67 lines
2.1 KiB
C
67 lines
2.1 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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Abstract tool.
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This class provides the basic superclass for all tools (pen, lines, circle...)
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The constructor of the class takes a reference of a canvas_buffer as parameter
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on which the pixels are changed.
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The user of an instance of a derived class can use two different draw methods:
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One version that operates only with the information of a single position
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(e.g. the pen or the fill tools) and one that needs two pixel positions
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(e.g. the line, circle or box). Also every tool maintains an element of
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the enumerations of possible shapes (which are used for the preview tool).
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For debugging purpose a method "set_text" is provided which modifies a
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text stream that will be displayed in the main window.
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*************************************************************************/
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#pragma once
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// needed for the set_text method
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#include <sstream>
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// declares the canvas_buffer
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#include "canvas_buffer.h"
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// Enumeration of possible shapes
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enum ToolShape
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{
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TS_LINE, // a line
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TS_BOX, // a box
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TS_CIRCLE, // a circle
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TS_NONE // no shape
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};
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class tool_base
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{
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public:
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// Initialize the tool and store a reference of a canvas_buffer
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tool_base(canvas_buffer &canvas);
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// Draw with one point provided
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virtual void draw(int x, int y);
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// Draw with two points provided
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virtual void draw(int x0, int y0, int x1, int y1);
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// Get the shape that this tool will draw
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const ToolShape get_shape() const;
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// Put a text into the stream "stream" which will be displayed
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// in the main window
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virtual void set_text(std::stringstream& stream);
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// Return true if draw(x, y) is valid during dragging operations
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const bool is_tool_draggable() const;
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protected:
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// The shape which is initialized in the constructor
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ToolShape shape;
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// A reference of the canvas store
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canvas_buffer &canvas;
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bool is_draggable;
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};
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