CoreGraphics

Functions
function	CGBitmapGraphicsContextCreate ()
function	CGContextAddArc (aContext, x, y, radius, startAngle, endAngle, clockwise)
function	CGContextAddArcToPoint (aContext, x1, y1, x2, y2, radius)
function	CGContextAddCurveToPoint (aContext, cp1x, cp1y, cp2x, cp2y, x, y)
function	CGContextAddEllipseInRect (aContext, aRect)
function	CGContextAddLines (aContext, points, count)
function	CGContextAddLineToPoint (aContext, x, y)
function	CGContextAddPath (aContext, aPath)
function	CGContextAddQuadCurveToPoint (aContext, cpx, cpy, x, y)
function	CGContextAddRect (aContext, aRect)
function	CGContextAddRects (aContext, rects, count)
function	CGContextBeginPath (aContext)
function	CGContextClosePath (aContext)
function	CGContextConcatCTM (aContext, aTransform)
function	CGContextEOFillPath (aContext)
function	CGContextFillEllipseInRect (aContext, aRect)
function	CGContextFillPath (aContext)
function	CGContextFillRect (aContext, aRect)
function	CGContextFillRects (aContext, rects, count)
function	CGContextFillRoundedRectangleInRect (aContext, aRect, aRadius, ne, se, sw, nw)
function	CGContextGetCTM (aContext)
function	CGContextIsPathEmpty (aContext)
function	CGContextMoveToPoint (aContext, x, y)
function	CGContextRelease ()
function	CGContextRestoreGState (aContext)
function	CGContextRetain (aContext)
function	CGContextRotateCTM (aContext, anAngle)
function	CGContextSaveGState (aContext)
function	CGContextScaleCTM (aContext, sx, sy)
function	CGContextSetAlpha (aContext, anAlpha)
function	CGContextSetBlendMode (aContext, aBlendMode)
function	CGContextSetFillColor (aContext, aColor)
function	CGContextSetLineCap (aContext, aLineCap)
function	CGContextSetLineJoin (aContext, aLineJoin)
function	CGContextSetLineWidth (aContext, aLineWidth)
function	CGContextSetMiterLimit (aContext, aMiterLimit)
function	CGContextSetShadow (aContext, aSize, aBlur)
function	CGContextSetShadowWithColor (aContext, aSize, aBlur, aColor)
function	CGContextSetStrokeColor (aContext, aColor)
function	CGContextStrokeEllipseInRect (aContext, aRect)
function	CGContextStrokeLineSegments (aContext, points, count)
function	CGContextStrokePath (aContext)
function	CGContextStrokeRect (aContext, aRect)
function	CGContextStrokeRectWithWidth (aContext, aRect, aWidth)
function	CGContextStrokeRoundedRectangleInRect (aContext, aRect, aRadius, ne, se, sw, nw)
function	CGContextTranslateCTM (aContext, tx, ty)
function	CGGStateCreate ()
function	CGGStateCreateCopy (aGState)
function	CGPathAddArc (aPath, aTransform, x, y, aRadius, aStartAngle, anEndAngle, isClockwise)
function	CGPathAddArcToPoint (aPath, aTransform, x1, y1, x2, y2, aRadius)
function	CGPathAddCurveToPoint (aPath, aTransform, cp1x, cp1y, cp2x, cp2y, x, y)
function	CGPathAddLines (aPath, aTransform, points, count)
function	CGPathAddLineToPoint (aPath, aTransform, x, y)
function	CGPathAddPath (aPath, aTransform, anotherPath)
function	CGPathAddQuadCurveToPoint (aPath, aTransform, cpx, cpy, x, y)
function	CGPathAddRect (aPath, aTransform, aRect)
function	CGPathAddRects (aPath, aTransform, rects, count)
function	CGPathCloseSubpath (aPath)
function	CGPathCreateCopy (aPath)
function	CGPathCreateMutable ()
function	CGPathCreateMutableCopy (aPath)
function	CGPathEqualToPath (aPath, anotherPath)
function	CGPathGetBoundingBox (aPath)
function	CGPathGetCurrentPoint (aPath)
function	CGPathIsEmpty (aPath)
function	CGPathMoveToPoint (aPath, aTransform, x, y)
function	CGPathRelease (aPath)
function	CGPathRetain (aPath)
function	CGPathWithEllipseInRect (aRect)
function	CGPathWithRoundedRectangleInRect (aRect, xRadius, yRadius, ne, se, sw, nw)

Variables
var	KAPPA = 4.0 * ((SQRT2 - 1.0) / 3.0)
var	KAPPA = 4.0 * ((SQRT2 - 1.0) / 3.0)

Detailed Description

Function Documentation

function CGBitmapGraphicsContextCreate

(

)

Returns a new graphics context.

Returns

CGContext a new graphics context which can be drawn into

Definition at line 135 of file CGContext.j.

function CGContextAddArc	(	aContext	,
		x	,
		y	,
		radius	,
		startAngle	,
		endAngle	,
		clockwise
	)

Definition at line 185 of file CGContext.j.

function CGContextAddArcToPoint	(	aContext	,
		x1	,
		y1	,
		x2	,
		y2	,
		radius
	)

Adds an arc to the current context that ends in the specified point.

Parameters

aContext	the CGContext to edit
x1	the x coordinate of the beginning of the arc
y1	the y coordinate of the beginning of the arc
x2	the x coordinate of the end of the arc
y2	the y coordinate of the end of the arc
radius	the radius of the arc to be drawn

Returns

void

Definition at line 200 of file CGContext.j.

function CGContextAddCurveToPoint	(	aContext	,
		cp1x	,
		cp1y	,
		cp2x	,
		cp2y	,
		x	,
		y
	)

Adds a cubic curve to the current context

Parameters

aContext	the CGContext to edit
cp1x	the x coordinate of the first control point
cp1y	the y coordinate of the first control point
cp2x	the x coordinate of the second control point
cp2y	the y coordinate of the second control point
x	the x coordinate of the end of the curve
y	the y coordinate of the end of the curve

Returns

void

Definition at line 216 of file CGContext.j.

function CGContextAddEllipseInRect	(	aContext	,
		aRect
	)

Draws the outline of an ellipse bounded by a rectangle.

Parameters

aContext	CGContext to draw on
aRect	the rectangle bounding the ellipse

Returns

void

Definition at line 555 of file CGContext.j.

function CGContextAddLines	(	aContext	,
		points	,
		count
	)

Adds a line to each element in the points array

Parameters

aContext	the CGContext to move
points	an array of points that are to be consecutively executed as if they were individual addToPoint calls
count	an upper bound on the number of points to use

Returns

void

Definition at line 228 of file CGContext.j.

function CGContextAddLineToPoint	(	aContext	,
		x	,
		y
	)

Adds a line from the current point to the x/y

Parameters

aContext	the CGContext to move
x	the x coordinate of the end point of the line
y	the y coordinate of the end point of the line

Returns

void

Definition at line 240 of file CGContext.j.

function CGContextAddPath	(	aContext	,
		aPath
	)

Adds aPath to the current path in aContext

Parameters

aContext	the CGContext to add to
aPath	the path to be added

Returns

void

Definition at line 251 of file CGContext.j.

function CGContextAddQuadCurveToPoint	(	aContext	,
		cpx	,
		cpy	,
		x	,
		y
	)

Adds a quadratic curve from the current point to the point specified by x/y, using the control point specified by cpx/cpy

Parameters

aContext	the CGContext to add the curve to
cpx	the x coordinate for the curve's control point
cpy	the y coordinate for the curve's control point
x	the x coordinate for the end point of the curve
y	the y coordinate for the end point of the curve

Returns

void

Definition at line 271 of file CGContext.j.

function CGContextAddRect	(	aContext	,
		aRect
	)

Adds aRect to the current path in the given context

Parameters

aContext	the CGContext to add to
aRect	the dimensions of the rectangle to add

Returns

void

Definition at line 282 of file CGContext.j.

function CGContextAddRects	(	aContext	,
		rects	,
		count
	)

Adds up to count elements from rects to the current path in aContext

Parameters

aContext	the CGContext to add to
rects	an array of CGRects to be added to the context's path
the	upper bound of elements to be added

Returns

void

Definition at line 294 of file CGContext.j.

function CGContextBeginPath

(

aContext

)

Begins a new subpath in the given context

Parameters

aContext

the CGContext to create a new path in

Returns

void

Definition at line 304 of file CGContext.j.

function CGContextClosePath

(

aContext

)

Closes the currently open subpath, if any, in aContext

Parameters

aContext

the CGContext to close a path in

Returns

void

Definition at line 315 of file CGContext.j.

function CGContextConcatCTM	(	aContext	,
		aTransform
	)

Concatenates the given transformation matrix onto the current transformation matrix in aContext

Parameters

aContext	the CGContext to transform
aTransform	the CGAffineTransform to apply to the given context

Returns

void

Definition at line 413 of file CGContext.j.

function CGContextEOFillPath

(

aContext

)

Fills in the area of the current path, using the even-odd fill rule.

Parameters

aContext

the CGContext of the path

Returns

void

Definition at line 531 of file CGContext.j.

function CGContextFillEllipseInRect	(	aContext	,
		aRect
	)

Fills an ellipse bounded by a rectangle.

Parameters

aContext	CGContext to draw on
aRect	the rectangle bounding the ellipse

Returns

void

Definition at line 568 of file CGContext.j.

function CGContextFillPath

(

aContext

)

Fills in the area of the current path, using the non-zero winding number rule.

Parameters

aContext

the CGContext of the path

Returns

void

Definition at line 541 of file CGContext.j.

function CGContextFillRect	(	aContext	,
		aRect
	)

Fills a rectangle in the given context with aRect dimensions, using the context's current fill color

Parameters

aContext	the CGContext to draw into
aRect	the dimensions of the rectangle to fill

Returns

void

Definition at line 351 of file CGContext.j.

function CGContextFillRects	(	aContext	,
		rects	,
		count
	)

Fills a rectangle in the given context for each CGRect in the given array, up to a total of count rects

Parameters

aContext	the CGContext to draw into
rects	an array of rects to fill
count	the maximum number of rects from the given array to fill

Returns

void

Definition at line 363 of file CGContext.j.

function CGContextFillRoundedRectangleInRect	(	aContext	,
		aRect	,
		aRadius	,
		ne	,
		se	,
		sw	,
		nw
	)

Fills a rounded rectangle.

Parameters

aContext	the CGContext to draw into
aRect	the base rectangle
aRadius	the distance from the rectangle corner to the rounded corner
ne	set it to YES for a rounded northeast corner
se	set it to YES for a rounded southeast corner
sw	set it to YES for a rounded southwest corner
nw	set it to YES for a rounded northwest corner

Returns

void

Definition at line 668 of file CGContext.j.

function CGContextGetCTM

(

aContext

)

Returns the current transformation matrix for the given context

Parameters

aContext

the CGContext for which we are asking for the transform

Returns

CGAffineTransform the current transformation matrix of the given context

Definition at line 425 of file CGContext.j.

function CGContextIsPathEmpty

(

aContext

)

Return YES if the current path in the given context is empty.

Parameters

aContext

the CGContext to examine

Returns

BOOL

Definition at line 325 of file CGContext.j.

function CGContextMoveToPoint	(	aContext	,
		x	,
		y
	)

Moves the current location of aContext to the given x and y coordinates

Parameters

aContext	the CGContext to move
x	the x location to move the context to
y	the y location to move the context to

Returns

void

Definition at line 337 of file CGContext.j.

function CGContextRelease

(

)

This function is just here for source compatibility. It does nothing. CGContext

Definition at line 82 of file CGContext.j.

function CGContextRestoreGState

(

aContext

)

Pops the most recent graphics state of the top of the graphics stack and restores it.

Parameters

aContext

the CGContext to edit

Returns

void

Definition at line 155 of file CGContext.j.

function CGContextRetain

(

aContext

)

This function is just here for source compatibility. It does nothing.

Parameters

aContext

a CGContext

Returns

CGContext the context

Definition at line 92 of file CGContext.j.

function CGContextRotateCTM	(	aContext	,
		anAngle
	)

Rotates the current context by anAngle radians

Parameters

aContext	the CGContext to rotate
anAngle	the amount to rotate, in radians

Returns

void

Definition at line 437 of file CGContext.j.

function CGContextSaveGState

(

aContext

)

Pushes the current graphics state of aContext onto the top of a stack.

Parameters

aContext

the CGContext to edit

Returns

void

Definition at line 145 of file CGContext.j.

function CGContextScaleCTM	(	aContext	,
		sx	,
		sy
	)

Scales the current context by sx/sy

Parameters

aContext	the CGContext to scale
sx	the amount to scale in the x direction
sy	the amount to scale in the y direction

Returns

void

Definition at line 451 of file CGContext.j.

function CGContextSetAlpha	(	aContext	,
		anAlpha
	)

Sets the current alpha value for core graphics drawing operations in the given context .

Parameters

aContext	the CGContext who's alpha value should be updated
anAlpha	the new alpha value. 1.0 is completely opaque, 0.0 is completely transparent.

Returns

void

Definition at line 512 of file CGContext.j.

function CGContextSetBlendMode	(	aContext	,
		aBlendMode
	)

Definition at line 180 of file CGContext.j.

function CGContextSetFillColor	(	aContext	,
		aColor
	)

Sets the current fill color.

Parameters

aContext	the CGContext
aColor	the new color for the fill

Returns

void

Definition at line 639 of file CGContext.j.

function CGContextSetLineCap	(	aContext	,
		aLineCap
	)

Definition at line 160 of file CGContext.j.

function CGContextSetLineJoin	(	aContext	,
		aLineJoin
	)

Definition at line 165 of file CGContext.j.

function CGContextSetLineWidth	(	aContext	,
		aLineWidth
	)

Definition at line 170 of file CGContext.j.

function CGContextSetMiterLimit	(	aContext	,
		aMiterLimit
	)

Definition at line 175 of file CGContext.j.

function CGContextSetShadow	(	aContext	,
		aSize	,
		aBlur
	)

Sets the current offset, and blur for shadows in core graphics drawing operations

Parameters

aContext	the CGContext of the shadow
aSize	a CGSize indicating the offset of the shadow
aBlur	a float indicating the blur radius

Returns

void

Definition at line 480 of file CGContext.j.

function CGContextSetShadowWithColor	(	aContext	,
		aSize	,
		aBlur	,
		aColor
	)

Sets the current offset, blur, and color for shadows in core graphics drawing operations

Parameters

aContext	the CGContext of the shadow
aSize	a CGSize indicating the offset of the shadow
aBlur	a float indicating the blur radius
aColor	a CPColor object indicating the color of the shadow

Returns

void

Definition at line 497 of file CGContext.j.

function CGContextSetStrokeColor	(	aContext	,
		aColor
	)

Sets the current stroke color.

Parameters

aContext	the CGContext
aColor	the new color for the stroke

Returns

void

Definition at line 651 of file CGContext.j.

function CGContextStrokeEllipseInRect	(	aContext	,
		aRect
	)

Strokes an ellipse bounded by the specified rectangle.

Parameters

aContext	CGContext to draw on
aRect	the rectangle bounding the ellipse

Returns

void

Definition at line 582 of file CGContext.j.

function CGContextStrokeLineSegments	(	aContext	,
		points	,
		count
	)

Strokes multiple line segments.

Parameters

aContext	CGContext to draw on
points	an array with an even number of points. The first point is the beginning of the first line segment, the second is the end of the first line segment. The third point is the beginning of second line segment, etc.
count	the number of points in the array

Returns

void

Definition at line 611 of file CGContext.j.

function CGContextStrokePath

(

aContext

)

Paints a line in the current path of the current context.

Parameters

aContext

CGContext to draw on

Returns

void

Definition at line 595 of file CGContext.j.

function CGContextStrokeRect	(	aContext	,
		aRect
	)

Strokes a rectangle with the given location into the given context, using the context's current width and color

Parameters

aContext	the CGContext to draw into
aRect	a CGRect indicating the dimensions of the rectangle to be drawn

Returns

void

Definition at line 381 of file CGContext.j.

function CGContextStrokeRectWithWidth	(	aContext	,
		aRect	,
		aWidth
	)

Strokes a rectangle with the given dimensions and the given stroke width

Parameters

aContext	the CGContext to draw into
aRect	the CGRect indicating the bounds of the rect to be drawn
aWidth	the width with which to stroke the rect

Returns

void

Definition at line 397 of file CGContext.j.

function CGContextStrokeRoundedRectangleInRect	(	aContext	,
		aRect	,
		aRadius	,
		ne	,
		se	,
		sw	,
		nw
	)

Strokes a rounded rectangle.

Parameters

aContext	the CGContext to draw into
aRect	the base rectangle
aRadius	the distance from the rectangle corner to the rounded corner
ne	set it to YES for a rounded northeast corner
se	set it to YES for a rounded southeast corner
sw	set it to YES for a rounded southwest corner
nw	set it to YES for a rounded northwest corner

Returns

void

Definition at line 687 of file CGContext.j.

function CGContextTranslateCTM	(	aContext	,
		tx	,
		ty
	)

Translates the given context by tx in the x direction and ty in the y direction

Parameters

aContext	the CGContext to translate
tx	the amount to move in the x direction
ty	the amount to move in the y direction

Returns

void

Definition at line 465 of file CGContext.j.

function CGGStateCreate

(

)

Creates a new graphics state, which describes all the current values for drawing.

Returns

a graphics state

Definition at line 111 of file CGContext.j.

function CGGStateCreateCopy

(

aGState

)

Creates a copy of the given graphics state.

Parameters

aGState

the graphics state to copy

Returns

a copy of the given graphics state

Definition at line 123 of file CGContext.j.

function CGPathAddArc	(	aPath	,
		aTransform	,
		x	,
		y	,
		aRadius	,
		aStartAngle	,
		anEndAngle	,
		isClockwise
	)

Definition at line 78 of file CGPath.j.

function CGPathAddArcToPoint	(	aPath	,
		aTransform	,
		x1	,
		y1	,
		x2	,
		y2	,
		aRadius
	)

Definition at line 117 of file CGPath.j.

function CGPathAddCurveToPoint	(	aPath	,
		aTransform	,
		cp1x	,
		cp1y	,
		cp2x	,
		cp2y	,
		x	,
		y
	)

Definition at line 132 of file CGPath.j.

function CGPathAddLines	(	aPath	,
		aTransform	,
		points	,
		count
	)

Definition at line 149 of file CGPath.j.

function CGPathAddLineToPoint	(	aPath	,
		aTransform	,
		x	,
		y
	)

Definition at line 165 of file CGPath.j.

function CGPathAddPath	(	aPath	,
		aTransform	,
		anotherPath
	)

Definition at line 176 of file CGPath.j.

function CGPathAddQuadCurveToPoint	(	aPath	,
		aTransform	,
		cpx	,
		cpy	,
		x	,
		y
	)

Definition at line 218 of file CGPath.j.

function CGPathAddRect	(	aPath	,
		aTransform	,
		aRect
	)

Definition at line 233 of file CGPath.j.

function CGPathAddRects	(	aPath	,
		aTransform	,
		rects	,
		count
	)

Definition at line 238 of file CGPath.j.

function CGPathCloseSubpath

(

aPath

)

Definition at line 353 of file CGPath.j.

function CGPathCreateCopy

(

aPath

)

Returns a copy of the given path object.

Definition at line 64 of file CGPath.j.

function CGPathCreateMutable

(

)

Returns a new CGPath object.

Definition at line 42 of file CGPath.j.

function CGPathCreateMutableCopy

(

aPath

)

Returns a copy of the given path object.

Definition at line 51 of file CGPath.j.

function CGPathEqualToPath	(	aPath	,
		anotherPath
	)

Definition at line 364 of file CGPath.j.

function CGPathGetBoundingBox

(

aPath

)

Calculate the smallest rectangle to contain both the path of the receiver and all control points.

Definition at line 410 of file CGPath.j.

function CGPathGetCurrentPoint

(

aPath

)

Definition at line 397 of file CGPath.j.

function CGPathIsEmpty

(

aPath

)

Definition at line 402 of file CGPath.j.

function CGPathMoveToPoint	(	aPath	,
		aTransform	,
		x	,
		y
	)

Definition at line 258 of file CGPath.j.

function CGPathRelease

(

aPath

)

Definition at line 69 of file CGPath.j.

function CGPathRetain

(

aPath

)

Definition at line 73 of file CGPath.j.

function CGPathWithEllipseInRect

(

aRect

)

Definition at line 282 of file CGPath.j.

function CGPathWithRoundedRectangleInRect	(	aRect	,
		xRadius	,
		yRadius	,
		ne	,
		se	,
		sw	,
		nw
	)

Definition at line 306 of file CGPath.j.

Variable Documentation

var KAPPA = 4.0 * ((SQRT2 - 1.0) / 3.0)

Definition at line 280 of file CGPath.j.

var KAPPA = 4.0 * ((SQRT2 - 1.0) / 3.0)

Definition at line 547 of file CGContext.j.