67 lines
2.0 KiB
Rust
67 lines
2.0 KiB
Rust
use crate::{Color, Vec2};
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use crate::abi::UiPanel;
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pub struct DrawContext {
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panel: UiPanel,
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}
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impl DrawContext {
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pub fn new(panel: UiPanel) -> Self {
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Self { panel }
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}
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pub fn draw_triangle(&self, v1: &Vec2, v2: &Vec2, v3: &Vec2, color: &Color) {
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self.panel.draw_triangle(v1, v2, v3, color)
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}
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pub fn draw_circle(&self, center: &Vec2, radius: f32, color: &Color) {
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use std::f32::consts::PI;
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let delta = PI / 16.0;
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let limit = PI * 2.0 + delta;
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let mut last_spoke = Vec2::new(radius + center.x, center.y);
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let mut theta = delta;
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while theta < limit {
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let new_spoke = Vec2::from_angle(theta) * radius + *center;
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self.draw_triangle(¢er, &last_spoke, &new_spoke, &color);
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last_spoke = new_spoke;
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theta += delta;
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}
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}
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pub fn draw_ring(&self, center: &Vec2, radius: f32, thickness: f32, color: &Color) {
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use std::f32::consts::PI;
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let delta = PI / 64.0;
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let limit = PI * 2.0 + delta;
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let mut last_spoke = glam::Vec2::new(radius + center.x, center.y);
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let mut last_theta = 0.0;
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let mut theta = delta;
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while theta < limit {
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let angle = Vec2::from_angle(theta);
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let new_spoke = angle * radius + *center;
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let new_spoke2 = angle * (radius + thickness) + *center;
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let last_spoke2 = Vec2::from_angle(last_theta) * (radius + thickness) + *center;
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self.draw_triangle(&new_spoke2, &last_spoke, &new_spoke, &color);
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self.draw_triangle(&new_spoke2, &last_spoke2, &last_spoke, &color);
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last_spoke = new_spoke;
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last_theta = theta;
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theta += delta;
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}
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}
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pub fn draw_rect(&self, xy: &Vec2, size: &Vec2, color: &Color) {
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let v1 = *xy;
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let v2 = v1 + Vec2::new(size.x, 0.0);
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let v3 = v1 + Vec2::new(0.0, size.y);
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let v4 = v1 + *size;
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self.draw_triangle(&v1, &v2, &v3, &color);
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self.draw_triangle(&v2, &v3, &v4, &color);
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}
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}
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