dagon.graphics.freeview source code

1 /*
2 Copyright (c) 2017-2018 Timur Gafarov
3 
4 Boost Software License - Version 1.0 - August 17th, 2003
5 Permission is hereby granted, free of charge, to any person or organization
6 obtaining a copy of the software and accompanying documentation covered by
7 this license (the "Software") to use, reproduce, display, distribute,
8 execute, and transmit the Software, and to prepare derivative works of the
9 Software, and to permit third-parties to whom the Software is furnished to
10 do so, all subject to the following:
11 
12 The copyright notices in the Software and this entire statement, including
13 the above license grant, this restriction and the following disclaimer,
14 must be included in all copies of the Software, in whole or in part, and
15 all derivative works of the Software, unless such copies or derivative
16 works are solely in the form of machine-executable object code generated by
17 a source language processor.
18 
19 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
22 SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
23 FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
24 ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
25 DEALINGS IN THE SOFTWARE.
26 */
27 
28 module dagon.graphics.freeview;
29 
30 import dlib.core.memory;
31 import dlib.math.vector;
32 import dlib.math.matrix;
33 import dlib.math.quaternion;
34 
35 import dagon.core.libs;
36 import dagon.core.ownership;
37 import dagon.core.event;
38 import dagon.core.keycodes;
39 import dagon.graphics.tbcamera;
40 import dagon.graphics.view;
41 
42 class Freeview: EventListener, View
43 {
44     TrackballCamera camera;
45     int prevMouseX;
46     int prevMouseY;
47 
48     this(EventManager emngr, Owner owner)
49     {
50         super(emngr, owner);
51         camera = New!TrackballCamera();
52         camera.pitch(45.0f);
53         camera.turn(45.0f);
54         camera.setZoom(20.0f);
55     }
56 
57     void reset()
58     {
59         camera.reset();
60         camera.pitch(45.0f);
61         camera.turn(45.0f);
62         camera.setZoom(20.0f);
63         camera.update(1.0 / 60.0);
64     }
65 
66     ~this()
67     {
68         Delete(camera);
69     }
70 
71     override void onMouseButtonDown(int button)
72     {
73         if (button == MB_LEFT)
74         {
75             prevMouseX = eventManager.mouseX;
76             prevMouseY = eventManager.mouseY;
77         }
78     }
79     
80     override void onMouseWheel(int x, int y)
81     {
82         camera.zoom(cast(float)y * 0.2f);
83     }
84 
85     void setZoom(float z)
86     {
87         camera.setZoom(z);
88     }
89 
90     void update(double dt)
91     {
92         processEvents();
93 
94         if (eventManager.mouseButtonPressed[MB_RIGHT])
95         {
96             float shift_x = (eventManager.mouseX - prevMouseX) * 0.1f;
97             float shift_y = -(eventManager.mouseY - prevMouseY) * 0.1f;
98             Vector3f trans = camera.getUpVector * shift_y + camera.getRightVector * shift_x;
99             camera.translateTarget(trans);
100         }
101         else if (eventManager.mouseButtonPressed[MB_LEFT] && eventManager.keyPressed[KEY_LCTRL])
102         {
103             float shift_x = (eventManager.mouseX - prevMouseX);
104             float shift_y = (eventManager.mouseY - prevMouseY);
105             camera.zoom((shift_x + shift_y) * 0.1f);
106         }
107         else if (eventManager.mouseButtonPressed[MB_LEFT])
108         {                
109             float turn_m = (eventManager.mouseX - prevMouseX);
110             float pitch_m = (eventManager.mouseY - prevMouseY);
111             camera.pitch(pitch_m);
112             camera.turn(turn_m);
113         }
114 
115         prevMouseX = eventManager.mouseX;
116         prevMouseY = eventManager.mouseY;
117         
118         camera.update(dt);
119     }
120 
121     Matrix4x4f viewMatrix()
122     {
123         return camera.viewMatrix();
124     }
125     
126     Matrix4x4f invViewMatrix()
127     {
128         return camera.invViewMatrix();
129     }
130     
131     
132     Vector3f cameraPosition()
133     {
134         return camera.getPosition();
135     }
136 }
137