Merge pull request #58 from barzamin/canvas-example

Add a canvas example

Author: NoraCodes

CHANGELOG.md

@@ -19,6 +19,7 @@ project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 * README.md now links to libui, and is more explanatory
 * `LayoutGrid::insert_at` no longer takes `left` and `height` arguments
 * Many APIs which took `u64` or `i64` arguments now take `i32` for wider compatibility
+* The semi-unstable `iui::draw` subsystem is again exported to downstream consumers of the `iui` crate.
 
 ### Deprecated
 

iui/examples/canvas.rs

@@ -0,0 +1,65 @@
+extern crate iui;
+extern crate ui_sys;
+
+use iui::controls::{
+    Area, AreaDrawParams, AreaHandler, HorizontalBox, LayoutStrategy,
+};
+use iui::draw::{Brush, Path, SolidBrush, FillMode};
+use iui::prelude::*;
+use std::f64::consts::PI;
+
+struct HandleCanvas {}
+impl AreaHandler for HandleCanvas {
+    fn draw(&mut self, _area: &Area, draw_params: &AreaDrawParams) {
+        let ctx = &draw_params.context;
+
+        let path = Path::new(ctx, FillMode::Winding);
+        path.add_rectangle(ctx, 0., 0., draw_params.area_width, draw_params.area_height);
+        path.end(ctx);
+
+        let brush = Brush::Solid(SolidBrush {
+            r: 0.2,
+            g: 0.6,
+            b: 0.8,
+            a: 1.,
+        });
+
+        draw_params.context.fill(&path, &brush);
+
+        let path = Path::new(ctx, FillMode::Winding);
+        for i in 0..100 {
+            let x = i as f64 / 100.;
+            let y = ((x * PI * 2.).sin() + 1.) / 2.;
+            path.add_rectangle(
+                ctx,
+                x * draw_params.area_width,
+                0.,
+                draw_params.area_width / 100.,
+                y * draw_params.area_height,
+            );
+        }
+        path.end(ctx);
+
+        let brush = Brush::Solid(SolidBrush {
+            r: 0.2,
+            g: 0.,
+            b: 0.3,
+            a: 1.,
+        });
+
+        draw_params.context.fill(&path, &brush);
+    }
+}
+
+fn main() {
+    let ui = UI::init().expect("Couldn't initialize UI library");
+    let mut win = Window::new(&ui, "Area Canvas Example", 200, 200, WindowType::NoMenubar);
+
+    let mut hbox = HorizontalBox::new(&ui);
+    let area = Area::new(&ui, Box::new(HandleCanvas {}));
+    hbox.append(&ui, area, LayoutStrategy::Stretchy);
+
+    win.set_child(&ui, hbox);
+    win.show(&ui);
+    ui.main();
+}

iui/src/controls/area.rs

@@ -2,8 +2,8 @@
 
 use controls::Control;
 use draw;
-use std::os::raw::c_int;
 use std::mem;
+use std::os::raw::c_int;
 use ui::UI;
 pub use ui_sys::uiExtKey as ExtKey;
 use ui_sys::{
@@ -30,11 +30,11 @@ impl RustAreaHandler {
     fn new(_ctx: &UI, trait_object: Box<AreaHandler>) -> Box<RustAreaHandler> {
         return Box::new(RustAreaHandler {
             ui_area_handler: uiAreaHandler {
-                Draw: draw,
-                MouseEvent: mouse_event,
-                MouseCrossed: mouse_crossed,
-                DragBroken: drag_broken,
-                KeyEvent: key_event,
+                Draw: Some(draw),
+                MouseEvent: Some(mouse_event),
+                MouseCrossed: Some(mouse_crossed),
+                DragBroken: Some(drag_broken),
+                KeyEvent: Some(key_event),
             },
             trait_object: trait_object,
         });
@@ -116,7 +116,7 @@ impl RustAreaHandler {
     }
 }
 
-define_control!{
+define_control! {
     /// A space on which the application can draw custom content.
     /// Area is a Control that represents a blank canvas that a program can draw on as
     /// it wishes. Areas also receive keyboard and mouse events, and programs can react
@@ -170,8 +170,8 @@ impl Area {
             let mut rust_area_handler = RustAreaHandler::new(ctx, area_handler);
             let area = Area::from_raw(ui_sys::uiNewScrollingArea(
                 &mut *rust_area_handler as *mut RustAreaHandler as *mut uiAreaHandler,
-                width,
-                height,
+                width as i32,
+                height as i32,
             ));
             mem::forget(rust_area_handler);
             area
@@ -188,7 +188,7 @@ impl Area {
     /// If called on a non-scrolling `Area`, this function's behavior is undefined.
     pub unsafe fn set_size(&self, _ctx: &UI, width: u64, height: u64) {
         // TODO: Check if the area is scrolling?
-        unsafe { ui_sys::uiAreaSetSize(self.uiArea, width as i64, height as i64) }
+        ui_sys::uiAreaSetSize(self.uiArea, width as i32, height as i32);
     }
 
     /// Queues the entire `Area` to be redrawn. This function returns immediately;
@@ -205,7 +205,7 @@ impl Area {
     /// If called on a non-scrolling `Area`, this function's behavior is undefined.
     pub unsafe fn scroll_to(&self, _ctx: &UI, x: f64, y: f64, width: f64, height: f64) {
         // TODO: Make some way to check whether the given area is scrolling or not.
-        unsafe { ui_sys::uiAreaScrollTo(self.uiArea, x, y, width, height) }
+        ui_sys::uiAreaScrollTo(self.uiArea, x, y, width, height);
     }
 }
 
@@ -253,11 +253,11 @@ impl AreaDrawParams {
 }
 
 bitflags! {
-    pub flags Modifiers: u8 {
-        const MODIFIER_CTRL = 1 << 0,
-        const MODIFIER_ALT = 1 << 1,
-        const MODIFIER_SHIFT = 1 << 2,
-        const MODIFIER_SUPER = 1 << 3,
+    pub struct Modifiers: u8 {
+        const MODIFIER_CTRL = 1 << 0;
+        const MODIFIER_ALT = 1 << 1;
+        const MODIFIER_SHIFT = 1 << 2;
+        const MODIFIER_SUPER = 1 << 3;
     }
 }
 

iui/src/controls/mod.rs

@@ -19,6 +19,8 @@ mod entry;
 pub use self::entry::*;
 mod progressbar;
 pub use self::progressbar::*;
+mod area;
+pub use self::area::*;
 
 /// A generic UI control. Any UI control can be turned into this type.
 ///

iui/src/draw/brush.rs

@@ -1,6 +1,6 @@
 use std::marker::PhantomData;
 use std::ptr;
-use ui::UI;
+use draw::DrawContext;
 use ui_sys::{self, uiDrawBrush};
 
 pub use ui_sys::uiDrawBrushGradientStop as BrushGradientStop;
@@ -22,7 +22,7 @@ pub struct BrushRef<'a> {
 }
 
 impl Brush {
-    pub fn as_ui_draw_brush_ref(&self, _ctx: &UI) -> BrushRef {
+    pub fn as_ui_draw_brush_ref(&self, _ctx: &DrawContext) -> BrushRef {
         match *self {
             Brush::Solid(ref solid_brush) => BrushRef {
                 ui_draw_brush: uiDrawBrush {

iui/src/draw/context.rs

@@ -1,5 +1,4 @@
 use draw::{Brush, Path, StrokeParams, Transform};
-use ui::UI;
 use ui_sys::{self, uiDrawContext};
 
 /// Drawing context, used to draw custom content on the screen.
@@ -20,10 +19,10 @@ impl DrawContext {
     }
 
     /// Draw a stroke on this DrawContext which runs along the given Path, with the given Brush and StrokeParams.
-    pub fn stroke(&self, ctx: &UI, path: &Path, brush: &Brush, stroke_params: &StrokeParams) {
+    pub fn stroke(&self, path: &Path, brush: &Brush, stroke_params: &StrokeParams) {
         unsafe {
-            let brush = brush.as_ui_draw_brush_ref(ctx);
-            let stroke_params = stroke_params.as_stroke_params_ref(ctx);
+            let brush = brush.as_ui_draw_brush_ref(self);
+            let stroke_params = stroke_params.as_stroke_params_ref(self);
             ui_sys::uiDrawStroke(
                 self.ui_draw_context,
                 path.ptr(),
@@ -34,25 +33,25 @@ impl DrawContext {
     }
 
     /// Draw a fill on this DrawContext using the given Path using the given Brush.
-    pub fn fill(&self, ctx: &UI, path: &Path, brush: &Brush) {
+    pub fn fill(&self, path: &Path, brush: &Brush) {
         unsafe {
-            let brush = brush.as_ui_draw_brush_ref(ctx);
+            let brush = brush.as_ui_draw_brush_ref(self);
             ui_sys::uiDrawFill(self.ui_draw_context, path.ptr(), brush.ptr())
         }
     }
 
     /// Transform this DrawContext by the given Transform.
-    pub fn transform(&self, _ctx: &UI, txform: &Transform) {
+    pub fn transform(&self, txform: &Transform) {
         unsafe { ui_sys::uiDrawTransform(self.ui_draw_context, txform.ptr()) }
     }
 
     /// Open a modal allowing the user to save the contents of this DrawContext.
-    pub fn save(&self, _ctx: &UI) {
+    pub fn save(&self) {
         unsafe { ui_sys::uiDrawSave(self.ui_draw_context) }
     }
 
     /// Open a modal allowing the user to load the contents of a DrawContext onto this one.
-    pub fn restore(&self, _ctx: &UI) {
+    pub fn restore(&self) {
         unsafe { ui_sys::uiDrawRestore(self.ui_draw_context) }
     }
 }

iui/src/draw/path.rs

@@ -1,8 +1,6 @@
+use draw::DrawContext;
 use std::os::raw::c_int;
-use ui::UI;
-use ui_sys::{self, uiDrawPath};
-
-pub use ui_sys::uiDrawFillMode as FillMode;
+use ui_sys::{self, uiDrawFillMode, uiDrawFillModeAlternate, uiDrawFillModeWinding, uiDrawPath};
 
 pub struct Path {
     ui_draw_path: *mut uiDrawPath,
@@ -14,22 +12,40 @@ impl Drop for Path {
     }
 }
 
+/// Represents the fill mode used when drawing a path.
+#[derive(Clone, Copy, PartialEq)]
+pub enum FillMode {
+    /// Draw using the [non-zero winding number fill rule](https://en.wikipedia.org/wiki/Nonzero-rule).
+    Winding,
+    /// Draw using the [even-odd fill rule](https://en.wikipedia.org/wiki/Even-odd_rule).
+    Alternate,
+}
+
+impl FillMode {
+    fn into_ui_fillmode(self) -> uiDrawFillMode {
+        return match self {
+            FillMode::Winding => uiDrawFillModeWinding,
+            FillMode::Alternate => uiDrawFillModeAlternate,
+        } as uiDrawFillMode;
+    }
+}
+
 impl Path {
-    pub fn new(_ctx: &UI, fill_mode: FillMode) -> Path {
+    pub fn new(_ctx: &DrawContext, fill_mode: FillMode) -> Path {
         unsafe {
             Path {
-                ui_draw_path: ui_sys::uiDrawNewPath(fill_mode),
+                ui_draw_path: ui_sys::uiDrawNewPath(fill_mode.into_ui_fillmode()),
             }
         }
     }
 
-    pub fn new_figure(&self, _ctx: &UI, x: f64, y: f64) {
+    pub fn new_figure(&self, _ctx: &DrawContext, x: f64, y: f64) {
         unsafe { ui_sys::uiDrawPathNewFigure(self.ui_draw_path, x, y) }
     }
 
     pub fn new_figure_with_arc(
         &self,
-        _ctx: &UI,
+        _ctx: &DrawContext,
         x_center: f64,
         y_center: f64,
         radius: f64,
@@ -50,13 +66,13 @@ impl Path {
         }
     }
 
-    pub fn line_to(&self, _ctx: &UI, x: f64, y: f64) {
+    pub fn line_to(&self, _ctx: &DrawContext, x: f64, y: f64) {
         unsafe { ui_sys::uiDrawPathLineTo(self.ui_draw_path, x, y) }
     }
 
     pub fn arc_to(
         &self,
-        _ctx: &UI,
+        _ctx: &DrawContext,
         x_center: f64,
         y_center: f64,
         radius: f64,
@@ -79,7 +95,7 @@ impl Path {
 
     pub fn bezier_to(
         &self,
-        _ctx: &UI,
+        _ctx: &DrawContext,
         c1x: f64,
         c1y: f64,
         c2x: f64,
@@ -90,15 +106,15 @@ impl Path {
         unsafe { ui_sys::uiDrawPathBezierTo(self.ui_draw_path, c1x, c1y, c2x, c2y, end_x, end_y) }
     }
 
-    pub fn close_figure(&self, _ctx: &UI) {
+    pub fn close_figure(&self, _ctx: &DrawContext) {
         unsafe { ui_sys::uiDrawPathCloseFigure(self.ui_draw_path) }
     }
 
-    pub fn add_rectangle(&self, _ctx: &UI, x: f64, y: f64, width: f64, height: f64) {
+    pub fn add_rectangle(&self, _ctx: &DrawContext, x: f64, y: f64, width: f64, height: f64) {
         unsafe { ui_sys::uiDrawPathAddRectangle(self.ui_draw_path, x, y, width, height) }
     }
 
-    pub fn end(&self, _ctx: &UI) {
+    pub fn end(&self, _ctx: &DrawContext) {
         unsafe { ui_sys::uiDrawPathEnd(self.ui_draw_path) }
     }
 

iui/src/draw/strokeparams.rs

@@ -1,6 +1,6 @@
-use std::os::raw::c_double;
 use std::marker::PhantomData;
-use ui::UI;
+use std::os::raw::c_double;
+use draw::DrawContext;
 use ui_sys::uiDrawStrokeParams;
 
 pub use ui_sys::uiDrawLineCap as LineCap;
@@ -23,7 +23,7 @@ pub struct StrokeParamsRef<'a> {
 }
 
 impl StrokeParams {
-    pub fn as_stroke_params_ref(&self, _ctx: &UI) -> StrokeParamsRef {
+    pub fn as_stroke_params_ref(&self, _ctx: &DrawContext) -> StrokeParamsRef {
         StrokeParamsRef {
             ui_draw_stroke_params: uiDrawStrokeParams {
                 Cap: self.cap,

iui/src/lib.rs

@@ -17,6 +17,8 @@
 //! For code examples, see the [examples](https://github.com/rust-native-ui/libui-rs/blob/master/iui/examples/) 
 //! directory.
 
+#[macro_use]
+extern crate bitflags;
 #[macro_use]
 extern crate failure;
 extern crate libc;