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The diagram toolbar gets an "Ajouter un arc" button next to the ellipse. Click one end, then click the other end at the height the arc should reach: the result is a half arc bulging up or down from the line between the two clicks (Shift: a true half circle). It is not filled, since a fill would close it into a half disc. A selected half arc shows one more handle, in the middle of the curve. Dragging it makes the arc deeper or flatter while both ends stay put; dragging it across the line between the ends turns the arc over. The handle is hidden whenever the arc is not a half arc on a horizontal or vertical diameter, because only then is "keep the ends, move the middle" one well-defined change. Nothing new is stored: an arc stays an Ellipse with a start and end angle, exactly as the existing arc handles of an ellipse save it, so files read by older versions are unchanged. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
68 lines
2.8 KiB
C++
68 lines
2.8 KiB
C++
/*
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Copyright 2006-2026 The QElectroTech Team
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This file is part of QElectroTech.
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QElectroTech is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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QElectroTech is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with QElectroTech. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef DIAGRAMEVENTADDSHAPE_H
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#define DIAGRAMEVENTADDSHAPE_H
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#include "../qetgraphicsitem/qetshapeitem.h"
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#include "diagrameventinterface.h"
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class QGraphicsEllipseItem;
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/**
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@brief The DiagramEventAddShape class
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This event manage the creation of a shape.
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*/
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class DiagramEventAddShape : public DiagramEventInterface
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{
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Q_OBJECT
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public:
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DiagramEventAddShape(Diagram *diagram, QetShapeItem::ShapeType shape_type, bool half_arc = false);
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~DiagramEventAddShape() override;
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void mousePressEvent (QGraphicsSceneMouseEvent *event) override;
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void mouseMoveEvent (QGraphicsSceneMouseEvent *event) override;
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void mouseReleaseEvent (QGraphicsSceneMouseEvent *event) override;
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void mouseDoubleClickEvent (QGraphicsSceneMouseEvent *event) override;
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void keyPressEvent (QKeyEvent *event) override;
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void keyReleaseEvent (QKeyEvent *event) override;
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void init() override;
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private:
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void updateHelpCross (const QPointF &p);
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void applyPosition (const QPointF &pos, Qt::KeyboardModifiers mods);
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void updateCreationHint () const;
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QString beforeClickHint () const;
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QString afterClickHint () const;
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void showCenterMarker (const QPointF &scenePos);
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void hideCenterMarker ();
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void reapplyLastPosition (QKeyEvent *event);
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protected:
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QetShapeItem::ShapeType m_shape_type;
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bool m_half_arc = false; // Ellipse only: draw a half arc whose chord is the first click's height (the Arc tool)
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QetShapeItem *m_shape_item;
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QGraphicsLineItem *m_help_horiz, *m_help_verti;
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QPointF m_anchor_point; // the shape's first-click point -- meaningful once m_shape_item exists
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QGraphicsEllipseItem *m_center_marker = nullptr; // shown only while Ctrl-anchoring is actually in effect, so it doubles as confirmation that it is
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bool m_center_anchored = false; // re-decided live on every applyPosition() call, from current Ctrl state
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QPointF m_last_mouse_scene_pos; // raw, unsnapped -- lets a modifier-only change re-snap correctly when reapplied
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};
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#endif // DIAGRAMEVENTADDSHAPE_H
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