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86 lines
3.0 KiB
C++
86 lines
3.0 KiB
C++
/*
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* Canvas.h, part of VCMI engine
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*
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* Authors: listed in file AUTHORS in main folder
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*
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* License: GNU General Public License v2.0 or later
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* Full text of license available in license.txt file, in main folder
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*
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*/
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#pragma once
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#include "../gui/TextAlignment.h"
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#include "../../lib/Rect.h"
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#include "../../lib/Color.h"
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struct SDL_Color;
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struct SDL_Surface;
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class IImage;
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enum EFonts : int;
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/// Class that represents surface for drawing on
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class Canvas
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{
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/// Target surface
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SDL_Surface * surface;
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/// Current rendering area, all rendering operations will be moved into selected area
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Rect renderArea;
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public:
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Canvas & operator = (const Canvas & other) = delete;
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/// constructs canvas using existing surface. Caller maintains ownership on the surface
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explicit Canvas(SDL_Surface * surface);
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/// copy contructor
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Canvas(const Canvas & other);
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/// creates canvas that only covers specified subsection of a surface
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Canvas(const Canvas & other, const Rect & clipRect);
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/// constructs canvas of specified size
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explicit Canvas(const Point & size);
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~Canvas();
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/// if set to true, drawing this canvas onto another canvas will use alpha channel information
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void applyTransparency(bool on);
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/// applies grayscale filter onto current image
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void applyGrayscale();
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/// renders image onto this canvas at specified position
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void draw(const std::shared_ptr<IImage>& image, const Point & pos);
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/// renders section of image bounded by sourceRect at specified position
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void draw(const std::shared_ptr<IImage>& image, const Point & pos, const Rect & sourceRect);
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/// renders another canvas onto this canvas
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void draw(const Canvas &image, const Point & pos);
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/// renders another canvas onto this canvas with transparency
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void drawTransparent(const Canvas & image, const Point & pos, double transparency);
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/// renders another canvas onto this canvas with scaling
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void drawScaled(const Canvas &image, const Point & pos, const Point & targetSize);
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/// renders single pixels with specified color
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void drawPoint(const Point & dest, const ColorRGBA & color);
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/// renders continuous, 1-pixel wide line with color gradient
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void drawLine(const Point & from, const Point & dest, const ColorRGBA & colorFrom, const ColorRGBA & colorDest);
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/// renders dashed, 1-pixel wide line with specified color
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void drawLineDashed(const Point & from, const Point & dest, const ColorRGBA & color);
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/// renders rectangular, dashed border in specified location
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void drawBorderDashed(const Rect & target, const ColorRGBA & color);
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/// renders single line of text with specified parameters
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void drawText(const Point & position, const EFonts & font, const SDL_Color & colorDest, ETextAlignment alignment, const std::string & text );
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/// renders multiple lines of text with specified parameters
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void drawText(const Point & position, const EFonts & font, const SDL_Color & colorDest, ETextAlignment alignment, const std::vector<std::string> & text );
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};
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