Rename gradients example to gradient

examples/gradient/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "gradients"
+version = "0.1.0"
+edition = "2021"
+publish = false
+
+[dependencies]
+iced = { path = "../.." }

examples/gradient/src/main.rs

@@ -0,0 +1,111 @@
+use iced::widget::{column, container, row, slider, text};
+use iced::{
+    gradient, Alignment, Background, BorderRadius, Color, Element, Length,
+    Radians, Sandbox, Settings,
+};
+
+pub fn main() -> iced::Result {
+    Gradient::run(Settings::default())
+}
+
+#[derive(Debug, Clone, Copy)]
+struct Gradient {
+    start: Color,
+    end: Color,
+    angle: f32,
+}
+
+#[derive(Debug, Clone, Copy)]
+enum Message {
+    StartChanged(Color),
+    EndChanged(Color),
+    AngleChanged(f32),
+}
+
+impl Sandbox for Gradient {
+    type Message = Message;
+
+    fn new() -> Self {
+        let start = Color::new(1.0, 1.0, 1.0, 1.0);
+        let end = Color::new(0.0, 0.0, 1.0, 1.0);
+
+        Self {
+            start,
+            end,
+            angle: 0.0,
+        }
+    }
+
+    fn title(&self) -> String {
+        String::from("Gradient")
+    }
+
+    fn update(&mut self, message: Message) {
+        match message {
+            Message::StartChanged(color) => self.start = color,
+            Message::EndChanged(color) => self.end = color,
+            Message::AngleChanged(angle) => self.angle = angle,
+        }
+    }
+
+    fn view(&self) -> Element<Message> {
+        let Self { start, end, angle } = *self;
+
+        let gradient_box = container(text(""))
+            .width(Length::Fill)
+            .height(Length::Fill)
+            .center_x()
+            .center_y()
+            .style(move |_: &_| {
+                let gradient = gradient::Linear::new(Radians(
+                    angle + std::f32::consts::PI,
+                ))
+                .add_stop(0.0, start)
+                .add_stop(1.0, end)
+                .into();
+
+                container::Appearance {
+                    text_color: None,
+                    background: Some(Background::Gradient(gradient)),
+                    border_radius: BorderRadius::default(),
+                    border_width: 0.0,
+                    border_color: Color::new(0.0, 0.0, 0.0, 0.0),
+                }
+            });
+
+        let angle_picker = row![
+            text("Angle").width(64),
+            slider(0.0..=std::f32::consts::PI * 2.0, self.angle, move |v| {
+                Message::AngleChanged(v)
+            })
+            .step(0.01)
+        ]
+        .spacing(8)
+        .padding(8)
+        .align_items(Alignment::Center);
+
+        column![
+            color_picker("Start", self.start).map(Message::StartChanged),
+            color_picker("End", self.end).map(Message::EndChanged),
+            angle_picker,
+            gradient_box
+        ]
+        .into()
+    }
+}
+
+fn color_picker(label: &str, color: Color) -> Element<'_, Color> {
+    row![
+        text(label).width(64),
+        slider(0.0..=1.0, color.r, move |r| { Color { r, ..color } })
+            .step(0.01),
+        slider(0.0..=1.0, color.g, move |g| { Color { g, ..color } })
+            .step(0.01),
+        slider(0.0..=1.0, color.b, move |b| { Color { b, ..color } })
+            .step(0.01),
+    ]
+    .spacing(8)
+    .padding(8)
+    .align_items(Alignment::Center)
+    .into()
+}