snap text on shader

src/core/text.rs

@@ -2,16 +2,33 @@ use crate::prelude::*;
 
 pub struct Text {
     content: String,
+    attrs: TextAttrs,
+}
+
+impl Text {
+    pub fn size(mut self, size: impl UiNum) -> Self {
+        self.attrs.size = size.to_f32();
+        self
+    }
+    pub fn color(mut self, color: UiColor) -> Self {
+        self.attrs.color = color;
+        self
+    }
+    pub fn line_height(mut self, height: f32) -> Self {
+        self.attrs.line_height = height;
+        self
+    }
 }
 
 impl<Ctx> Widget<Ctx> for Text {
     fn draw(&self, painter: &mut Painter<Ctx>) {
-        painter.draw_text(&self.content);
+        painter.draw_text(&self.content, &self.attrs);
     }
 }
 
 pub fn text(text: impl Into<String>) -> Text {
     Text {
         content: text.into(),
+        attrs: TextAttrs::default(),
     }
 }