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310 lines
9.9 KiB
C++
310 lines
9.9 KiB
C++
/***************************************************************************
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* Copyright (C) gempa GmbH *
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* All rights reserved. *
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* Contact: gempa GmbH (seiscomp-dev@gempa.de) *
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* *
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* GNU Affero General Public License Usage *
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* This file may be used under the terms of the GNU Affero *
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* Public License version 3.0 as published by the Free Software Foundation *
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* and appearing in the file LICENSE included in the packaging of this *
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* file. Please review the following information to ensure the GNU Affero *
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* Public License version 3.0 requirements will be met: *
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* https://www.gnu.org/licenses/agpl-3.0.html. *
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* *
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* Other Usage *
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* Alternatively, this file may be used in accordance with the terms and *
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* conditions contained in a signed written agreement between you and *
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* gempa GmbH. *
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***************************************************************************/
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#ifndef SEISCOMP_GUI_MAP_PROJECTION_H
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#define SEISCOMP_GUI_MAP_PROJECTION_H
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#include <seiscomp/core/interfacefactory.h>
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#include <seiscomp/geo/boundingbox.h>
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#include <seiscomp/gui/map/texturecache.h>
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#include <seiscomp/gui/qt.h>
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#include <QPainterPath>
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#include <QImage>
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namespace Seiscomp {
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namespace Gui {
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namespace Map {
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/**
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* @brief The CompositionMode enum define composition modes when
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* drawing an image.
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*/
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enum CompositionMode {
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CompositionMode_Default, // Either Source or SourceOver depending on image format.
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CompositionMode_Source, // Image pixels replace map pixels.
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CompositionMode_SourceOver, // Image pixels are blended with map according
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// to the image pixels alpha value.
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CompositionMode_Xor, // Colors are bitwise xor'd
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CompositionMode_Plus, // Colors are added together
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CompositionMode_Multiply // Image pixels are multiplied with map pixels, alpha
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// is ignored.
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};
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/**
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* @brief The FilterMode enum define filter modes when drawing images and
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* map tiles.
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*/
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enum FilterMode {
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FilterMode_Auto, // Let the canvas decide how to filter the image
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FilterMode_Nearest, // The nearest image pixel for a subpixel is used
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FilterMode_Bilinear // The four neighbor pixels are interpolated for a subpixel
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};
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enum ClipHint {
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NoClip, // Clipping not necessary, bounding box is completely contained
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DoClip // Clipping would help to reduce render time
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};
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// All QPointF instances are geographical coordinates where
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// x = longitude and y = latitude.
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class SC_GUI_API Projection {
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// ----------------------------------------------------------------------
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// X'struction
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// ----------------------------------------------------------------------
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public:
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Projection();
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virtual ~Projection();
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// ----------------------------------------------------------------------
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// Public interface
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// ----------------------------------------------------------------------
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public:
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void setBackgroundColor(const QColor &c);
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void setZoom(qreal zoom);
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qreal zoom() const;
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qreal visibleZoom() const;
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qreal pixelPerDegree() const;
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virtual QPointF gridDistance() const;
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void setView(const QPointF &geoCoords, qreal zoom);
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QPointF center() const;
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QPointF visibleCenter() const;
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void draw(QImage &buffer, bool filter, TextureCache *cache);
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virtual bool isRectangular() const = 0;
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virtual bool wantsGridAntialiasing() const = 0;
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/**
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* @brief Updates the visible map bounding box. This function will be
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* called *after* rendering, so after calling
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* @render(QImage &, bool, TextureCache *).
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*/
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virtual void updateBoundingBox();
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/**
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* @brief Returns the current visible map bounding box. Note that this
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* bounding box will only be valid after the projection has
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* been rendered otherwise it will be in an undefined state.
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* @return The bounding box currently visible.
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*/
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const Geo::GeoBoundingBox &boundingBox() const;
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virtual bool project(QPoint &screenCoords, const QPointF &geoCoords) const = 0;
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virtual bool unproject(QPointF &geoCoords, const QPoint &screenCoords) const = 0;
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virtual void centerOn(const QPointF &geoCoords) = 0;
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virtual void displayRect(const QRectF& rect);
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virtual void drawImage(QImage &buffer, const QRectF &geoReference, const QImage &image, bool highQuality,
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CompositionMode compositionMode = CompositionMode_Default);
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//! Returns the number of interpolation steps when drawing a
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//! geometric line.
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virtual int lineSteps(const QPointF &p0, const QPointF &p1);
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//! Draws a straight line. Returns false, when the whole line has been clipped
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//! completely otherwise true.
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virtual bool drawLine(QPainter &p, const QPointF &from, const QPointF &to);
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virtual void moveTo(const QPointF &p);
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virtual bool lineTo(QPainter &p, const QPointF &to);
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virtual bool drawLatCircle(QPainter &p, qreal lon);
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virtual bool drawLonCircle(QPainter &p, qreal lat);
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/**
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* Returns true if the GUI object, represented by its bounding box in geo
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* coordinates, does not intersect the canvas. Note: The default
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* implementation checks clipping against the map bounding box which is
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* perfectly OK in all situations given the bounding box is computed
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* correctly. If more complex checks needs to be implemented, then
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* override this method. The default implementation just calls
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* @isClipped(const Geo::GeoBoundingBox &).
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*
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* Warning: This method is deprecated. In future this virtual method
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* will be removed and the only clipping check will be against the map
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* bounding box. There is no need to delegate clipping to custom
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* projections as long as a correct bounding box is maintained.
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*/
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virtual bool isClipped(const QPointF &bboxLR, const QPointF &bboxUL) const;
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bool isClipped(const Geo::GeoBoundingBox &bbox) const;
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/**
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* @brief Projects a closed input geo polygon to a QPainterPath
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* @param screenPath The painter path in screen coordinates. That
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* path must represent the input polygon on screen.
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* @param n The number of input coordinates
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* @param poly The coordinates of the polygon. The polygon is assumed
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* to be closed.
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* @param minPixelDist The minimum pixel distance two coordinates must
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* have to become two separate projections on screen.
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* If their distance is less then the coordinates
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* will collapse into a single pixel.
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* @return A flag that defines wether the returned path is valid.
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*/
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virtual bool project(QPainterPath &screenPath, size_t n,
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const Geo::GeoCoordinate *poly, bool closed,
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uint minPixelDist, ClipHint hint = NoClip) const;
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/**
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*@brief Sets the number of grid lines for the largest screen dimension.
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* The specified number is used in the grid distance calculation,
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* @see gridDistance()
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*@since API Version 12.0.0
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*/
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void setGridLines(qreal numLines);
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protected:
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void setSize(int width, int height);
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void setVisibleRadius(qreal r);
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virtual void render(QImage &img, bool highQuality, TextureCache *cache) = 0;
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// ----------------------------------------------------------------------
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// Protected member
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// ----------------------------------------------------------------------
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protected:
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qreal _radius;
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qreal _visibleRadius;
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qreal _pixelPerDegreeFact;
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int _width;
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int _height;
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int _halfWidth;
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int _halfHeight;
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qreal _screenRadius;
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qreal _mapWidth;
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qreal _halfMapWidth;
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qreal _scale;
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qreal _oneOverScale;
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QPointF _center;
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QPointF _visibleCenter;
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QPoint _cursor;
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bool _cursorVisible;
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QRgb _background;
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qreal _gridLines;
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Geo::GeoBoundingBox _mapBoundingBox;
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};
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DEFINE_INTERFACE_FACTORY(Projection);
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inline const Geo::GeoBoundingBox &Projection::boundingBox() const {
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return _mapBoundingBox;
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}
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#define REGISTER_PROJECTION_INTERFACE(Class, Service) \
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Seiscomp::Core::Generic::InterfaceFactory<Seiscomp::Gui::Map::Projection, Class> __##Class##InterfaceFactory__(Service)
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struct NearestFilter {
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static void fetch(TextureCache *cache, QRgb &c, Coord u, Coord v, int level) {
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cache->getTexel(c,u,v,level);
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}
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};
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struct BilinearFilter {
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static void fetch(TextureCache *cache, QRgb &c, Coord u, Coord v, int level) {
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cache->getTexelBilinear(c,u,v,level);
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}
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};
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struct CompositionSourceOver {
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static void combine(QRgb &target, QRgb source) {
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int alpha = qAlpha(source);
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int iAlpha = 255 - alpha;
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target = qRgb(
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(qRed(source)*alpha + qRed(target)*iAlpha) >> 8,
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(qGreen(source)*alpha + qGreen(target)*iAlpha) >> 8,
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(qBlue(source)*alpha + qBlue(target)*iAlpha) >> 8
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);
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}
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};
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struct CompositionSource {
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static void combine(QRgb &target, QRgb source) {
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target = source;
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}
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};
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struct CompositionMultiply {
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static void combine(QRgb &target, QRgb source) {
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target = qRgb(
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(qRed(source) * qRed(target)) >> 8,
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(qGreen(source) * qGreen(target)) >> 8,
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(qBlue(source) * qBlue(target)) >> 8
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);
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}
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};
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struct CompositionXor {
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static void combine(QRgb &target, QRgb source) {
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target = qRgb(
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(qRed(source) xor qRed(target)),
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(qGreen(source) xor qGreen(target)),
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(qBlue(source) xor qBlue(target))
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);
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}
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};
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struct CompositionPlus {
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static void combine(QRgb &target, QRgb source) {
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int r = qRed(source) + qRed(target);
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int g = qGreen(source) + qGreen(target);
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int b = qBlue(source) + qBlue(target);
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target = qRgb(r > 255 ? 255 : r, g > 255 ? 255 : g, b > 255 ? 255 : b);
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}
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};
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}
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}
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}
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#endif
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