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use super::core_shapes::*;
use super::styles::{DefinedDashStyle, DefinedStrokeStyle, FillStyle, Pattern};
use super::text::{DefinedFontDescription, FontDescription};
use super::types::DefinedCoreShapeContext;
pub trait Renderer {
fn move_to(&mut self, x: f64, y: f64);
fn stroke(&mut self);
fn fill(&mut self);
fn fill_preserve(&mut self);
fn set_pattern(&mut self, pattern: &Pattern);
fn set_dash(&mut self, dash: &DefinedDashStyle);
fn clear_dash(&mut self);
fn set_line_width(&mut self, width: f64);
fn line_to(&mut self, x: f64, y: f64);
fn rectangle(&mut self, x: f64, y: f64, width: f64, height: f64);
// For a font of size 1.
fn text_extents(&self, text: &str, font: &FontDescription) -> (f64, f64);
fn show_text(&mut self, text: &str, font: &DefinedFontDescription);
}
pub trait Render {
fn render(&self, context: DefinedCoreShapeContext, renderer: &mut dyn Renderer);
}
impl Render for DefinedCoreShape {
fn render(&self, context: DefinedCoreShapeContext, renderer: &mut dyn Renderer) {
match self {
Self::Rectangle(r) => r.render(context, renderer),
Self::Text(t) => t.render(context, renderer),
Self::StraightPath(p) => p.render(context, renderer),
}
}
}
fn draw(fill: &FillStyle, stroke: &DefinedStrokeStyle, renderer: &mut dyn Renderer) {
let stroking = !stroke.pattern.is_none();
if !fill.pattern.is_none() {
renderer.set_pattern(&fill.pattern);
if stroking {
renderer.fill_preserve();
} else {
renderer.fill();
}
}
if !stroke.pattern.is_none() {
renderer.set_pattern(&stroke.pattern);
renderer.set_line_width(stroke.line_width);
if let Some(dash) = &stroke.dash {
renderer.set_dash(dash);
}
renderer.stroke();
renderer.clear_dash();
}
}
impl Render for Rectangle {
fn render(&self, context: DefinedCoreShapeContext, renderer: &mut dyn Renderer) {
let bounds = &context.bounds;
renderer.rectangle(bounds.left, bounds.top, bounds.width, bounds.height);
draw(&context.fill, &context.stroke, renderer);
}
}
impl Render for DefinedText {
fn render(&self, context: DefinedCoreShapeContext, renderer: &mut dyn Renderer) {
// TODO: select font, style, text shaping (renderer specific), etc.
let bounds = &context.bounds;
//renderer.move_to(bounds.left, bounds.top + self.font.size);
renderer.move_to(bounds.left, bounds.top);
// TODO: ???
//draw(&context.fill, &context.stroke, renderer);
renderer.show_text(&self.content, &self.font);
}
}
impl Render for DefinedStraightPath {
fn render(&self, context: DefinedCoreShapeContext, renderer: &mut dyn Renderer) {
let mut iter = self.points.iter();
let first_point = match iter.next() {
Some(point) => point,
None => return,
};
renderer.move_to(first_point.x, first_point.y);
for point in iter {
renderer.line_to(point.x, point.y);
}
draw(&context.fill, &context.stroke, renderer);
}
}
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