SelectionTransformHandles.h File Reference

#include <array>
#include <span>
#include "donner/base/Box.h"
#include "donner/base/Transform.h"
#include "donner/base/Vector2.h"

Include dependency graph for SelectionTransformHandles.h:

This graph shows which files directly or indirectly include this file:

Classes
struct	donner::editor::SelectionTransformHandleIntent
	Hit-test result for selection transform handles. More...
struct	donner::editor::SelectionTransformHandleBoxes
	Visual handle boxes for one selection envelope, in document coordinates. More...

Namespaces
namespace	donner
	Top-level Donner namespace, which is split into different sub-namespaces such as donner::svg and donner::css.

Enumerations
enum class	donner::editor::SelectionTransformCorner {   TopLeft ,   TopRight ,   BottomRight ,   BottomLeft }
	Corner handle identity for selection resize/rotate gestures.
enum class	donner::editor::SelectionTransformHandleKind {   None ,   Resize ,   Rotate }
	Interaction kind under the pointer near selection transform handles.

Functions
Box2d	donner::editor::CombinedSelectionBounds (std::span< const Box2d > selectionBoundsDoc)
	Return a combined AABB for a selection-bounds span.
Vector2d	donner::editor::SelectionTransformCornerPoint (const Box2d &bounds, SelectionTransformCorner corner)
	Return the point for a corner of bounds.
SelectionTransformCorner	donner::editor::OppositeSelectionTransformCorner (SelectionTransformCorner corner)
	Return the opposite corner from corner.
SelectionTransformHandleBoxes	donner::editor::SelectionTransformHandleBoxesForBounds (const Box2d &boundsDoc, double pixelsPerDocUnit)
	Build document-space handle boxes with screen-stable size under pixelsPerDocUnit.
SelectionTransformHandleIntent	donner::editor::HitTestSelectionTransformHandles (std::span< const Box2d > selectionBoundsDoc, const Vector2d &documentPoint, double pixelsPerDocUnit, bool includeRotate=true)
	Hit-test resize and rotate corner zones using document-space bounds and scale.
double	donner::editor::PixelsPerDocUnitFromTransform (const Transform2d &canvasFromDoc)
	Return pixels per document unit from a document-to-canvas transform.
Transform2d	donner::editor::TransformDocumentAroundPoint (const Vector2d &fixedDocumentPoint, const Transform2d &centeredDocumentFromDocument)
	Compose centeredDocumentFromDocument so it acts around fixedDocumentPoint instead of the document origin: translate the fixed point to the origin, apply the transform, translate back. Shared by the select tool's resize/rotate gestures and the text tool's frame rotate.
double	donner::editor::AngleFromCenter (const Vector2d &center, const Vector2d &point)
	Angle of point around center in radians, measured from +x.

Function Documentation

HitTestSelectionTransformHandles()

SelectionTransformHandleIntent donner::editor::HitTestSelectionTransformHandles ( std::span< const Box2d > selectionBoundsDoc, const Vector2d & documentPoint, double pixelsPerDocUnit, bool includeRotate = true )

nodiscard

Hit-test resize and rotate corner zones using document-space bounds and scale.

Resize wins over rotate when zones overlap. Rotate is intentionally outside the square handle, in a small ring around each corner.

Parameters

selectionBoundsDoc	Selection bounds in document coordinates.
documentPoint	Point to hit test in document coordinates.
pixelsPerDocUnit	Current viewport scale.
includeRotate	Whether rotate ring zones should be considered.