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Diffstat (limited to 'examples/06.2DGraphics/main.cpp')
| -rw-r--r-- | examples/06.2DGraphics/main.cpp | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/examples/06.2DGraphics/main.cpp b/examples/06.2DGraphics/main.cpp new file mode 100644 index 0000000..40e311a --- /dev/null +++ b/examples/06.2DGraphics/main.cpp @@ -0,0 +1,166 @@ +/** Example 006 2D Graphics
+
+This Tutorial shows how to do 2d graphics with the Irrlicht Engine.
+It shows how to draw images, keycolor based sprites,
+transparent rectangles, and different fonts. You may consider
+this useful if you want to make a 2d game with the engine, or if
+you want to draw a cool interface or head up display for your 3d game.
+
+As always, I include the header files, use the irr namespace,
+and tell the linker to link with the .lib file.
+*/
+#include <irrlicht.h>
+#include "driverChoice.h"
+
+using namespace irr;
+
+#ifdef _MSC_VER
+#pragma comment(lib, "Irrlicht.lib")
+#endif
+
+/*
+At first, we let the user select the driver type, then start up the engine, set
+a caption, and get a pointer to the video driver.
+*/
+int main()
+{
+ // ask user for driver
+ video::E_DRIVER_TYPE driverType=driverChoiceConsole();
+ if (driverType==video::EDT_COUNT)
+ return 1;
+
+ // create device
+
+ IrrlichtDevice *device = createDevice(driverType,
+ core::dimension2d<u32>(512, 384));
+
+ if (device == 0)
+ return 1; // could not create selected driver.
+
+ device->setWindowCaption(L"Irrlicht Engine - 2D Graphics Demo");
+
+ video::IVideoDriver* driver = device->getVideoDriver();
+
+ /*
+ All 2d graphics in this example are put together into one texture,
+ 2ddemo.png. Because we want to draw colorkey based sprites, we need to
+ load this texture and tell the engine, which part of it should be
+ transparent based on a colorkey.
+
+ In this example, we don't tell it the color directly, we just say "Hey
+ Irrlicht Engine, you'll find the color I want at position (0,0) on the
+ texture.". Instead, it would be also possible to call
+ driver->makeColorKeyTexture(images, video::SColor(0,0,0,0)), to make
+ e.g. all black pixels transparent. Please note that
+ makeColorKeyTexture just creates an alpha channel based on the color.
+ */
+ video::ITexture* images = driver->getTexture("../../media/2ddemo.png");
+ driver->makeColorKeyTexture(images, core::position2d<s32>(0,0));
+
+ /*
+ To be able to draw some text with two different fonts, we first load
+ them. Ok, we load just one. As the first font we just use the default
+ font which is built into the engine. Also, we define two rectangles
+ which specify the position of the images of the red imps (little flying
+ creatures) in the texture.
+ */
+ gui::IGUIFont* font = device->getGUIEnvironment()->getBuiltInFont();
+ gui::IGUIFont* font2 =
+ device->getGUIEnvironment()->getFont("../../media/fonthaettenschweiler.bmp");
+
+ core::rect<s32> imp1(349,15,385,78);
+ core::rect<s32> imp2(387,15,423,78);
+
+ /*
+ Prepare a nicely filtering 2d render mode for special cases.
+ */
+ driver->getMaterial2D().TextureLayer[0].BilinearFilter=true;
+ driver->getMaterial2D().AntiAliasing=video::EAAM_FULL_BASIC;
+
+ /*
+ Everything is prepared, now we can draw everything in the draw loop,
+ between the begin scene and end scene calls. In this example, we are
+ just doing 2d graphics, but it would be no problem to mix them with 3d
+ graphics. Just try it out, and draw some 3d vertices or set up a scene
+ with the scene manager and draw it.
+ */
+ while(device->run() && driver)
+ {
+ if (device->isWindowActive())
+ {
+ u32 time = device->getTimer()->getTime();
+
+ driver->beginScene(true, true, video::SColor(255,120,102,136));
+
+ /*
+ First, we draw 3 sprites, using the alpha channel we
+ created with makeColorKeyTexture. The last parameter
+ specifies that the drawing method should use this alpha
+ channel. The last-but-one parameter specifies a
+ color, with which the sprite should be colored.
+ (255,255,255,255) is full white, so the sprite will
+ look like the original. The third sprite is drawn
+ with the red channel modulated based on the time.
+ */
+
+ // draw fire & dragons background world
+ driver->draw2DImage(images, core::position2d<s32>(50,50),
+ core::rect<s32>(0,0,342,224), 0,
+ video::SColor(255,255,255,255), true);
+
+ // draw flying imp
+ driver->draw2DImage(images, core::position2d<s32>(164,125),
+ (time/500 % 2) ? imp1 : imp2, 0,
+ video::SColor(255,255,255,255), true);
+
+ // draw second flying imp with colorcylce
+ driver->draw2DImage(images, core::position2d<s32>(270,105),
+ (time/500 % 2) ? imp1 : imp2, 0,
+ video::SColor(255,(time) % 255,255,255), true);
+
+ /*
+ Drawing text is really simple. The code should be self
+ explanatory.
+ */
+
+ // draw some text
+ if (font)
+ font->draw(L"This demo shows that Irrlicht is also capable of drawing 2D graphics.",
+ core::rect<s32>(130,10,300,50),
+ video::SColor(255,255,255,255));
+
+ // draw some other text
+ if (font2)
+ font2->draw(L"Also mixing with 3d graphics is possible.",
+ core::rect<s32>(130,20,300,60),
+ video::SColor(255,time % 255,time % 255,255));
+
+ /*
+ Next, we draw the Irrlicht Engine logo (without
+ using a color or an alpha channel). Since we slightly scale
+ the image we use the prepared filter mode.
+ */
+ driver->enableMaterial2D();
+ driver->draw2DImage(images, core::rect<s32>(10,10,108,48),
+ core::rect<s32>(354,87,442,118));
+ driver->enableMaterial2D(false);
+
+ /*
+ Finally draw a half-transparent rect under the mouse cursor.
+ */
+ core::position2d<s32> m = device->getCursorControl()->getPosition();
+ driver->draw2DRectangle(video::SColor(100,255,255,255),
+ core::rect<s32>(m.X-20, m.Y-20, m.X+20, m.Y+20));
+
+ driver->endScene();
+ }
+ }
+
+ device->drop();
+
+ return 0;
+}
+
+/*
+That's all. I hope it was not too difficult.
+**/
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