Corona SDK is a software development kit that allows developers to code mobile apps faster using the Lua programming language. Lua is an industry standard scripting language that is simple yet powerful. Corona allows developers to write their code once and deploy their apps to multiple mobile app stores.

1. Corona SDK
®
Code less. Play more.
anscamobile.com

2. Corona SDK
®
Code less. Play more.
Nate Ryan
anscamobile.com

4. @FullyCroisened
@CoronaLabs
anscamobile.com

5. display.newImage( "sky.png" )
local ground = display.newImage("ground.png", 0, 400)
local crate = display.newImage("crate.png", 160, 50 );
crate.rotation = 30
local physics = require("physics")
physics.start()
physics.addBody( ground, "static", { friction=0.5, bounce=0.3 } )
physics.addBody( crate, { density=0.9, friction=0.3, bounce=0.3} )
Write once
Corona
Develop 10x faster
Publish to top stores The ultimate
Monetize and distribute
mobile platform
Available on
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6. Developers Like You
Indies + Game Studios +
Publishers + Agencies
#1 #1
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7. anscamobile.com

8. What is Corona?
SDK for native apps
...
develop 5-10x faster
same code, multiple stores
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9. anscamobile.com

10. Lua: An Industry Standard
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11. Roberto Lerusalimschy
one of the original Lua
founders (1993) now sits
on the advisory board
with Corona Labs.
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12. • Dynamically Typed
• Extremely fast and efficient
• First Class functions
• TABLES! (associative arrays, dictionary, collection)
• Can run on any platform with ANSI C
• Embeddable and extensible
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13. Other Languages –> Lua
if (not carMoving) then
if (!carMoving) {
-- do something
// do something
elseif (noGas) then
} else if (noGas) {
-- something else
// something else
end
}
for i = 1,10 do
for (i=1; i<=10; i++) {
print(i)
print(i)
end
}
for j = 100,1,-1 do
for (j=100; j>0; j--) {
print(j)
print(j)
end
}
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14. Lua Objects are
myTable = { "a", "b", 100, "hello" }
Tables
otherTable = { x=5, y=7, name="Joe" }
newTable = {}
newTable[1] = "a"
newTable.x = 5
newTable.hasProperties = true
newTable["name"] = "Joe"
newTable["printJoe"] = function() print("Joe") end
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15. • [[-- Comments --]]
• x,y = y,x (multiple assignments)
• ~= (non equality)
• 1 based indexing
• no classes, OO implemented with tables and functions
• Inheritance Implemented with metatable
anscamobile.com

16. W e bK base
data
Tons of S Q Li t
File
e
read
/ write
i
p t in g lan
g uage
a
p hics
a scr e d gr
ll Lu lerat
Features/APIs Fu
Hard
w are-a
cce
s , acc
e lero m
eter
cal b
o d ies
mpas p hysi
• Content scaling
GP S, co
e and
co m plex
TP, HTTP
F <html5> or l
, etc.)
ocal
)
S impl TCP, g
o rk ing ( tre amin tion,
Netw (s c
ack s, f ri
playb (mas etc.
• Multi-resolution Vi de
o
i cal pr
o perti
e
n
s
g es, p
u lleys
,
n dent
Phys ls, hi de p e
images
ts, whee w i t h in g pre
Jo in es lu d i
n
sprit c
m ate d io n, in p o r t
An i d etect r k su
p
etwo
lli sion e n s an
d
Co gam shap
e
nt PIs (
• Simulator (instant Ope nFei
d ra w ing
A
, etc.)
,
ctor oard a512
refresh)
Ve
I (keyb a 1, s h
ve U 5, sh
Nati , md MP3)
(md4 ts o r
C r ypto d effec n l i b ra
(so un
n sitio
A u d io n d t ra b rarie
s
• Cloud services
io n a er li
A n i ma
t
d Tw itt y ha
n
ok a
n emor
F aceb
o
t ure m
d tex tion
Imp ro ve a
c s im u l
s anscamobile.com y i brar
p hysi oto l

17. Small Code Size
1.4 MB
Footprint
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18. Develop 5-10x faster
“Angry Birds” “Fruit Ninja” “Tiny Wings”
36 hours
14 hours
12 hours
code+graphics code+graphics code+graphics
+sound
+sound
+sound
(complete 2 level (gameplay only) (gameplay only)
“Developing directly in Xcode would have
been at least 5x more code than Corona”
– Unicorn Labs, Top 20 iPad eBook
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19. • build.settings (ie manifest settings, permissions, etc)
• config.lua. (Corona instructions)
• Main.lua
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20. anscamobile.com

21. anscamobile.com

22. Hard Problems
Made Easy
(i.e., how Corona will teach you
to love physics)
anscamobile.com

23. Phone SDK.
OpenGL in one line [EAGLContext setCurrentContext:context];
[aContext release];
// Display "myImage.png"
// Create default framebuffer object.
[(EAGLView *)self.view setContext:context];
// ----------------------------------------------------------------------------
glGenFramebuffers(1, &defaultFramebuffer);
[(EAGLView *)self.view setFramebuffer];
// OpenGLESTextureAppDelegate.m
glBindFramebuffer(GL_FRAMEBUFFER, defaultFramebuffer);
// ----------------------------------------------------------------------------
[self loadTexture];
// Create color render buffer and allocate backing store.
#import "OpenGLESTextureAppDelegate.h"
glGenRenderbuffers(1, &colorRenderbuffer);
self.displayLink = nil;
#import "EAGLView.h"
glBindRenderbuffer(GL_RENDERBUFFER, colorRenderbuffer);
}
#import "OpenGLESTextureViewController.h"
[context renderbufferStorage:GL_RENDERBUFFER fromDrawable:(CAEAGLLayer
*)self.layer];
- (void) loadTexture
@implementation OpenGLESTextureAppDelegate
glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_WIDTH, {
&framebufferWidth);
glEnable(GL_TEXTURE_2D);
@synthesize window=_window;
glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_HEIGHT, glEnable(GL_BLEND);
&framebufferHeight);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
@synthesize viewController=_viewController;
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER,
glGenTextures(1, &textureID);
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions: colorRenderbuffer);
glBindTexture(GL_TEXTURE_2D, textureID);
(NSDictionary *)launchOptions
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);
{
if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);
// Override point for customization after application launch.
NSLog(@"Failed to make complete framebuffer object %x",
self.window.rootViewController = self.viewController;
glCheckFramebufferStatus(GL_FRAMEBUFFER));
NSString *path = [[NSBundle mainBundle] pathForResource:@"myImage" ofType:@"png"];
return YES;
}
NSData *texData = [[NSData alloc] initWithContentsOfFile:path];
}
}
UIImage *image = [[UIImage alloc] initWithData:texData];
- (void)applicationDidBecomeActive:(UIApplication *)application
- (void)deleteFramebuffer
GLuint width = CGImageGetWidth(image.CGImage);
{
{
GLuint height = CGImageGetHeight(image.CGImage);
/*
if (context) {
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
Restart any tasks that were paused (or not yet started) while the application was [EAGLContext setCurrentContext:context];
void *imageData = malloc( height width 4 );
inactive. If the application was previously in the background, optionally refresh the user
CGContextRef image_context = CGBitmapContextCreate( imageData, width, height, 8, 4
interface.
if (defaultFramebuffer) {
width, colorSpace, kCGImageAlphaPremultipliedLast | kCGBitmapByteOrder32Big );
*/
glDeleteFramebuffers(1, &defaultFramebuffer);
CGColorSpaceRelease( colorSpace );
[self.viewController drawFrame];
defaultFramebuffer = 0;
CGContextClearRect( image_context, CGRectMake( 0, 0, width, height ) );
}
}
CGContextTranslateCTM( image_context, 0, height - height );
CGContextDrawImage( image_context, CGRectMake( 0, 0, width, height ), image.CGImage );
- (void)dealloc
if (colorRenderbuffer) {
{
glDeleteRenderbuffers(1, &colorRenderbuffer);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE,
[_window release];
colorRenderbuffer = 0;
imageData);
[_viewController release];
}
[super dealloc];
}
CGContextRelease(image_context);
}
}
free(imageData);
@end
- (void)setFramebuffer
[image release];
{
[texData release];
display.newImage("myImage.png")
if (context) {
// ----------------------------------------------------------------------------
[EAGLContext setCurrentContext:context];
}
// EAGLView.m
// ----------------------------------------------------------------------------
if (!defaultFramebuffer)
- (void)dealloc
[self createFramebuffer];
{
#import <QuartzCore/QuartzCore.h>
glDeleteTextures(1, &textureID);
#import "EAGLView.h"
glBindFramebuffer(GL_FRAMEBUFFER, defaultFramebuffer);
// Tear down context.
@interface EAGLView (PrivateMethods)
glViewport(0, 0, framebufferWidth, framebufferHeight);
if ([EAGLContext currentContext] == context)
- (void)createFramebuffer;
}
[EAGLContext setCurrentContext:nil];
- (void)deleteFramebuffer;
}
@end
[context release];
- (BOOL)presentFramebuffer
@implementation EAGLView
{
[super dealloc];
BOOL success = FALSE;
}
@synthesize context;
if (context) {
- (void)viewDidUnload
// You must implement this method
[EAGLContext setCurrentContext:context];
{
+ (Class)layerClass
[super viewDidUnload];
{
glBindRenderbuffer(GL_RENDERBUFFER, colorRenderbuffer);
return [CAEAGLLayer class];
// Tear down context.
}
success = [context presentRenderbuffer:GL_RENDERBUFFER];
if ([EAGLContext currentContext] == context)
}
[EAGLContext setCurrentContext:nil];
//The EAGL view is stored in the nib file. When it's unarchived it's sent -initWithCoder:.
self.context = nil;
- (id)initWithCoder:(NSCoder*)coder
return success;
}
{
}
self = [super initWithCoder:coder];
- (void)drawFrame
if (self) {
- (void)layoutSubviews
{
CAEAGLLayer *eaglLayer = (CAEAGLLayer *)self.layer;
{
[(EAGLView *)self.view setFramebuffer];
// The framebuffer will be re-created at the beginning of the next setFramebuffer
eaglLayer.opaque = TRUE;
method call.
// Replace the implementation of this method to do your own custom drawing.
eaglLayer.drawableProperties = [NSDictionary dictionaryWithObjectsAndKeys:
[self deleteFramebuffer];
static const GLfloat squareVertices[] = {
[NSNumber numberWithBool:FALSE], }
-0.5f, -0.33f,
kEAGLDrawablePropertyRetainedBacking,
0.5f, -0.33f,
kEAGLColorFormatRGBA8, @end
-0.5f, 0.33f,
kEAGLDrawablePropertyColorFormat,
0.5f, 0.33f,
nil];
};
}
// ----------------------------------------------------------------------------
// OpenGLESTextureViewController.m
static const GLfloat texCoords[] = {
return self;
// ----------------------------------------------------------------------------
0.0, 1.0,
}
1.0, 1.0,
#import <QuartzCore/QuartzCore.h>
0.0, 0.0,
- (void)dealloc
#import "OpenGLESTextureViewController.h"
1.0, 0.0
{
#import "EAGLView.h"
};
[self deleteFramebuffer];
[context release];
@interface OpenGLESTextureViewController ()
@property (nonatomic, retain) EAGLContext *context;
glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
[super dealloc];
@property (nonatomic, assign) CADisplayLink *displayLink;
glClear(GL_COLOR_BUFFER_BIT);
}
- (void) loadTexture;
@end
glMatrixMode(GL_PROJECTION);
- (void)setContext:(EAGLContext *)newContext
glLoadIdentity();
{
@implementation OpenGLESTextureViewController
glMatrixMode(GL_MODELVIEW);
if (context != newContext) {
glLoadIdentity();
[self deleteFramebuffer];
@synthesize animating, context, displayLink;
glVertexPointer(2, GL_FLOAT, 0, squareVertices);
[context release];
- (void)awakeFromNib
glEnableClientState(GL_VERTEX_ARRAY);
context = [newContext retain];
{
glTexCoordPointer(2, GL_FLOAT, 0, texCoords);
EAGLContext *aContext = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES1];
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
[EAGLContext setCurrentContext:nil];
}
if (!aContext)
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
}
NSLog(@"Failed to create ES context");
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else if (![EAGLContext setCurrentContext:aContext])
[(EAGLView *)self.view presentFramebuffer];
- (void)createFramebuffer
NSLog(@"Failed to set ES context current");
}
{
if (context && !defaultFramebuffer) {
self.context = aContext;
@end

24. local sky = display.newImage( "clouds.png" )
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25. anscamobile.com

26. local sky = display.newImage( "clouds.png" )
local ground = display.newImage( "ground.png" )
ground.x = 160
ground.y = 445
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27. anscamobile.com

28. local sky = display.newImage( "clouds.png" )
local ground = display.newImage( "ground.png" )
ground.x = 160
ground.y = 445
local crate = display.newImage( "crate.png" )
crate.x = 180
crate.y = 80
crate.rotation = 10
anscamobile.com

29. anscamobile.com

30. local physics = require( "physics" )
physics.start()
local sky = display.newImage( "clouds.png" )
local ground = display.newImage( "ground.png" )
ground.x = 160
ground.y = 445
local crate = display.newImage( "crate.png" )
crate.x = 180
crate.y = 80
crate.rotation = 10
anscamobile.com

31. local physics = require( "physics" )
physics.start()
local sky = display.newImage( "clouds.png" )
local ground = display.newImage( "ground.png" )
ground.x = 160
ground.y = 445
physics.addBody( ground, { friction=0.5 } )
ground.bodyType = "static"
local crate = display.newImage( "crate.png" )
crate.x = 180
crate.y = 80
crate.rotation = 10
anscamobile.com

32. local physics = require( "physics" )
physics.start()
local sky = display.newImage( "clouds.png" )
local ground = display.newImage( "ground.png" )
ground.x = 160
ground.y = 445
physics.addBody( ground, { friction=0.5 } )
ground.bodyType = "static"
local crate = display.newImage( "crate.png" )
crate.x = 180
crate.y = 80
crate.rotation = 10
physics.addBody( crate, { density=2.0,
friction=0.5, bounce=0.3 } )
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33. anscamobile.com

34. What if we want
lots of crates?
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35. local crate = display.newImage( "crate.png" )
crate.x = 180
crate.y = -100
crate.rotation = 10
physics.addBody( crate, { density=2.0,
friction=0.5, bounce=0.3 } )
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36. local function spawnCrate()
local crate = display.newImage( "crate.png" )
crate.x = math.random( 320 )
crate.y = -100
crate.rotation = 10
physics.addBody( crate, { density=2.0,
friction=0.5, bounce=0.3 } )
end
timer.performWithDelay( 500, spawnCrate, 50 )
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37. anscamobile.com

38. What if gravity was up
rather than down?
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39. physics.setGravity( 0, 9.8 )
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40. physics.setGravity( 0, -9.8 )
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41. anscamobile.com

42. Take a Look at
“Corona is a ‘godsend’. My game runs at 1 fps (frame/sec)
in Flash but runs in full 30 fps in Corona.”
– Jeff Fulton, Flash Developer
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43. • Test early and test often, ESPECIALLY ON A DEVICE
(or 20)
• Take time to understand dynamic image resolution
• Know what settings to include in your build.settings
file (think manifest)
• Know the limitations of the API you are using BEFORE
you start a project.
• MEMORY Matters in mobile, when is the last time you
even thought about it????
• Share what you learn!
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44. What Questions do you
have?
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45. www.fullycroisened.com
www.coronalabs.com
www.techority.com
www.learningcorona.com
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