-Copyright © 2009-2010 Luaj.org. +Copyright © 2009-2012 Luaj.org. Freely available under the terms of the Luaj license. @@ -191,6 +191,12 @@ You should see the following output: hello, world +To see how luaj can be used to acccess most Java API's including swing, try: + +
+ java -cp lib/luaj-jse-2.0.3.jar lua examples/lua/swingapp.lua ++
@@ -501,7 +507,7 @@ The JsePlatform.standardGlobals() includes the luajava library It is patterned after the original luajava project.
-The following lua script will open a swiing frame on Java SE: +The following lua script will open a swing frame on Java SE:
jframe = luajava.bindClass( "javax.swing.JFrame" ) frame = luajava.newInstance( "javax.swing.JFrame", "Texts" ); @@ -511,7 +517,8 @@ The following lua script will open a swiing frame on Java SE:
-See a longer sample in examples/lua/swingapp.lua for details, or try running it using: +See a longer sample in examples/lua/swingapp.lua for details, including a simple animation loop, rendering graphics, mouse and key handling, and image loading. +Or try running it using:
java -cp lib/luaj-jse-2.0.3.jar lua examples/lua/swingapp.luadiff --git a/examples/lua/logo.gif b/examples/lua/logo.gif new file mode 100644 index 00000000..193e6920 Binary files /dev/null and b/examples/lua/logo.gif differ diff --git a/examples/lua/swingapp.lua b/examples/lua/swingapp.lua index 37775b6d..2e1b6f0f 100644 --- a/examples/lua/swingapp.lua +++ b/examples/lua/swingapp.lua @@ -1,29 +1,132 @@ - -frame = luajava.newInstance( "javax.swing.JFrame", "Texts" ); -pane = luajava.newInstance( "javax.swing.JPanel" ); -borderFactory = luajava.bindClass( "javax.swing.BorderFactory" ) -border = borderFactory:createEmptyBorder( 30, 30, 10, 30 ) -pane:setBorder( border ) -label = luajava.newInstance( "javax.swing.JLabel", "This is a Label" ); +-- Sample luaj program that presents an animated Swing window. +-- +-- This basic application handles key, and mouse input, has a basic animation loop, +-- and renders double-buffered graphics including the logo image in a swing frame. +-- +-- bind to classes we need +local borderLayout = luajava.bindClass("java.awt.BorderLayout") +local jframe = luajava.bindClass("javax.swing.JFrame") +local bufferedImage = luajava.bindClass("java.awt.image.BufferedImage") +local swingUtilities = luajava.bindClass("javax.swing.SwingUtilities") +local thread = luajava.bindClass("java.lang.Thread") -layout = luajava.newInstance( "java.awt.GridLayout", 2, 2 ); -pane:setLayout( layout ) -pane:add( label ) -pane:setBounds( 20, 30, 10, 30 ) +-- set up frame, get content pane +local frame = luajava.newInstance("javax.swing.JFrame", "Sample Luaj Application"); +local content = frame:getContentPane() -borderLayout = luajava.bindClass( "java.awt.BorderLayout" ) -frame:getContentPane():add(pane, borderLayout.CENTER ) -jframe = luajava.bindClass( "javax.swing.JFrame" ) +-- add a buffered image as content +local image = luajava.newInstance("java.awt.image.BufferedImage", 640, 480, bufferedImage.TYPE_INT_RGB) +local icon = luajava.newInstance("javax.swing.ImageIcon", image) +local label = luajava.newInstance("javax.swing.JLabel", icon) + +-- add the main pane to the main content +content:add(label, borderLayout.CENTER) frame:setDefaultCloseOperation(jframe.EXIT_ON_CLOSE) frame:pack() + +-- simple animation framework +local tick,animate,render +local tnext = 0 +tick = luajava.createProxy("java.lang.Runnable", { + run = function() + swingUtilities:invokeLater(tick) + if os.time()< tnext then return thread:sleep(1) end + tnext = math.max(os.time(),tnext+1000/60) + pcall(animate) + pcall(render) + label:repaint(0,0,0,640,480) + end +}) + +-- the animation step moves the line endpoints +local x1,y1,x2,y2,xi,yi = 160,240,480,240,0,0 +local vx1,vy1,vx2,vy2,vxi,vyi = -5,-6,7,8,3,1 +local advance = function(x,vx,max,rnd) + x = x + vx + if x < 0 then + return 0, math.random(2,10) + elseif x > max then + return max, math.random(-10,-2) + end + return x, vx +end +animate = function() + x1,y1,x2,y2 = x1+1,y1+1,x2-1,y2-1 + x1,vx1 = advance(x1,vx1,640) + y1,vy1 = advance(y1,vy1,480) + x2,vx2 = advance(x2,vx2,640) + y2,vy2 = advance(y2,vy2,480) + xi,vxi = advance(xi,vxi,540) + yi,vyi = advance(yi,vyi,380) +end + +-- try loading the logo image from a couple locations +local imageio = luajava.bindClass("javax.imageio.ImageIO") +local file = luajava.bindClass("java.io.File") +local loadimage = function(path) + local s,i = pcall(imageio.read, imageio, luajava.new(file, path)) + return s and i +end +local logo = loadimage("logo.gif") or loadimage("examples/lua/logo.gif") + +-- the render step draws the scene +local g = image:getGraphics() +local bg = luajava.newInstance("java.awt.Color", 0x22112244, true); +local fg = luajava.newInstance("java.awt.Color", 0xffaa33); +render = function() + g:setColor(bg) + g:fillRect(0,0,640,480) + if logo then g:drawImage(logo,xi,yi) end + g:setColor(fg) + g:drawLine(x1,y1,x2,y2) +end + +-- add mouse listeners for specific mouse events +label:addMouseListener(luajava.createProxy("java.awt.event.MouseListener", { + mousePressed = function(e) + --print('mousePressed', e:getX(), e:getY(), e) + x1,y1 = e:getX(),e:getY() + end, + -- mouseClicked = function(e) end, + -- mouseEntered = function(e) end, + -- mouseExited = function(e) end, + -- mouseReleased = function(e) end, +})) +label:addMouseMotionListener(luajava.createProxy("java.awt.event.MouseMotionListener", { + mouseDragged = function(e) + --print('mouseDragged', e:getX(), e:getY(), e) + x2,y2 = e:getX(),e:getY() + end, + -- mouseMoved= function(e) end, +})) + +-- add key listeners +frame:addKeyListener(luajava.createProxy("java.awt.event.KeyListener", { + keyPressed = function(e) + local id, code, char, text = e:getID(), e:getKeyCode(), e:getKeyChar(), e:getKeyText(e:getKeyCode()) + print('key id, code, char, text, pcall(string.char,char)', id, code, char, text, pcall(string.char,char)) + end, + -- keyReleased = function(e) end, + -- keyTyped = function(e) end, +})) + +-- use the window listener to kick off animation +frame:addWindowListener(luajava.createProxy("java.awt.event.WindowListener", { + windowOpened = function(e) + swingUtilities:invokeLater(tick) + end, + -- windowActivated = function(e) end, + -- windowClosed = function(e) end, + -- windowClosing = function(e) end, + -- windowDeactivated = function(e) end, + -- windowDeiconified = function(e) end, + -- windowIconified = function(e) end, +})) + +-- utility function to load an image from a file, for reference +local loadimage = function(filename) +end + +-- Set window visible last to start app. frame:setVisible(true) - -local listener = luajava.createProxy("java.awt.event.MouseListener", - { - mouseClicked = function(me) - print("clicked!", me) - end - }) - -frame:addMouseListener(listener)