ECG/exercise2/include/preview_renderer.h

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2019-05-11 08:51:24 +00:00
//
// This source code is property of the Computer Graphics and Visualization
// chair of the TU Dresden. Do not distribute in modified or unmodified form!
// Copyright (C) 2016 CGV TU Dresden - All Rights Reserved
//
/*************************************************************************
Helper class to render previews.
This class renders definable shapes. It is used to display the previews
for the drawing tools. It can be enabled/disabled and rendered using the
"render" method.
*************************************************************************/
#pragma once
// provides the declaration of the super class tool_base
#include "tool_base.h"
class preview_renderer
{
public:
// Initialize the preview renderer
preview_renderer();
// Enable rendering of previews
void enable_rendering();
// Disable rendering of previews
void disable_rendering();
// Set the start of a 2-point shape
void set_start(int x, int y);
// Set the destination of a 2-point shape
void set_dest(int x, int y);
// Set the shape
void set_shape(ToolShape shape);
// Render the preview
void render();
private:
// The actual shape id
ToolShape shape;
// Start and destination of the shape
int start_x, start_y, dest_x, dest_y;
// State indicating whether rendering is enabled
bool enabled;
};