libui 0.4.0

A native, cross-platform and lightweight UI toolkit.
Documentation 
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use draw::DrawContext;
use std::os::raw::c_int;
use libui_ffi::{self, uiDrawFillMode, uiDrawFillModeAlternate, uiDrawFillModeWinding, uiDrawPath};

pub struct Path {
    ui_draw_path: *mut uiDrawPath,
}

impl Drop for Path {
    fn drop(&mut self) {
        unsafe { libui_ffi::uiDrawFreePath(self.ui_draw_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: &DrawContext, fill_mode: FillMode) -> Path {
        unsafe {
            Path {
                ui_draw_path: libui_ffi::uiDrawNewPath(fill_mode.into_ui_fillmode()),
            }
        }
    }

    pub fn new_figure(&self, _ctx: &DrawContext, x: f64, y: f64) {
        unsafe { libui_ffi::uiDrawPathNewFigure(self.ui_draw_path, x, y) }
    }

    pub fn new_figure_with_arc(
        &self,
        _ctx: &DrawContext,
        x_center: f64,
        y_center: f64,
        radius: f64,
        start_angle: f64,
        sweep: f64,
        negative: bool,
    ) {
        unsafe {
            libui_ffi::uiDrawPathNewFigureWithArc(
                self.ui_draw_path,
                x_center,
                y_center,
                radius,
                start_angle,
                sweep,
                negative as c_int,
            )
        }
    }

    pub fn line_to(&self, _ctx: &DrawContext, x: f64, y: f64) {
        unsafe { libui_ffi::uiDrawPathLineTo(self.ui_draw_path, x, y) }
    }

    pub fn arc_to(
        &self,
        _ctx: &DrawContext,
        x_center: f64,
        y_center: f64,
        radius: f64,
        start_angle: f64,
        sweep: f64,
        negative: bool,
    ) {
        unsafe {
            libui_ffi::uiDrawPathArcTo(
                self.ui_draw_path,
                x_center,
                y_center,
                radius,
                start_angle,
                sweep,
                negative as c_int,
            )
        }
    }

    pub fn bezier_to(
        &self,
        _ctx: &DrawContext,
        c1x: f64,
        c1y: f64,
        c2x: f64,
        c2y: f64,
        end_x: f64,
        end_y: f64,
    ) {
        unsafe { libui_ffi::uiDrawPathBezierTo(self.ui_draw_path, c1x, c1y, c2x, c2y, end_x, end_y) }
    }

    pub fn close_figure(&self, _ctx: &DrawContext) {
        unsafe { libui_ffi::uiDrawPathCloseFigure(self.ui_draw_path) }
    }

    pub fn add_rectangle(&self, _ctx: &DrawContext, x: f64, y: f64, width: f64, height: f64) {
        unsafe { libui_ffi::uiDrawPathAddRectangle(self.ui_draw_path, x, y, width, height) }
    }

    pub fn end(&self, _ctx: &DrawContext) {
        unsafe { libui_ffi::uiDrawPathEnd(self.ui_draw_path) }
    }

    /// Return the underlying pointer for this Path.
    pub fn ptr(&self) -> *mut uiDrawPath {
        self.ui_draw_path
    }
}