dgl.templates.freeview source code

1 /*
2 Copyright (c) 2014-2015 Timur Gafarov
3 
4 Boost Software License - Version 1.0 - August 17th, 2003
5 
6 Permission is hereby granted, free of charge, to any person or organization
7 obtaining a copy of the software and accompanying documentation covered by
8 this license (the "Software") to use, reproduce, display, distribute,
9 execute, and transmit the Software, and to prepare derivative works of the
10 Software, and to permit third-parties to whom the Software is furnished to
11 do so, all subject to the following:
12 
13 The copyright notices in the Software and this entire statement, including
14 the above license grant, this restriction and the following disclaimer,
15 must be included in all copies of the Software, in whole or in part, and
16 all derivative works of the Software, unless such copies or derivative
17 works are solely in the form of machine-executable object code generated by
18 a source language processor.
19 
20 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
21 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
22 FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
23 SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
24 FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
25 ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
26 DEALINGS IN THE SOFTWARE.
27 */
28 
29 module dgl.templates.freeview;
30 
31 import derelict.sdl.sdl;
32 import derelict.opengl.gl;
33 
34 import dlib.core.memory;
35 import dlib.image.color;
36 
37 import dgl.core.event;
38 import dgl.core.layer;
39 import dgl.graphics.tbcamera;
40 
41 class FreeviewLayer: Layer
42 {
43     TrackballCamera camera;
44     int tempMouseX = 0;
45     int tempMouseY = 0;
46 
47     bool grabMouse = true;
48 
49     this(EventManager emngr)
50     {
51         super(emngr, LayerType.Layer3D);
52 
53         camera = New!TrackballCamera();
54         camera.pitch(45.0f);
55         camera.turn(45.0f);
56         camera.setZoom(20.0f);
57         addModifier(camera);
58     }
59 
60     override void free()
61     {
62         Delete(this);
63     }
64 
65     ~this()
66     {
67         camera.free();
68     }
69 
70     override void onMouseButtonDown(int button)
71     {
72         if (grabMouse)
73         {
74             if (button == SDL_BUTTON_RIGHT)
75             {
76                 tempMouseX = eventManager.mouseX;
77                 tempMouseY = eventManager.mouseY;
78                 eventManager.setMouseToCenter();
79             }
80             else if (button == SDL_BUTTON_MIDDLE)
81             {
82                 tempMouseX = eventManager.mouseX;
83                 tempMouseY = eventManager.mouseY;
84                 eventManager.setMouseToCenter();
85             }
86             else if (button == SDL_BUTTON_WHEELUP)
87             {
88                 camera.zoomSmooth(-2.0f, 16.0f);
89             }
90             else if (button == SDL_BUTTON_WHEELDOWN)
91             {
92                 camera.zoomSmooth(2.0f, 16.0f);
93             }
94         }
95     }
96 
97     override void onMouseButtonUp(int button)
98     {
99         if (grabMouse)
100         {
101             if (button == SDL_BUTTON_RIGHT)
102             {
103                 eventManager.setMouse(tempMouseX, tempMouseY);
104             }
105             else if (button == SDL_BUTTON_MIDDLE)
106             {
107                 eventManager.setMouse(tempMouseX, tempMouseY);
108             }
109         }
110     }
111 
112     override void draw(double dt)
113     {
114         if (grabMouse)
115         {
116             if (eventManager.mouseButtonPressed[SDL_BUTTON_RIGHT])
117             {
118                 float turn_m = (cast(float)eventManager.windowWidth/2 - eventManager.mouseX)/8.0f;
119                 float pitch_m = -(cast(float)eventManager.windowHeight/2 - eventManager.mouseY)/8.0f;
120                 camera.pitchSmooth(pitch_m, 16.0f);
121                 camera.turnSmooth(turn_m, 16.0f);
122                 eventManager.setMouseToCenter();
123                 eventManager.showCursor(false);
124             }
125             else if (eventManager.mouseButtonPressed[SDL_BUTTON_MIDDLE] ||
126                     (eventManager.mouseButtonPressed[SDL_BUTTON_LEFT] && eventManager.keyPressed[SDLK_LSHIFT]))
127             {
128                 float shift_x = (cast(float)eventManager.windowWidth/2 - eventManager.mouseX)/16.0f;
129                 float shift_y = (cast(float)eventManager.windowHeight/2 - eventManager.mouseY)/16.0f;
130                 camera.moveSmooth(shift_y, 16.0f);
131                 camera.strafeSmooth(-shift_x, 16.0f);
132                 eventManager.setMouseToCenter();
133                 eventManager.showCursor(false);
134             }
135             else
136                 eventManager.showCursor(true);
137         }
138 
139         super.draw(dt);
140     }
141 }