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fix skew

This commit is contained in:
Skyler Lehmkuhl 2025-11-19 11:47:19 -05:00
parent 9cbfefca1d
commit 1cb2aabc9c
1 changed files with 46 additions and 29 deletions
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77
lightningbeam-ui/lightningbeam-editor/src/panes/stage.rs
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@ -2259,7 +2259,8 @@ impl StagePane {
}
TransformMode::Skew { axis, origin } => {
// Calculate skew angle such that the edge follows the mouse cursor
// Calculate skew angle for center-relative skewing (center stays fixed)
let center = original_bbox.center();
let skew_radians = match axis {
Axis::Horizontal => {
// Determine which horizontal edge we're dragging
@ -2268,10 +2269,10 @@ impl StagePane {
} else {
original_bbox.y0 // Origin is bottom edge, so dragging top
};
let distance = edge_y - origin.y;
let distance = edge_y - center.y; // Distance from center to edge
if distance.abs() > 0.1 {
// tan(skew) = horizontal_offset / vertical_distance
let tan_skew = (current_mouse.x - origin.x) / distance;
// tan(skew) = mouse_movement / distance_from_center
let tan_skew = (current_mouse.x - start_mouse.x) / distance;
tan_skew.atan()
} else {
0.0
@ -2284,10 +2285,10 @@ impl StagePane {
} else {
original_bbox.x0 // Origin is right edge, so dragging left
};
let distance = edge_x - origin.x;
let distance = edge_x - center.x; // Distance from center to edge
if distance.abs() > 0.1 {
// tan(skew) = vertical_offset / horizontal_distance
let tan_skew = (current_mouse.y - origin.y) / distance;
// tan(skew) = mouse_movement / distance_from_center
let tan_skew = (current_mouse.y - start_mouse.y) / distance;
tan_skew.atan()
} else {
0.0
@ -2296,42 +2297,58 @@ impl StagePane {
};
let skew_degrees = skew_radians.to_degrees();
// Calculate selection center for group skew
// Calculate selection center for group skew - this stays fixed
let selection_center = match axis {
Axis::Horizontal => {
// For horizontal skew, use center Y
original_bbox.center().y
}
Axis::Vertical => {
// For vertical skew, use center X
original_bbox.center().x
}
Axis::Horizontal => original_bbox.center().y,
Axis::Vertical => original_bbox.center().x,
};
// Apply skew to all selected objects
let tan_skew = skew_degrees.to_radians().tan();
// Note: skew_radians = atan(tan_skew), so tan(skew_radians) = tan_skew
let tan_skew = skew_radians.tan();
for (object_id, original_transform) in original_transforms {
vector_layer.modify_object_internal(object_id, |obj| {
// Calculate distance from selection center
let distance_from_center = match axis {
Axis::Horizontal => {
// For horizontal skew, measure Y distance
original_transform.y - selection_center
}
Axis::Vertical => {
// For vertical skew, measure X distance
original_transform.x - selection_center
// Get the object to find its shape
let object = vector_layer.get_object(object_id);
// Calculate the world-space center where the renderer applies skew
// This is the shape's bounding box center transformed to world space
let shape_center_world = if let Some(obj) = object {
if let Some(shape) = vector_layer.get_shape(&obj.shape_id) {
use kurbo::Shape as KurboShape;
let shape_bbox = shape.path().bounding_box();
let local_center_x = (shape_bbox.x0 + shape_bbox.x1) / 2.0;
let local_center_y = (shape_bbox.y0 + shape_bbox.y1) / 2.0;
// Transform to world space (same as renderer)
let world_center = kurbo::Affine::translate((original_transform.x, original_transform.y))
* kurbo::Affine::rotate(original_transform.rotation.to_radians())
* kurbo::Affine::scale_non_uniform(original_transform.scale_x, original_transform.scale_y)
* kurbo::Point::new(local_center_x, local_center_y);
(world_center.x, world_center.y)
} else {
// Fallback to object position if shape not found
(original_transform.x, original_transform.y)
}
} else {
// Fallback to object position if object not found
(original_transform.x, original_transform.y)
};
// Calculate translation to make group skew cohesive
vector_layer.modify_object_internal(object_id, |obj| {
// Distance from selection center using the object's actual skew center
let distance_from_center = match axis {
Axis::Horizontal => shape_center_world.1 - selection_center,
Axis::Vertical => shape_center_world.0 - selection_center,
};
// Calculate translation to make group skew around center
let (offset_x, offset_y) = match axis {
Axis::Horizontal => {
// Horizontal skew: translate X based on Y distance
// Horizontal skew: objects above/below center move horizontally
(distance_from_center * tan_skew, 0.0)
}
Axis::Vertical => {
// Vertical skew: translate Y based on X distance
// Vertical skew: objects left/right of center move vertically
(0.0, distance_from_center * tan_skew)
}
};