Struct ChartLayout 

pub struct ChartLayout {
    pub width: f64,
    pub height: f64,
    pub x_offset: f64,
    pub y_start: f64,
    pub y_interval: f64,
    pub min_y: f64,
    pub max_y: f64,
}

Shared layout state for charts with numeric Y-axis and categorical X-axis.

Encapsulates the common chart setup pattern used by LineGraph.java and QualityBoxPlot.java: computing xOffset from Y-axis label widths, y_start from the Y interval, and the get_y() mapping function.

Fields

width: f64

height: f64

x_offset: f64

y_start: f64

y_interval: f64

min_y: f64

max_y: f64

Implementations

impl ChartLayout

pub fn new(min_y: f64, max_y: f64, y_interval: f64) -> Self

Create a chart layout by computing x_offset from Y-axis label widths.

pub fn get_y(&self, value: f64) -> f64

getY() maps a data value to a pixel Y coordinate. Matches Java: (getHeight()-40) - (int)(((getHeight()-80)/(maxY-minY))*(y-minY)) The inner multiplication result is truncated to int before subtraction. // JAVA COMPAT

pub fn base_width(&self, num_points: usize) -> f64

Calculate the width of each data column in the plot area. Uses floor() to match Java’s integer division truncation: int baseWidth = (getWidth()-(xOffset+10))/xLabels.length

pub fn half_base_width(&self, num_points: usize) -> f64

Half of base_width, truncated to match Java’s baseWidth/2 int division. // JAVA COMPAT

pub fn render_background(&self, svg: &mut String)

Render gray + white background rectangles matching Java’s JPanel default paint.

pub fn render_y_labels(&self, svg: &mut String)

Render Y-axis labels at each tick interval.

pub fn render_axes(&self, svg: &mut String)

Render the X and Y axis lines.

pub fn render_x_axis_label(&self, svg: &mut String, label: &str)

Render the X-axis label centered below the axis.

pub fn render_x_category_label_at( &self, svg: &mut String, label: &str, i: usize, base_width: f64, last_x_label_end: f64, ) -> f64

Render a single X-axis category label at position i, if it doesn’t overlap the previous label. Returns the updated last_x_label_end value.

pub fn render_gridlines(&self, svg: &mut String)

Render horizontal gridlines at each Y-axis tick.