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https://github.com/minetest/irrlicht.git
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226 lines
12 KiB
HTML
226 lines
12 KiB
HTML
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<html>
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<title>Irrlicht Engine Tutorial</title>
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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</head>
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<body bgcolor="#FFFFFF" leftmargin="0" topmargin="0" marginwidth="0" marginheight="0">
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<br>
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<table width="95%" border="0" cellspacing="0" cellpadding="2" align="center">
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<tr>
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<td bgcolor="#666699" width="10"><b><a href="http://irrlicht.sourceforge.net" target="_blank"><img src="../../media/irrlichtlogo.jpg" width="88" height="31" border="0"></a></b></td>
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<td bgcolor="#666699" width="100%">
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<div align="center">
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<div align="center"></div>
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<div align="left"><b><font color="#FFFFFF">Tutorial 5.User Interface</font></b></div>
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</div>
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</td>
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</tr>
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<tr bgcolor="#eeeeff">
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<td height="90" colspan="2">
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<div align="left">
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<p>This tutorial shows how to use the built in User Interface of the Irrlicht
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Engine. It will give a brief overview and show how to create and use
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windows, buttons, scroll bars, static texts and list boxes. </p>
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<p>The program which is described here will look like this:</p>
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<p align="center"><img src="../../media/005shot.jpg" width="259" height="204"><br>
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</p>
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</div>
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</td>
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</tr>
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</table>
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<br>
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<table width="95%" border="0" cellspacing="0" cellpadding="2" align="center">
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<tr>
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<td bgcolor="#666699"> <div align="center"><b><font color="#FFFFFF"></font></b></div>
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<b><font color="#FFFFFF">Lets start!</font></b></td>
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</tr>
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<tr>
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<td height="90" bgcolor="#eeeeff" valign="top"> <div align="left">
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<p>As always, we include the header files (conio and curses for getting
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user input from the console), and use the irrlicht namespaces. We also
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store a pointer to the Irrlicht device, a counter variable for changing
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the creation position of a window, and a pointer to a listbox.</p>
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<table width="95%" border="0" cellspacing="2" cellpadding="0" bgcolor="#CCCCCC" align="center">
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<tr>
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<td> <pre>#include <irrlicht.h>
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#include <iostream><br>
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using namespace irr;</pre>
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<pre>using namespace core;
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using namespace scene;
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using namespace video;
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using namespace io;
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using namespace gui;</pre>
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<pre>#pragma comment(lib, "Irrlicht.lib")</pre>
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<pre>IrrlichtDevice *device = 0;
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s32 cnt = 0;
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IGUIListBox* listbox = 0;
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</pre></td>
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</tr>
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</table>
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<p>The Event Receiver is not only capable of getting keyboard and mouse
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input events, but also events of the graphical user interface (gui).
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There are events for almost everything: Button click, Listbox selection
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change, events that say that a element was hovered and so on. To be
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able to react to some of these events, we create <br>
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an event receiver. We only react to gui events, and if it's such an
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event, we get the id of the caller (the gui element which caused the
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event) and get the pointer to the gui environment. </p>
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<table width="95%" border="0" cellspacing="2" cellpadding="0" bgcolor="#CCCCCC" align="center">
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<tr>
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<td> <pre>class MyEventReceiver : public IEventReceiver<br>{<br>public:<br> virtual bool OnEvent(const SEvent& event)<br> {<br> if (event.EventType == EET_GUI_EVENT)<br> {<br> s32 id = event.GUIEvent.Caller->getID();<br> IGUIEnvironment* env = device->getGUIEnvironment();</pre>
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<pre> switch(event.GUIEvent.EventType)
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{</pre>
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</td>
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</tr>
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</table>
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<p> If a scrollbar changed its scroll position, and it is 'our' scrollbar
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(the one with id 104), then we change the <br>
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transparency of all gui elements. This is a very easy task: There is
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a skin object, in which all color settings are stored. We simply go
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through all colors stored in the skin and change their alpha value.
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</p>
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<table width="95%" border="0" cellspacing="2" cellpadding="0" bgcolor="#CCCCCC" align="center">
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<tr>
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<td height="80"> <pre>case EGET_SCROLL_BAR_CHANGED:<br> if (id == 104)<br> {<br> s32 pos = ((IGUIScrollBar*)event.GUIEvent.Caller)->getPos();<br> <br> for (s32 i=0; i<EGDC_COUNT ; ++i)<br> {<br> SColor col = env->getSkin()->getColor((EGUI_DEFAULT_COLOR)i);<br> col.setAlpha(pos);<br> env->getSkin()->setColor((EGUI_DEFAULT_COLOR)i, col);<br> }<br> }<br>break;</pre></td>
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</tr>
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</table>
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<p>If a button was clicked, it could be one of 'our' three buttons. If
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it is the first, we shut down the engine.<br>
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If it is the second, we create a little window with some text on it.
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We also add a string to the list box to log<br>
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what happened. And if it is the third button, we create a file open
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dialog, and add also this as string to the list box.<br>
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That's all for the event receiver.</p>
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<table width="95%" border="0" cellspacing="2" cellpadding="0" bgcolor="#CCCCCC" align="center">
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<tr>
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<td>
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<pre> case EGET_BUTTON_CLICKED:
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if (id == 101)
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{
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device->closeDevice();
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return true;
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}</pre>
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<pre> if (id == 102)
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{
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listbox->addItem(L"Window created");
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cnt += 30;
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if (cnt > 200)
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cnt = 0;</pre>
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<pre> IGUIWindow* window = env->addWindow(
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rect<s32>(100 + cnt, 100 + cnt, 300 + cnt, 200 + cnt), <br> false, // modal?
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L"Test window");</pre>
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<pre> env->addStaticText(L"Please close me",
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rect<s32>(35,35,140,50),
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true, // border?,
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false, // wordwrap?
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window);
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return true;
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}</pre>
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<pre> if (id == 103)
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{
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listbox->addItem(L"File open");
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env->addFileOpenDialog(L"Please choose a file.");
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return true;
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}</pre>
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<pre> break;
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}
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}
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return false;
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}
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};</pre>
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</td>
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</tr>
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</table>
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<p>Ok, now for the more interesting part. First, create the Irrlicht device.
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As in some examples before, we ask the user which driver he wants to
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use for this example:</p>
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</div>
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<table width="95%" border="0" cellspacing="2" cellpadding="0" bgcolor="#CCCCCC" align="center">
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<tr>
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<td> <pre>int main()
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{
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// ask user for driver
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video::E_DRIVER_TYPE driverType;
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printf("Please select the driver you want for this example:\n"\<br> " (a) Direct3D 9.0c\n (b) Direct3D 8.1\n (c) OpenGL 1.5\n"\<br> " (d) Software Renderer\n (e) Apfelbaum Software Renderer\n"\<br> " (f) NullDevice\n (otherKey) exit\n\n");<br><br> char i;<br> std::cin >> i;<br>
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switch(i)<br> {<br> case 'a': driverType = video::EDT_DIRECT3D9;break;<br> case 'b': driverType = video::EDT_DIRECT3D8;break;<br> case 'c': driverType = video::EDT_OPENGL; break;<br> case 'd': driverType = video::EDT_SOFTWARE; break;<br> case 'e': driverType = video::EDT_BURNINGSVIDEO;break;<br> case 'f': driverType = video::EDT_NULL; break;<br> default: return 1;<br> }
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// create device and exit if creation failed
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device = createDevice(driverType, core::dimension2d<s32>(640, 480));<br>
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if (device == 0)
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return 1;
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</pre>
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</td>
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</tr>
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</table>
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<p>The creation was successful, now we set the event receiver and store
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pointers to the driver and to the gui environment. </p>
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<table width="95%" border="0" cellspacing="2" cellpadding="0" bgcolor="#CCCCCC" align="center">
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<tr>
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<td><pre>MyEventReceiver receiver;
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device->setEventReceiver(&receiver);
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device->setWindowCaption(L"Irrlicht Engine - User Inferface Demo");</pre>
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<pre>video::IVideoDriver* driver = device->getVideoDriver();
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IGUIEnvironment* env = device->getGUIEnvironment();
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</pre>
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</td>
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</tr>
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</table>
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<p>We add three buttons. The first one closes the engine. The second creates
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a window and the third opens a file open dialog. The third parameter is
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the id of the button, with which we can easily identify the button in
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the event receiver.</p>
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<table width="95%" border="0" cellspacing="2" cellpadding="0" bgcolor="#CCCCCC" align="center">
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<tr>
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<td><pre>env->addButton(rect<s32>(10,240,100,270), 0, 101, L"Quit");<br>env->addButton(rect<s32>(10,280,100,320), 0, 102, L"New Window");<br>env->addButton(rect<s32>(10,330,100,370), 0, 103, L"File Open");</pre></td>
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</tr>
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</table>
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<p> Now, we add a static text and a scrollbar, which modifies the transparency
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of all gui elements. We set the maximum value of the scrollbar to 255,
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because that's the maximal value for a color value.<br>
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Then we create an other static text and a list box.</p>
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<table width="95%" border="0" cellspacing="2" cellpadding="0" bgcolor="#CCCCCC" align="center">
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<tr>
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<td><pre>env->addStaticText(L"Transparent Control:", rect<s32>(150,20,350,40), true);<br>IGUIScrollBar* scrollbar = env->addScrollBar(true,
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rect<s32>(150, 45, 350, 60), 0, 104);<br>scrollbar->setMax(255);</pre>
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<pre>env->addStaticText(L"Logging ListBox:", rect<s32>(50,110,250,130), true);
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listbox = env->addListBox(rect<s32>(50, 140, 250, 210));</pre></td>
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</tr>
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</table>
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<br>
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To make the font a little bit nicer, we load an external font and set it
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as new font in the skin. An at last, we create a nice Irrlicht Engine logo
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in the top left corner. <br>
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<br>
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<table width="95%" border="0" cellspacing="2" cellpadding="0" bgcolor="#CCCCCC" align="center">
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<tr>
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<td> <pre>IGUISkin* skin = env->getSkin();<br>IGUIFont* font = env->getFont("../../media/fonthaettenschweiler.bmp");<br>if (font)<br> skin->setFont(font);</pre>
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<pre>IGUIImage* img = env->addImage(<br> driver->getTexture("../../media/irrlichtlogoalpha.tga"),<br> position2d<int>(10,10));</pre></td>
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</tr>
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</table>
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<p>That's all, we only have to draw everything.</p>
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<table width="95%" border="0" cellspacing="2" cellpadding="0" bgcolor="#CCCCCC" align="center">
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<tr>
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<td>
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<pre> while(device->run() && driver)<br> if (device->isWindowActive()) <br> {<br> driver->beginScene(true, true, SColor(0,122,65,171));
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env->drawAll();
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driver->endScene();
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}
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device->drop();</pre>
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<pre> return 0;
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}</pre>
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</td>
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</tr>
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</table>
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</td>
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</tr>
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</table>
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<p> </p>
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</body>
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</html>
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