63 lines
1.9 KiB
C
63 lines
1.9 KiB
C
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//
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// This source code is property of the Computer Graphics and Visualization
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// chair of the TU Dresden. Do not distribute in modified or unmodified form!
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// Copyright (C) 2016 CGV TU Dresden - All Rights Reserved
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//
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/*************************************************************************
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Canvas Renderer.
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This class is responsible for the graphical representation of a canvas
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store. Among the "render" method that performs the actual rendering on
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a grid a translation and zoom can be specified. Also this class provides
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a method to convert screen coordinates to grid coordinates and to
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snap screen coordinates to the next center of a pixel cell.
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*************************************************************************/
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#pragma once
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// declares the canvas_buffer
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#include "canvas_buffer.h"
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class canvas_renderer
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{
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public:
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// Initialize the renderer and store a reference of a canvas_buffer
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canvas_renderer(canvas_buffer &canvas);
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// Set the translation
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void set_translation(double x, double y);
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// Get the translation
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void get_translation(double &x, double &y) const;
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// Set the zoom factor
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void set_zoom(double factor);
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// Get the zoom factor
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double get_zoom() const;
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// Convert a screen position to a grid position
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void screen_to_grid(int sx, int sy, int &gx, int &gy) const;
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// Get the next cell center from the provided position
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void snap_screen_coords(int sx, int sy, int &scx, int &scy) const;
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// Render the contents of the canvas store
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void render() const;
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// Get the size of a cell in pixels
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double get_cell_size() const;
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// Reset translation and zoom factor
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void reset_view();
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private:
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// Translation
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double trans_x, trans_y;
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// Zoom factor
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double zoom_factor;
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// A reference on the canvas store
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canvas_buffer &canvas;
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// Helper method to render the grid
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void render_grid() const;
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};
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