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View2d

neco_view2d

Struct View2d 

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pub struct View2d {
    pub center_x: f64,
    pub center_y: f64,
    pub view_size: f64,
}
Expand description

2D view transform (pan & zoom).

view_size is the world-space height mapped to the canvas vertical extent. Smaller values mean more zoom.

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§center_x: f64§center_y: f64§view_size: f64

World-space height visible on canvas. Always positive.

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impl View2d

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pub fn set(&mut self, center_x: f64, center_y: f64, view_size: f64)

Set view parameters. view_size is clamped to positive.

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pub fn pan(&mut self, dx: f64, dy: f64, canvas_height: f64)

Pan by pixel delta. Speed scales with view_size / canvas_height.

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pub fn zoom_at( &mut self, delta: f64, canvas_x: f64, canvas_y: f64, canvas_width: f64, canvas_height: f64, )

Zoom centered on a canvas position. delta > 0 zooms in.

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pub fn canvas_to_world( &self, cx: f64, cy: f64, canvas_width: f64, canvas_height: f64, ) -> (f64, f64)

Convert canvas coordinates to world coordinates.

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pub fn world_to_canvas( &self, wx: f64, wy: f64, canvas_width: f64, canvas_height: f64, ) -> (f64, f64)

Convert world coordinates to canvas coordinates.

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pub fn fit( &mut self, world_width: f64, world_height: f64, canvas_width: f64, canvas_height: f64, )

Fit the entire world region into the canvas.

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pub fn zoom_factor(&self, reference_view_size: f64) -> f64

Current zoom factor relative to a reference view_size.

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impl Clone for View2d

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fn clone(&self) -> View2d

Returns a duplicate of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for View2d

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl Default for View2d

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fn default() -> Self

Returns the “default value” for a type. Read more

Auto Trait Implementations§

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dest. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.