71 lines
2.4 KiB
C
71 lines
2.4 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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The control points editor.
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This class provides a simple graphical editor for control points. It is
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constructed by passing a reference on a list of control points which is
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then changed according to mouse events. To recognize the events the user
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of an instance of this class has to call mouse_move when the mouse is
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moved and mouse_button when the mouse button states change. Because only
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a reference of the control points is used there is no method to return
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the control points as the original version which is in the hand of the
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user (of an object) is changed implicitly. To recognize whether a
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change occured the user can call "control_points_changed" which returns
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true in that case. To draw the control points a method called "draw"
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is implemented.
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**************************************************************************/
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#pragma once
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#include <vector>
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#include "tiny_vec.h"
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class control_points_editor
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{
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public:
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// Initialize members and use a reference of "control_points"
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// as point list to modify
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control_points_editor(std::vector<point2d> &control_points);
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// Act on mouse moves. This method shall be called whenever
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// the mouse was moved
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void mouse_move(int x, int y);
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// Act on mouse button events. This function shall be called
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// whenever a button is pressed. The parameters "button" and "state"
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// are to be filled with the corresponding GLUT states
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void mouse_button(int button, int state);
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// Return true when the control point list was changed.
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bool control_points_changed();
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// Draw the control points
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void draw_control_points();
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// Draw the control polygon
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void draw_control_polygon();
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private:
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// A reference on the control points
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std::vector<point2d> &control_points;
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// The last recognized mouse position
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int last_x, last_y;
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// The currently selected point for moving
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int selected_point;
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// A hovered point
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int hovered_point;
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// True if the list of points was changed
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bool points_changed;
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// Draw a circle using openGL
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void draw_circle(int x, int y, int r);
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// Find the point which is under the mouse
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int find_hovered_point();
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};
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