74 lines
1.9 KiB
Rust
74 lines
1.9 KiB
Rust
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use crate::*;
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/// Linearly transforms positions from one [`Rect`] to another.
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///
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/// `RectTransform` stores the rectangles, and therefore supports clamping and culling.
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#[derive(Clone, Copy, Debug, PartialEq)]
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pub struct RectTransform {
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from: Rect,
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to: Rect,
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}
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impl RectTransform {
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pub fn identity(from_and_to: Rect) -> Self {
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Self::from_to(from_and_to, from_and_to)
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}
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pub fn from_to(from: Rect, to: Rect) -> Self {
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Self { from, to }
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}
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pub fn from(&self) -> &Rect {
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&self.from
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}
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pub fn to(&self) -> &Rect {
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&self.to
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}
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pub fn inverse(&self) -> RectTransform {
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Self::from_to(self.to, self.from)
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}
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/// Transforms the given coordinate in the `from` space to the `to` space.
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pub fn transform_pos(&self, pos: Pos2) -> Pos2 {
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pos2(
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remap(pos.x, self.from.x_range(), self.to.x_range()),
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remap(pos.y, self.from.y_range(), self.to.y_range()),
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)
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}
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/// Transforms the given rectangle in the `in`-space to a rectangle in the `out`-space.
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pub fn transform_rect(&self, rect: Rect) -> Rect {
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Rect {
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min: self.transform_pos(rect.min),
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max: self.transform_pos(rect.max),
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}
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}
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/// Transforms the given coordinate in the `from` space to the `to` space,
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/// clamping if necessary.
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pub fn transform_pos_clamped(&self, pos: Pos2) -> Pos2 {
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pos2(
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remap_clamp(pos.x, self.from.x_range(), self.to.x_range()),
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remap_clamp(pos.y, self.from.y_range(), self.to.y_range()),
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)
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}
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}
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/// Transforms the position.
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impl std::ops::Mul<Pos2> for RectTransform {
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type Output = Pos2;
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fn mul(self, pos: Pos2) -> Pos2 {
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self.transform_pos(pos)
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}
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}
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/// Transforms the position.
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impl std::ops::Mul<Pos2> for &RectTransform {
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type Output = Pos2;
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fn mul(self, pos: Pos2) -> Pos2 {
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self.transform_pos(pos)
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}
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}
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