<!DOCTYPE html><htmllang="en"><head><metacharset="utf-8"><metaname="viewport"content="width=device-width, initial-scale=1.0"><metaname="generator"content="rustdoc"><metaname="description"content="API documentation for the Rust `Canvas` struct in crate `widgetry`."><metaname="keywords"content="rust, rustlang, rust-lang, Canvas"><title>widgetry::Canvas - Rust</title><linkrel="stylesheet"type="text/css"href="../normalize.css"><linkrel="stylesheet"type="text/css"href="../rustdoc.css"id="mainThemeStyle"><linkrel="stylesheet"type="text/css"href="../light.css"id="themeStyle"><linkrel="stylesheet"type="text/css"href="../dark.css"disabled><linkrel="stylesheet"type="text/css"href="../ayu.css"disabled><scriptsrc="../storage.js"></script><noscript><linkrel="stylesheet"href="../noscript.css"></noscript><linkrel="shortcut icon"href="../favicon.ico"><styletype="text/css">#crate-search{background-image:url("../down-arrow.svg");}</style></head><bodyclass="rustdoc struct"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><navclass="sidebar"><divclass="sidebar-menu">☰</div><ahref='../widgetry/index.html'><divclass='logo-container rust-logo'><imgsrc='../rust-logo.png'alt='logo'></div></a><pclass='location'>Struct Canvas</p><divclass="sidebar-elems"><divclass="block items"><aclass="sidebar-title"href="#fields">Fields</a><divclass="sidebar-links"><ahref="#structfield.cam_x">cam_x</a><ahref="#structfield.cam_y">cam_y</a><ahref="#structfield.cam_zoom">cam_zoom</a><ahref="#structfield.covered_areas">covered_areas</a><ahref="#structfield.cursor">cursor</a><ahref="#structfield.drag_canvas_from">drag_canvas_from</a><ahref="#structfield.drag_just_ended">drag_just_ended</a><ahref="#structfield.edge_auto_panning">edge_auto_panning</a><ahref="#structfield.gui_scroll_speed">gui_scroll_speed</a><ahref="#structfield.invert_scroll">invert_scroll</a><ahref="#structfield.keys_to_pan">keys_to_pan</a><ahref="#structfield.lctrl_held">lctrl_held</a><ahref="#structfield.lshift_held">lshift_held</a><ahref="#structfield.map_dims">map_dims</a><ahref="#structfield.touchpad_to_move">touchpad_to_move</a><ahref="#structfield.window_has_cursor">window_has_cursor</a><ahref="#structfield.window_height">window_height</a><ahref="#structfield.window_width">window_width</a></div><aclass="sidebar-title"href="#implementations">Methods</a><divclass="sidebar-links"><ahref="#method.align_window">align_window</a><ahref="#method.center_on_map_pt">center_on_map_pt</a><ahref="#method.center_to_map_pt">center_to_map_pt</a><ahref="#method.center_to_screen_pt">center_to_screen_pt</a><ahref="#method.get_cursor">get_cursor</a><ahref="#method.get_cursor_in_map_space">get_cursor_in_map_space</a><ahref="#method.get_cursor_in_screen_space">get_cursor_in_screen_space</a><ahref="#method.get_inner_bounds">get_inner_bounds</a><ahref="#method.get_map_bounds">get_map_bounds</a><ahref="#method.get_screen_bounds">get_screen_bounds</a><ahref="#method.get_window_dims">get_window_dims</a><ahref="#method.handle_event">handle_event</a><ahref="#method.load_camera_state">load_camera_state</a><ahref="#method.map_to_screen">map_to_screen</a><ahref="#method.mark_covered_area">mark_covered_area</a><ahref="#method.min_zoom">min_zoom</a><ahref="#method.new">new</a><ahref="#method.save_camera_state">save_camera_state</a><ahref="#method.screen_to_map">screen_to_map</a><ahref="#method.start_drawing">start_drawing</a><ahref="#method.zoom">zoom</a></div><aclass="sidebar-title"href="#synthetic-implementations">Auto Trait Implementations</a><divclass="sidebar-links"><ahref="#impl-RefUnwindSafe">!RefUnwindSafe</a><ahref="#impl-Send">Send</a><ahref="#impl-Sync">!Sync</a><ahref="#impl-Unpin">Unpin</a><ahref="#impl-UnwindSafe">UnwindSafe</a></div><aclass="sidebar-title"href="#blanket-implementations">Blanket Implementations</a><divclass="sidebar-links"><ahref="#impl-Any">Any</a><ahref="#impl-Borrow%3CT%3E">Borrow<T></a><ahref="#
</div></div><h3id='impl-Downcast'class='impl'><codeclass='in-band'>impl<T> Downcast for T <spanclass="where fmt-newline">where<br> T: <aclass="trait"href="https://doc.rust-lang.org/nightly/core/any/trait.Any.html"title="trait core::any::Any">Any</a>, </span></code><ahref='#impl-Downcast'class='anchor'></a></h3><divclass='impl-items'><h4id='method.into_any'class="method hidden"><code>fn <ahref='#method.into_any'class='fnname'>into_any</a>(self: <aclass="struct"href="https://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html"title="struct alloc::boxed::Box">Box</a><T>) -><aclass="struct"href="https://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html"title="struct alloc::boxed::Box">Box</a><dyn <aclass="trait"href="https://doc.rust-lang.org/nightly/core/any/trait.Any.html"title="trait core::any::Any">Any</a> + 'static></code></h4><divclass='docblock hidden'><p>Convert <code>Box<dyn Trait></code> (where <code>Trait: Downcast</code>) to <code>Box<dyn Any></code>. <code>Box<dyn Any></code> can then be further <code>downcast</code> into <code>Box<ConcreteType></code> where <code>ConcreteType</code> implements <code>Trait</code>. <ahref="#tymethod.into_any">Read more</a></p>
</div><h4id='method.into_any_rc'class="method hidden"><code>fn <ahref='#method.into_any_rc'class='fnname'>into_any_rc</a>(self: <aclass="struct"href="https://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html"title="struct alloc::rc::Rc">Rc</a><T>) -><aclass="struct"href="https://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html"title="struct alloc::rc::Rc">Rc</a><dyn <aclass="trait"href="https://doc.rust-lang.org/nightly/core/any/trait.Any.html"title="trait core::any::Any">Any</a> + 'static></code></h4><divclass='docblock hidden'><p>Convert <code>Rc<Trait></code> (where <code>Trait: Downcast</code>) to <code>Rc<Any></code>. <code>Rc<Any></code> can then be further <code>downcast</code> into <code>Rc<ConcreteType></code> where <code>ConcreteType</code> implements <code>Trait</code>. <ahref="#tymethod.into_any_rc">Read more</a></p>
</div><h4id='method.as_any'class="method hidden"><code>fn <ahref='#method.as_any'class='fnname'>as_any</a>(&self) ->&(dyn <aclass="trait"href="https://doc.rust-lang.org/nightly/core/any/trait.Any.html"title="trait core::any::Any">Any</a> + 'static)</code></h4><divclass='docblock hidden'><p>Convert <code>&Trait</code> (where <code>Trait: Downcast</code>) to <code>&Any</code>. This is needed since Rust cannot generate <code>&Any</code>'s vtable from <code>&Trait</code>'s. <ahref="#tymethod.as_any">Read more</a></p>
</div><h4id='method.as_any_mut'class="method hidden"><code>fn <ahref='#method.as_any_mut'class='fnname'>as_any_mut</a>(&mut self) ->&mut (dyn <aclass="trait"href="https://doc.rust-lang.org/nightly/core/any/trait.Any.html"title="trait core::any::Any">Any</a> + 'static)</code></h4><divclass='docblock hidden'><p>Convert <code>&mut Trait</code> (where <code>Trait: Downcast</code>) to <code>&Any</code>. This is needed since Rust cannot generate <code>&mut Any</code>'s vtable from <code>&mut Trait</code>'s. <ahref="#tymethod.as_any_mut">Read more</a></p>
</div></div><h3id='impl-DowncastSync'class='impl'><codeclass='in-band'>impl<T> DowncastSync for T <spanclass="where fmt-newline">where<br> T: <aclass="trait"href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html"title="trait core::marker::Send">Send</a> + <aclass="trait"href="https://doc.rust-lang.org/nightly/core/marker/trait.Sync.html"title="trait core::marker::Sync">Sync</a> + <aclass="trait"href="https://doc.rust-lang.org/nightly/core/any/trait.Any.html"title="trait core::any::Any">Any</a>, </span></code><ahref='#impl-DowncastSync'class='anchor'></a></h3><divclass='impl-items'><h4id='method.into_any_arc'class="method hidden"><code>fn <ahref='#method.into_any_arc'class='fnname'>into_any_arc</a>(self: <aclass="struct"href="https://doc.rust-lang.org/nightly/alloc/sync/struct.Arc.html"title="struct alloc::sync::Arc">Arc</a><T>) -><aclass="struct"href="https://doc.rust-lang.org/nightly/alloc/sync/struct.Arc.html"title="struct alloc::sync::Arc">Arc</a><dyn <aclass="trait"href="https://doc.rust-lang.org/nightly/core/any/trait.Any.html"title="trait core::any::Any">Any</a> + 'static + <aclass="trait"href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html"title="trait core::marker::Send">Send</a> + <aclass="trait"href="https://doc.rust-lang.org/nightly/core/marker/trait.Sync.html"title="trait core::marker::Sync">Sync</a>></code></h4><divclass='docblock hidden'><p>Convert <code>Arc<Trait></code> (where <code>Trait: Downcast</code>) to <code>Arc<Any></code>. <code>Arc<Any></code> can then be further <code>downcast</code> into <code>Arc<ConcreteType></code> where <code>ConcreteType</code> implements <code>Trait</code>. <ahref="#tymethod.into_any_arc">Read more</a></p>
</div></div><h3id='impl-From%3CT%3E'class='impl'><codeclass='in-band'>impl<T><aclass="trait"href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html"title="trait core::convert::From">From</a><T> for T</code><ahref='#impl-From%3CT%3E'class='anchor'></a><aclass='srclink'href='https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#570-574'title='goto source code'>[src]</a></h3><divclass='impl-items'><h4id='method.from'class="method hidden"><code>fn <ahref='https://doc.rust-lang.org/nightly/core/convert/trait.From.html#tymethod.from'class='fnname'>from</a>(t: T) -> T</code><aclass='srclink'href='https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#571-573'title='goto source code'>[src]</a></h4><divclass='docblock hidden'><p>Performs the conversion.</p>
</div></div><h3id='impl-Into%3CU%3E'class='impl'><codeclass='in-band'>impl<T, U><aclass="trait"href="https://doc.rust-lang.org/nightly/core/convert/trait.Into.html"title="trait core::convert::Into">Into</a><U> for T <spanclass="where fmt-newline">where<br> U: <aclass="trait"href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html"title="trait core::convert::From">From</a><T>, </span></code><ahref='#impl-Into%3CU%3E'class='anchor'></a><aclass='srclink'href='https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#559-566'title='goto source code'>[src]</a></h3><divclass='impl-items'><h4id='method.into'class="method hidden"><code>fn <ahref='https://doc.rust-lang.org/nightly/core/convert/trait.Into.html#tymethod.into'class='fnname'>into</a>(self) -> U</code><aclass='srclink'href='https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#563-565'title='goto source code'>[src]</a></h4><divclass='docblock hidden'><p>Performs the conversion.</p>
</div></div><h3id='impl-TryFrom%3CU%3E'class='impl'><codeclass='in-band'>impl<T, U><aclass="trait"href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html"title="trait core::convert::TryFrom">TryFrom</a><U> for T <spanclass="where fmt-newline">where<br> U: <aclass="trait"href="https://doc.rust-lang.org/nightly/core/convert/trait.Into.html"title="trait core::convert::Into">Into</a><T>, </span></code><ahref='#impl-TryFrom%3CU%3E'class='anchor'></a><aclass='srclink'href='https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#607-616'title='goto source code'>[src]</a></h3><divclass='impl-items'><h4id='associatedtype.Error'class="type"><code>type <ahref='https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error'class="type">Error</a> = <aclass="enum"href="https://doc.rust-lang.org/nightly/core/convert/enum.Infallible.html"title="enum core::convert::Infallible">Infallible</a></code></h4><divclass='docblock'><p>The type returned in the event of a conversion error.</p>
</div><h4id='method.try_from'class="method hidden"><code>fn <ahref='https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#tymethod.try_from'class='fnname'>try_from</a>(value: U) -><aclass="enum"href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html"title="enum core::result::Result">Result</a><T, <T as <aclass="trait"href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html"title="trait core::convert::TryFrom">TryFrom</a><U>>::<aclass="type"href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error"title="type core::convert::TryFrom::Error">Error</a>></code><aclass='srclink'href='https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#613-615'title='goto source code'>[src]</a></h4><divclass='docblock hidden'><p>Performs the conversion.</p>
</div></div><h3id='impl-TryInto%3CU%3E'class='impl'><codeclass='in-band'>impl<T, U><aclass="trait"href="https://doc.rust-lang.org/nightly/core/convert/trait.TryInto.html"title="trait core::convert::TryInto">TryInto</a><U> for T <spanclass="where fmt-newline">where<br> U: <aclass="trait"href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html"title="trait core::convert::TryFrom">TryFrom</a><T>, </span></code><ahref='#impl-TryInto%3CU%3E'class='anchor'></a><aclass='srclink'href='https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#593-602'title='goto source code'>[src]</a></h3><divclass='impl-items'><h4id='associatedtype.Error-1'class="type"><code>type <ahref='https://doc.rust-lang.org/nightly/core/convert/trait.TryInto.html#associatedtype.Error'class="type">Error</a> = <U as <aclass="trait"href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html"title="trait core::convert::TryFrom">TryFrom</a><T>>::<aclass="type"href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error"title="type core::convert::TryFrom::Error">Error</a></code></h4><divclass='docblock'><p>The type returned in the event of a conversion error.</p>
</div><h4id='method.try_into'class="method hidden"><code>fn <ahref='https://doc.rust-lang.org/nightly/core/convert/trait.TryInto.html#tymethod.try_into'class='fnname'>try_into</a>(self) -><aclass="enum"href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html"title="enum core::result::Result">Result</a><U, <U as <aclass="trait"href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html"title="trait core::convert::TryFrom">TryFrom</a><T>>::<aclass="type"href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error"title="type core::convert::TryFrom::Error">Error</a>></code><aclass='srclink'href='https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#599-601'title='goto source code'>[src]</a></h4><divclass='docblock hidden'><p>Performs the conversion.</p>
