kanvas/com.juul.krayon.kanvas/CGContextKanvas

CGContextKanvas

class CGContextKanvas(unmanagedContext: CGContextRef, width: Double, height: Double) : Kanvas

It is the calling code's responsibility to ensure that unmanagedContext outlives this object.

Constructors

CGContextKanvas

constructor(unmanagedContext: CGContextRef, width: Double, height: Double)

When calling from Swift, pass Unmanaged.passUnretained/passRetained(yourCgContext)

constructor(ptr: CPointerVarOf<CGContextRef>, width: Double, height: Double)

When calling from Swift, use &yourCgContext.

Properties

height

open override val height: Float

Gets the height of the canvas.

width

open override val width: Float

Gets the width of the canvas.

Functions

drawArc

open override fun drawArc(left: Float, top: Float, right: Float, bottom: Float, startAngle: Float, sweepAngle: Float, paint: Paint)

Draw an arc that fits in the oval defined by the rectangle left, top, right, and bottom, from startAngle (in degrees, with 0 at the right) to startAngle + sweepAngle.

drawCircle

open override fun drawCircle(centerX: Float, centerY: Float, radius: Float, paint: Paint)

Draw a circle at centerX, centerY with size defined by its radius.

drawColor

open override fun drawColor(color: Color)

Draw a color over the entire canvas. Implementations may or may not restrict this to the current clip.

drawLine

open override fun drawLine(startX: Float, startY: Float, endX: Float, endY: Float, paint: Paint)

Draw a line from startX, startY to endX, endY.

drawOval

open override fun drawOval(left: Float, top: Float, right: Float, bottom: Float, paint: Paint)

Draw an oval defined by the rectangle left, top, right, and bottom.

drawPath

open override fun drawPath(path: Path, paint: Paint)

Draws a Path.

drawRect

open override fun drawRect(left: Float, top: Float, right: Float, bottom: Float, paint: Paint)

Draws the rectangle left, top, right, bottom.

drawText

open override fun drawText(text: CharSequence, x: Float, y: Float, paint: Paint)

Draws a string of text at x, y. Exact horizontal behavior is controlled by the paint's alignment.

pop

open override fun pop()

Removes the last pushClip or pushTransform operation.

pushClip

open override fun pushClip(clip: Clip)

Pushes a clip to the canvas. Remove it with pop.

pushTransform

open override fun pushTransform(transform: Transform)

Pushes a transform to the canvas. Remove it with pop.

withClip

inline fun Kanvas.withClip(clip: Clip, actions: Kanvas.() -> Unit)

Invokes actions inside of a Kanvas.pushClip/Kanvas.pop pair.

withTransform

inline fun Kanvas.withTransform(transform: Transform, actions: Kanvas.() -> Unit)

Invokes actions inside of a Kanvas.pushTransform/Kanvas.pop pair.