mirror of
https://github.com/eliasstepanik/imgui-rs.git
synced 2026-01-12 14:08:37 +00:00
171d86aea1
- Rename WindowDrawList -> DrawListMut. It's not about window draw lists, but about background/foreground draw lists as well. The naming was not an easy choice, but seems like in rust it's a common convention to add a Mut suffix for mutable entities. Imgui-rs already has DrawList and it acts as an immutable reference type for rendering implementations to consume. Hence the name DrawListMut, which becomes a mutable reference to draw list with methods to modify it. - Add Ui::get_foreground_draw_list(). Same as Ui::get_background_draw_list() but for foreground. - Add draw_list example which shows the use of all three draw lists (window, bg, fg).
91 lines
2.9 KiB
Rust
91 lines
2.9 KiB
Rust
use imgui::*;
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mod support;
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// rect is [x, y, w, h]
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fn draw_text_centered(
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ui: &Ui,
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draw_list: &DrawListMut,
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rect: [f32; 4],
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text: &ImStr,
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color: [f32; 3],
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) {
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let text_size = ui.calc_text_size(text, false, 0.0);
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let cx = (rect[2] - text_size[0]) / 2.0;
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let cy = (rect[3] - text_size[1]) / 2.0;
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draw_list.add_text([rect[0] + cx, rect[1] + cy], color, text);
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}
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fn main() {
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let system = support::init(file!());
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system.main_loop(move |_, ui| {
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{
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let bg_draw_list = ui.get_background_draw_list();
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bg_draw_list
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.add_circle([150.0, 150.0], 150.0, [1.0, 0.0, 0.0])
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.thickness(4.0)
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.build();
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draw_text_centered(
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ui,
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&bg_draw_list,
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[0.0, 0.0, 300.0, 300.0],
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im_str!("background draw list"),
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[0.0, 0.0, 0.0],
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);
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}
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{
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let [w, h] = ui.io().display_size;
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let fg_draw_list = ui.get_foreground_draw_list();
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fg_draw_list
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.add_circle([w - 150.0, h - 150.0], 150.0, [1.0, 0.0, 0.0])
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.thickness(4.0)
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.build();
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draw_text_centered(
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ui,
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&fg_draw_list,
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[w - 300.0, h - 300.0, 300.0, 300.0],
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im_str!("foreground draw list"),
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[1.0, 0.0, 0.0],
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);
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}
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Window::new(im_str!("Draw list"))
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.size([300.0, 110.0], Condition::FirstUseEver)
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.scroll_bar(false)
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.build(ui, || {
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ui.button(im_str!("random button"), [0.0, 0.0]);
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let draw_list = ui.get_window_draw_list();
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let o = ui.cursor_screen_pos();
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let ws = ui.content_region_avail();
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draw_list
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.add_circle([o[0] + 10.0, o[1] + 10.0], 5.0, [1.0, 0.0, 0.0])
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.thickness(4.0)
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.build();
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draw_list
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.add_circle([o[0] + ws[0] - 10.0, o[1] + 10.0], 5.0, [0.0, 1.0, 0.0])
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.thickness(4.0)
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.build();
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draw_list
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.add_circle(
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[o[0] + ws[0] - 10.0, o[1] + ws[1] - 10.0],
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5.0,
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[0.0, 0.0, 1.0],
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)
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.thickness(4.0)
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.build();
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draw_list
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.add_circle([o[0] + 10.0, o[1] + ws[1] - 10.0], 5.0, [1.0, 1.0, 0.0])
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.thickness(4.0)
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.build();
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draw_text_centered(
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ui,
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&draw_list,
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[o[0], o[1], ws[0], ws[1]],
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im_str!("window draw list"),
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[1.0, 1.0, 1.0],
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);
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});
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});
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}
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