,
y + 2 * square_size + h,
&dataset.label,
dataset.color,
&font,
scale,
);
// Move to the next legend entry
x += square_size + padding + w + padding;
if x > canvas.width - canvas.margin {
// If the width exceeds, wrap to the next row
x = canvas.margin;
y -= line_height;
}
}
}
}