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Allow zooming font atlas

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This commit is contained in:
Emil Ernerfeldt 2019-01-17 17:33:20 -06:00
parent 88fdd127ea
commit 46293f6fd4
1 changed files with 66 additions and 23 deletions
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89
emigui/src/emigui.rs
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@ -2,8 +2,8 @@ use std::sync::Arc;
use crate::{
layout,
layout::{LayoutOptions, Region},
math::vec2,
layout::{show_popup, LayoutOptions, Region},
math::{clamp, remap_clamp, vec2},
mesher::Vertex,
style,
types::{Color, GuiCmd, GuiInput, PaintCmd},
@ -45,6 +45,69 @@ fn show_font_sizes(font_sizes: &mut FontSizes, gui: &mut Region) {
}
}
fn show_font_texture(texture: &Texture, gui: &mut Region) {
gui.add(label(format!(
"Font texture size: {} x {} (hover to zoom)",
texture.width, texture.height
)));
let size = vec2(texture.width as f32, texture.height as f32);
let interact = gui.reserve_space(size, None);
let rect = interact.rect;
let top_left = Vertex {
pos: rect.min(),
uv: (0, 0),
color: Color::WHITE,
};
let bottom_right = Vertex {
pos: rect.max(),
uv: (texture.width as u16 - 1, texture.height as u16 - 1),
color: Color::WHITE,
};
let mut frame = Frame::default();
frame.add_rect(top_left, bottom_right);
gui.add_graphic(GuiCmd::PaintCommands(vec![PaintCmd::Frame(frame)]));
if interact.hovered {
show_popup(gui.data(), gui.input().mouse_pos, |gui| {
let zoom_rect = gui.reserve_space(vec2(128.0, 128.0), None).rect;
let u = remap_clamp(
gui.input().mouse_pos.x,
rect.min().x,
rect.max().x,
0.0,
texture.width as f32 - 1.0,
)
.round();
let v = remap_clamp(
gui.input().mouse_pos.y,
rect.min().y,
rect.max().y,
0.0,
texture.height as f32 - 1.0,
)
.round();
let texel_radius = 32.0;
let u = clamp(u, texel_radius, texture.width as f32 - 1.0 - texel_radius);
let v = clamp(v, texel_radius, texture.height as f32 - 1.0 - texel_radius);
let top_left = Vertex {
pos: zoom_rect.min(),
uv: ((u - texel_radius) as u16, (v - texel_radius) as u16),
color: Color::WHITE,
};
let bottom_right = Vertex {
pos: zoom_rect.max(),
uv: ((u + texel_radius) as u16, (v + texel_radius) as u16),
color: Color::WHITE,
};
let mut frame = Frame::default();
frame.add_rect(top_left, bottom_right);
gui.add_graphic(GuiCmd::PaintCommands(vec![PaintCmd::Frame(frame)]));
});
}
}
/// Encapsulates input, layout and painting for ease of use.
pub struct Emigui {
pub last_input: RawInput,
@ -112,27 +175,7 @@ impl Emigui {
});
region.foldable("Fonts", |gui| {
let texture = self.texture();
gui.add(label(format!(
"Font texture size: {} x {}",
texture.width, texture.height
)));
let size = vec2(texture.width as f32, texture.height as f32);
let rect = gui.reserve_space(size, None).rect;
let top_left = Vertex {
pos: rect.min(),
uv: (0, 0),
color: Color::WHITE,
};
let bottom_right = Vertex {
pos: rect.max(),
uv: (texture.width as u16 - 1, texture.height as u16 - 1),
color: Color::WHITE,
};
let mut frame = Frame::default();
frame.add_rect(top_left, bottom_right);
gui.add_graphic(GuiCmd::PaintCommands(vec![PaintCmd::Frame(frame)]));
show_font_texture(self.texture(), gui);
let old_font_sizes = self.data.fonts.sizes();
let mut new_font_sizes = old_font_sizes.clone();
show_font_sizes(&mut new_font_sizes, gui);