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1/** Example 006 2D Graphics
2
3This Tutorial shows how to do 2d graphics with the Irrlicht Engine.
4It shows how to draw images, keycolor based sprites,
5transparent rectangles, and different fonts. You may consider
6this useful if you want to make a 2d game with the engine, or if
7you want to draw a cool interface or head up display for your 3d game.
8
9As always, I include the header files, use the irr namespace,
10and tell the linker to link with the .lib file.
11*/
12#include <irrlicht.h>
13#include "driverChoice.h"
14
15using namespace irr;
16
17#ifdef _MSC_VER
18#pragma comment(lib, "Irrlicht.lib")
19#endif
20
21/*
22At first, we let the user select the driver type, then start up the engine, set
23a caption, and get a pointer to the video driver.
24*/
25int main()
26{
27 // ask user for driver
28 video::E_DRIVER_TYPE driverType=driverChoiceConsole();
29 if (driverType==video::EDT_COUNT)
30 return 1;
31
32 // create device
33
34 IrrlichtDevice *device = createDevice(driverType,
35 core::dimension2d<u32>(512, 384));
36
37 if (device == 0)
38 return 1; // could not create selected driver.
39
40 device->setWindowCaption(L"Irrlicht Engine - 2D Graphics Demo");
41
42 video::IVideoDriver* driver = device->getVideoDriver();
43
44 /*
45 All 2d graphics in this example are put together into one texture,
46 2ddemo.png. Because we want to draw colorkey based sprites, we need to
47 load this texture and tell the engine, which part of it should be
48 transparent based on a colorkey.
49
50 In this example, we don't tell it the color directly, we just say "Hey
51 Irrlicht Engine, you'll find the color I want at position (0,0) on the
52 texture.". Instead, it would be also possible to call
53 driver->makeColorKeyTexture(images, video::SColor(0,0,0,0)), to make
54 e.g. all black pixels transparent. Please note that
55 makeColorKeyTexture just creates an alpha channel based on the color.
56 */
57 video::ITexture* images = driver->getTexture("../../media/2ddemo.png");
58 driver->makeColorKeyTexture(images, core::position2d<s32>(0,0));
59
60 /*
61 To be able to draw some text with two different fonts, we first load
62 them. Ok, we load just one. As the first font we just use the default
63 font which is built into the engine. Also, we define two rectangles
64 which specify the position of the images of the red imps (little flying
65 creatures) in the texture.
66 */
67 gui::IGUIFont* font = device->getGUIEnvironment()->getBuiltInFont();
68 gui::IGUIFont* font2 =
69 device->getGUIEnvironment()->getFont("../../media/fonthaettenschweiler.bmp");
70
71 core::rect<s32> imp1(349,15,385,78);
72 core::rect<s32> imp2(387,15,423,78);
73
74 /*
75 Prepare a nicely filtering 2d render mode for special cases.
76 */
77 driver->getMaterial2D().TextureLayer[0].BilinearFilter=true;
78 driver->getMaterial2D().AntiAliasing=video::EAAM_FULL_BASIC;
79
80 /*
81 Everything is prepared, now we can draw everything in the draw loop,
82 between the begin scene and end scene calls. In this example, we are
83 just doing 2d graphics, but it would be no problem to mix them with 3d
84 graphics. Just try it out, and draw some 3d vertices or set up a scene
85 with the scene manager and draw it.
86 */
87 while(device->run() && driver)
88 {
89 if (device->isWindowActive())
90 {
91 u32 time = device->getTimer()->getTime();
92
93 driver->beginScene(true, true, video::SColor(255,120,102,136));
94
95 /*
96 First, we draw 3 sprites, using the alpha channel we
97 created with makeColorKeyTexture. The last parameter
98 specifies that the drawing method should use this alpha
99 channel. The last-but-one parameter specifies a
100 color, with which the sprite should be colored.
101 (255,255,255,255) is full white, so the sprite will
102 look like the original. The third sprite is drawn
103 with the red channel modulated based on the time.
104 */
105
106 // draw fire & dragons background world
107 driver->draw2DImage(images, core::position2d<s32>(50,50),
108 core::rect<s32>(0,0,342,224), 0,
109 video::SColor(255,255,255,255), true);
110
111 // draw flying imp
112 driver->draw2DImage(images, core::position2d<s32>(164,125),
113 (time/500 % 2) ? imp1 : imp2, 0,
114 video::SColor(255,255,255,255), true);
115
116 // draw second flying imp with colorcylce
117 driver->draw2DImage(images, core::position2d<s32>(270,105),
118 (time/500 % 2) ? imp1 : imp2, 0,
119 video::SColor(255,(time) % 255,255,255), true);
120
121 /*
122 Drawing text is really simple. The code should be self
123 explanatory.
124 */
125
126 // draw some text
127 if (font)
128 font->draw(L"This demo shows that Irrlicht is also capable of drawing 2D graphics.",
129 core::rect<s32>(130,10,300,50),
130 video::SColor(255,255,255,255));
131
132 // draw some other text
133 if (font2)
134 font2->draw(L"Also mixing with 3d graphics is possible.",
135 core::rect<s32>(130,20,300,60),
136 video::SColor(255,time % 255,time % 255,255));
137
138 /*
139 Next, we draw the Irrlicht Engine logo (without
140 using a color or an alpha channel). Since we slightly scale
141 the image we use the prepared filter mode.
142 */
143 driver->enableMaterial2D();
144 driver->draw2DImage(images, core::rect<s32>(10,10,108,48),
145 core::rect<s32>(354,87,442,118));
146 driver->enableMaterial2D(false);
147
148 /*
149 Finally draw a half-transparent rect under the mouse cursor.
150 */
151 core::position2d<s32> m = device->getCursorControl()->getPosition();
152 driver->draw2DRectangle(video::SColor(100,255,255,255),
153 core::rect<s32>(m.X-20, m.Y-20, m.X+20, m.Y+20));
154
155 driver->endScene();
156 }
157 }
158
159 device->drop();
160
161 return 0;
162}
163
164/*
165That's all. I hope it was not too difficult.
166**/
generated by cgit v1.1 at 2024-05-15 22:15:24 +0000