7ce7b88a40
- Adaptive point filtering - zoom-based minimum distance (3px / zoom) prevents point overflow during fast movements. - Speed-based pressure simulation - exponential smoothing (decay 0.95) creates variable line thickness: pressure = clamp(1.0 - speed * 0.1). - Two-pass weighted averaging - smoothed = current * 0.5 + neighbors * 0.25 eliminates jagged lines while preserving initial direction. - Incremental rendering with 3-point overlap - draws only new segments, reduces complexity from O(n^2) to O(n). - QPainterPath with quadratic Bezier curves - single fillPath() call instead of multiple drawEllipse().
97 lines
2.1 KiB
C++
97 lines
2.1 KiB
C++
/*
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This file is part of Telegram Desktop,
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the official desktop application for the Telegram messaging service.
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For license and copyright information please follow this link:
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https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
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*/
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#pragma once
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#include "ui/painter.h"
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#include <QGraphicsItem>
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class QGraphicsSceneMouseEvent;
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namespace Editor {
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class ItemCanvas : public QGraphicsItem {
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public:
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struct Content {
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QPixmap pixmap;
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QPointF position;
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};
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ItemCanvas();
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~ItemCanvas();
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void applyBrush(const QColor &color, float size);
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void clearPixmap();
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void cancelDrawing();
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void updateZoom(float64 zoom);
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QRectF boundingRect() const override;
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void paint(
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QPainter *p,
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const QStyleOptionGraphicsItem *option,
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QWidget *widget) override;
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void handleMousePressEvent(not_null<QGraphicsSceneMouseEvent*> event);
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void handleMouseReleaseEvent(not_null<QGraphicsSceneMouseEvent*> event);
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void handleMouseMoveEvent(not_null<QGraphicsSceneMouseEvent*> event);
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[[nodiscard]] rpl::producer<Content> grabContentRequests() const;
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protected:
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bool collidesWithItem(
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const QGraphicsItem *,
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Qt::ItemSelectionMode) const override;
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bool collidesWithPath(
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const QPainterPath &,
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Qt::ItemSelectionMode) const override;
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private:
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struct StrokePoint {
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QPointF pos;
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float64 pressure = 1.0;
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int64 time = 0;
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};
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void computeContentRect(const QPointF &p);
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void addStrokePoint(const QPointF &point, int64 time);
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void drawIncrementalStroke();
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std::vector<StrokePoint> smoothStroke(
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const std::vector<StrokePoint> &points) const;
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void renderSegment(
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const std::vector<StrokePoint> &points,
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int startIdx);
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bool _drawing = false;
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std::vector<StrokePoint> _currentStroke;
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int _lastRenderedIndex = 0;
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float64 _zoom = 1.0;
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int64 _lastPointTime = 0;
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std::unique_ptr<PainterHighQualityEnabler> _hq;
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std::unique_ptr<Painter> _p;
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QRectF _rectToUpdate;
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QRectF _contentRect;
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QMarginsF _brushMargins;
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QPointF _lastPoint;
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QPixmap _pixmap;
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QPainterPath _currentPath;
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struct {
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float size = 1.;
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QColor color;
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} _brushData;
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rpl::event_stream<Content> _grabContentRequests;
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};
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} // namespace Editor
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