Java Game start: (ii) graphics base and display text

Graphics | Show Basic Concepts!


screen Resolution: The screen area in pixel, such as 800*600


bit Depth: Displays the number of colors. such as 8-bit 256-color, 16-bit 65536-color


refresh rate: unit Hz





a useful Object!


Window object: Represents the screen content and can be viewed as a drawing canvas, such as JFrame is a subclass of window


DisplayMode object: Used to specify screen resolution, bit depth, and refresh rate


GraphicsDevice object: Used to change the display properties, can be seen as manipulating the graphics interface, by Graphicsenvironment object to obtain





An example of putting jframe into full screen!


import java.awt.*;


import Javax.swing.JFrame;


//Prepare three objects first


JFrame jf=new JFrame ();


displaymode displaymode=new DisplayMode (800,600,16,75);


graphicsdevice device=graphicsenvironment.getlocalgraphicsenvironment (). Getdefaultscreendevice ();


//jframe to full screen


Device.setfullscreenwindow (JF);


//Change display mode


Device.setdisplaymode (DisplayMode);


//Exit Full screen


Device.setfullscreenwindow (NULL);


//Want to make the effect better, you can change the way jframe is displayed. such as:


Jf.setundecorated (TRUE);


jf.setresizable (FALSE);


//In addition, you need to add the necessary judgment and catch exceptions when changing the display mode, like this:


if (device.isdisplaychangesupported ()) {


try {


Device.setdisplaymode (DisplayMode);


}catch (IllegalArgumentException ex) {}


}


//show a HelloWorld try? Add in a jframe:


public void Paint (Graphics g) {


g.drawstring ("Hello world!", 20, 50);


}


//Text can be used Java.awt.Graphics2D class Anti-aliasing!


public void Paint (Graphics g) {


if (g instanceof graphics2d) {


graphics2d g2d= (graphics2d) g;//graphics2d is a subclass of graphics


//anti-aliasing, drawing quality, etc. can refer to the Renderinghints class document!


G2d.setrenderinghint (renderinghints.key_text_antialiasing,renderinghints.value_text_antialias_on);


}


g.drawstring ("Hello world!", 20, 50);


}


almost, the next write draw graphics!