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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
//! Utilities to deal with coordinate spaces.
use std::fmt;
use euclid::{Transform3D, Rect, Point2D, Vector2D};
use api::units::*;
use crate::spatial_tree::{SpatialTree, CoordinateSpaceMapping, SpatialNodeIndex, VisibleFace};
use crate::util::project_rect;
use crate::util::{MatrixHelpers, ScaleOffset, RectHelpers, PointHelpers};
#[derive(Debug, Clone)]
pub struct SpaceMapper<F, T> {
kind: CoordinateSpaceMapping<F, T>,
pub ref_spatial_node_index: SpatialNodeIndex,
pub current_target_spatial_node_index: SpatialNodeIndex,
pub bounds: Rect<f32, T>,
visible_face: VisibleFace,
}
impl<F, T> SpaceMapper<F, T> where F: fmt::Debug {
pub fn new(
ref_spatial_node_index: SpatialNodeIndex,
bounds: Rect<f32, T>,
) -> Self {
SpaceMapper {
kind: CoordinateSpaceMapping::Local,
ref_spatial_node_index,
current_target_spatial_node_index: ref_spatial_node_index,
bounds,
visible_face: VisibleFace::Front,
}
}
pub fn new_with_target(
ref_spatial_node_index: SpatialNodeIndex,
target_node_index: SpatialNodeIndex,
bounds: Rect<f32, T>,
spatial_tree: &SpatialTree,
) -> Self {
let mut mapper = Self::new(ref_spatial_node_index, bounds);
mapper.set_target_spatial_node(target_node_index, spatial_tree);
mapper
}
pub fn set_target_spatial_node(
&mut self,
target_node_index: SpatialNodeIndex,
spatial_tree: &SpatialTree,
) {
if target_node_index == self.current_target_spatial_node_index {
return
}
let ref_spatial_node = &spatial_tree.spatial_nodes[self.ref_spatial_node_index.0 as usize];
let target_spatial_node = &spatial_tree.spatial_nodes[target_node_index.0 as usize];
self.visible_face = VisibleFace::Front;
self.kind = if self.ref_spatial_node_index == target_node_index {
CoordinateSpaceMapping::Local
} else if ref_spatial_node.coordinate_system_id == target_spatial_node.coordinate_system_id {
let scale_offset = ref_spatial_node.content_transform
.inverse()
.accumulate(&target_spatial_node.content_transform);
CoordinateSpaceMapping::ScaleOffset(scale_offset)
} else {
let transform = spatial_tree
.get_relative_transform_with_face(
target_node_index,
self.ref_spatial_node_index,
Some(&mut self.visible_face),
)
.into_transform()
.with_source::<F>()
.with_destination::<T>();
CoordinateSpaceMapping::Transform(transform)
};
self.current_target_spatial_node_index = target_node_index;
}
pub fn get_transform(&self) -> Transform3D<f32, F, T> {
match self.kind {
CoordinateSpaceMapping::Local => {
Transform3D::identity()
}
CoordinateSpaceMapping::ScaleOffset(ref scale_offset) => {
scale_offset.to_transform()
}
CoordinateSpaceMapping::Transform(transform) => {
transform
}
}
}
pub fn unmap(&self, rect: &Rect<f32, T>) -> Option<Rect<f32, F>> {
match self.kind {
CoordinateSpaceMapping::Local => {
Some(rect.cast_unit())
}
CoordinateSpaceMapping::ScaleOffset(ref scale_offset) => {
Some(scale_offset.unmap_rect(rect))
}
CoordinateSpaceMapping::Transform(ref transform) => {
transform.inverse_rect_footprint(rect)
}
}
}
pub fn map(&self, rect: &Rect<f32, F>) -> Option<Rect<f32, T>> {
match self.kind {
CoordinateSpaceMapping::Local => {
Some(rect.cast_unit())
}
CoordinateSpaceMapping::ScaleOffset(ref scale_offset) => {
Some(scale_offset.map_rect(rect))
}
CoordinateSpaceMapping::Transform(ref transform) => {
match project_rect(transform, rect, &self.bounds) {
Some(bounds) => {
Some(bounds)
}
None => {
warn!("parent relative transform can't transform the primitive rect for {:?}", rect);
None
}
}
}
}
}
// Attempt to return a rect that is contained in the mapped rect.
pub fn map_inner_bounds(&self, rect: &Rect<f32, F>) -> Option<Rect<f32, T>> {
match self.kind {
CoordinateSpaceMapping::Local => {
Some(rect.cast_unit())
}
CoordinateSpaceMapping::ScaleOffset(ref scale_offset) => {
Some(scale_offset.map_rect(rect))
}
CoordinateSpaceMapping::Transform(..) => {
// We could figure out a rect that is contained in the transformed rect but
// for now we do the simple thing here and bail out.
return None;
}
}
}
pub fn map_vector(&self, v: Vector2D<f32, F>) -> Vector2D<f32, T> {
match self.kind {
CoordinateSpaceMapping::Local => {
v.cast_unit()
}
CoordinateSpaceMapping::ScaleOffset(ref scale_offset) => {
scale_offset.map_vector(&v)
}
CoordinateSpaceMapping::Transform(ref transform) => {
transform.transform_vector2d(v)
}
}
}
}
#[derive(Clone, Debug)]
pub struct SpaceSnapper {
pub ref_spatial_node_index: SpatialNodeIndex,
current_target_spatial_node_index: SpatialNodeIndex,
snapping_transform: Option<ScaleOffset>,
pub device_pixel_scale: DevicePixelScale,
}
impl SpaceSnapper {
pub fn new(
ref_spatial_node_index: SpatialNodeIndex,
device_pixel_scale: DevicePixelScale,
) -> Self {
SpaceSnapper {
ref_spatial_node_index,
current_target_spatial_node_index: SpatialNodeIndex::INVALID,
snapping_transform: None,
device_pixel_scale,
}
}
pub fn new_with_target(
ref_spatial_node_index: SpatialNodeIndex,
target_node_index: SpatialNodeIndex,
device_pixel_scale: DevicePixelScale,
spatial_tree: &SpatialTree,
) -> Self {
let mut snapper = SpaceSnapper {
ref_spatial_node_index,
current_target_spatial_node_index: SpatialNodeIndex::INVALID,
snapping_transform: None,
device_pixel_scale,
};
snapper.set_target_spatial_node(target_node_index, spatial_tree);
snapper
}
pub fn set_target_spatial_node(
&mut self,
target_node_index: SpatialNodeIndex,
spatial_tree: &SpatialTree,
) {
if target_node_index == self.current_target_spatial_node_index {
return
}
let ref_spatial_node = &spatial_tree.spatial_nodes[self.ref_spatial_node_index.0 as usize];
let target_spatial_node = &spatial_tree.spatial_nodes[target_node_index.0 as usize];
self.current_target_spatial_node_index = target_node_index;
self.snapping_transform = match (ref_spatial_node.snapping_transform, target_spatial_node.snapping_transform) {
(Some(ref ref_scale_offset), Some(ref target_scale_offset)) => {
Some(ref_scale_offset
.inverse()
.accumulate(target_scale_offset)
.scale(self.device_pixel_scale.0))
}
_ => None,
};
}
pub fn snap_rect<F>(&self, rect: &Rect<f32, F>) -> Rect<f32, F> where F: fmt::Debug {
debug_assert!(self.current_target_spatial_node_index != SpatialNodeIndex::INVALID);
match self.snapping_transform {
Some(ref scale_offset) => {
let snapped_device_rect : DeviceRect = scale_offset.map_rect(rect).snap();
scale_offset.unmap_rect(&snapped_device_rect)
}
None => *rect,
}
}
pub fn snap_point<F>(&self, point: &Point2D<f32, F>) -> Point2D<f32, F> where F: fmt::Debug {
debug_assert!(self.current_target_spatial_node_index != SpatialNodeIndex::INVALID);
match self.snapping_transform {
Some(ref scale_offset) => {
let snapped_device_vector : DevicePoint = scale_offset.map_point(point).snap();
scale_offset.unmap_point(&snapped_device_vector)
}
None => *point,
}
}
}
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