Improve the swing sample lua application.
This commit is contained in:
James Roseborough
13
README.html
13
README.html
@@ -19,7 +19,7 @@ Getting Started with LuaJ
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James Roseborough, Ian Farmer, Version 2.0.3
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<p>
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<small>
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Copyright © 2009-2010 Luaj.org.
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Copyright © 2009-2012 Luaj.org.
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Freely available under the terms of the
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<a href="http://sourceforge.net/dbimage.php?id=196142">Luaj license</a>.
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</small>
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@@ -191,6 +191,12 @@ You should see the following output:
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hello, world
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</pre>
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To see how luaj can be used to acccess most Java API's including swing, try:
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<pre>
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java -cp lib/luaj-jse-2.0.3.jar lua examples/lua/swingapp.lua
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</pre>
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<h2>Compile lua source to lua bytecode</h2>
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<p>
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@@ -501,7 +507,7 @@ The <em>JsePlatform.standardGlobals()</em> includes the <em>luajava</em> library
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It is patterned after the original <a href="http://www.keplerproject.org/luajava/">luajava project</a>.
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<p>
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The following lua script will open a swiing frame on Java SE:
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The following lua script will open a swing frame on Java SE:
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<pre>
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jframe = luajava.bindClass( "javax.swing.JFrame" )
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frame = luajava.newInstance( "javax.swing.JFrame", "Texts" );
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@@ -511,7 +517,8 @@ The following lua script will open a swiing frame on Java SE:
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</pre>
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<p>
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See a longer sample in <em>examples/lua/swingapp.lua</em> for details, or try running it using:
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See a longer sample in <em>examples/lua/swingapp.lua</em> for details, including a simple animation loop, rendering graphics, mouse and key handling, and image loading.
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Or try running it using:
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<pre>
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java -cp lib/luaj-jse-2.0.3.jar lua examples/lua/swingapp.lua
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</pre>
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BIN
examples/lua/logo.gif
Normal file
BIN
examples/lua/logo.gif
Normal file
Binary file not shown.
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After Width: | Height: | Size: 2.6 KiB |
@@ -1,29 +1,132 @@
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frame = luajava.newInstance( "javax.swing.JFrame", "Texts" );
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pane = luajava.newInstance( "javax.swing.JPanel" );
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borderFactory = luajava.bindClass( "javax.swing.BorderFactory" )
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border = borderFactory:createEmptyBorder( 30, 30, 10, 30 )
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pane:setBorder( border )
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label = luajava.newInstance( "javax.swing.JLabel", "This is a Label" );
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-- Sample luaj program that presents an animated Swing window.
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--
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-- This basic application handles key, and mouse input, has a basic animation loop,
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-- and renders double-buffered graphics including the logo image in a swing frame.
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--
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-- bind to classes we need
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local borderLayout = luajava.bindClass("java.awt.BorderLayout")
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local jframe = luajava.bindClass("javax.swing.JFrame")
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local bufferedImage = luajava.bindClass("java.awt.image.BufferedImage")
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local swingUtilities = luajava.bindClass("javax.swing.SwingUtilities")
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local thread = luajava.bindClass("java.lang.Thread")
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layout = luajava.newInstance( "java.awt.GridLayout", 2, 2 );
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pane:setLayout( layout )
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pane:add( label )
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pane:setBounds( 20, 30, 10, 30 )
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-- set up frame, get content pane
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local frame = luajava.newInstance("javax.swing.JFrame", "Sample Luaj Application");
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local content = frame:getContentPane()
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borderLayout = luajava.bindClass( "java.awt.BorderLayout" )
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frame:getContentPane():add(pane, borderLayout.CENTER )
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jframe = luajava.bindClass( "javax.swing.JFrame" )
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-- add a buffered image as content
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local image = luajava.newInstance("java.awt.image.BufferedImage", 640, 480, bufferedImage.TYPE_INT_RGB)
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local icon = luajava.newInstance("javax.swing.ImageIcon", image)
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local label = luajava.newInstance("javax.swing.JLabel", icon)
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-- add the main pane to the main content
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content:add(label, borderLayout.CENTER)
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frame:setDefaultCloseOperation(jframe.EXIT_ON_CLOSE)
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frame:pack()
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-- simple animation framework
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local tick,animate,render
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local tnext = 0
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tick = luajava.createProxy("java.lang.Runnable", {
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run = function()
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swingUtilities:invokeLater(tick)
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if os.time()< tnext then return thread:sleep(1) end
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tnext = math.max(os.time(),tnext+1000/60)
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pcall(animate)
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pcall(render)
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label:repaint(0,0,0,640,480)
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end
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})
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-- the animation step moves the line endpoints
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local x1,y1,x2,y2,xi,yi = 160,240,480,240,0,0
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local vx1,vy1,vx2,vy2,vxi,vyi = -5,-6,7,8,3,1
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local advance = function(x,vx,max,rnd)
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x = x + vx
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if x < 0 then
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return 0, math.random(2,10)
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elseif x > max then
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return max, math.random(-10,-2)
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end
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return x, vx
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end
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animate = function()
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x1,y1,x2,y2 = x1+1,y1+1,x2-1,y2-1
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x1,vx1 = advance(x1,vx1,640)
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y1,vy1 = advance(y1,vy1,480)
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x2,vx2 = advance(x2,vx2,640)
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y2,vy2 = advance(y2,vy2,480)
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xi,vxi = advance(xi,vxi,540)
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yi,vyi = advance(yi,vyi,380)
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end
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-- try loading the logo image from a couple locations
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local imageio = luajava.bindClass("javax.imageio.ImageIO")
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local file = luajava.bindClass("java.io.File")
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local loadimage = function(path)
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local s,i = pcall(imageio.read, imageio, luajava.new(file, path))
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return s and i
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end
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local logo = loadimage("logo.gif") or loadimage("examples/lua/logo.gif")
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-- the render step draws the scene
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local g = image:getGraphics()
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local bg = luajava.newInstance("java.awt.Color", 0x22112244, true);
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local fg = luajava.newInstance("java.awt.Color", 0xffaa33);
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render = function()
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g:setColor(bg)
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g:fillRect(0,0,640,480)
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if logo then g:drawImage(logo,xi,yi) end
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g:setColor(fg)
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g:drawLine(x1,y1,x2,y2)
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end
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-- add mouse listeners for specific mouse events
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label:addMouseListener(luajava.createProxy("java.awt.event.MouseListener", {
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mousePressed = function(e)
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--print('mousePressed', e:getX(), e:getY(), e)
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x1,y1 = e:getX(),e:getY()
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end,
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-- mouseClicked = function(e) end,
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-- mouseEntered = function(e) end,
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-- mouseExited = function(e) end,
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-- mouseReleased = function(e) end,
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}))
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label:addMouseMotionListener(luajava.createProxy("java.awt.event.MouseMotionListener", {
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mouseDragged = function(e)
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--print('mouseDragged', e:getX(), e:getY(), e)
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x2,y2 = e:getX(),e:getY()
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end,
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-- mouseMoved= function(e) end,
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}))
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-- add key listeners
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frame:addKeyListener(luajava.createProxy("java.awt.event.KeyListener", {
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keyPressed = function(e)
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local id, code, char, text = e:getID(), e:getKeyCode(), e:getKeyChar(), e:getKeyText(e:getKeyCode())
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print('key id, code, char, text, pcall(string.char,char)', id, code, char, text, pcall(string.char,char))
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end,
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-- keyReleased = function(e) end,
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-- keyTyped = function(e) end,
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}))
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-- use the window listener to kick off animation
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frame:addWindowListener(luajava.createProxy("java.awt.event.WindowListener", {
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windowOpened = function(e)
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swingUtilities:invokeLater(tick)
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end,
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-- windowActivated = function(e) end,
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-- windowClosed = function(e) end,
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-- windowClosing = function(e) end,
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-- windowDeactivated = function(e) end,
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-- windowDeiconified = function(e) end,
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-- windowIconified = function(e) end,
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}))
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-- utility function to load an image from a file, for reference
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local loadimage = function(filename)
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end
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-- Set window visible last to start app.
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frame:setVisible(true)
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local listener = luajava.createProxy("java.awt.event.MouseListener",
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{
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mouseClicked = function(me)
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print("clicked!", me)
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end
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})
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frame:addMouseListener(listener)
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