OffscreenCanvasRenderingContext2D#

Annotations: @Native.new("OffscreenCanvasRenderingContext2D")

Properties#

canvas no setter#

OffscreenCanvas? get canvas native;

direction read / write#

String? get direction native;

set direction(String? value) native;

fillStyle read / write#

Object? get fillStyle native;

set fillStyle(Object? value) native;

filter read / write#

String? get filter native;

set filter(String? value) native;

font read / write#

String? get font native;

set font(String? value) native;

globalAlpha read / write#

num? get globalAlpha native;

set globalAlpha(num? value) native;

globalCompositeOperation read / write#

String? get globalCompositeOperation native;

set globalCompositeOperation(String? value) native;

hashCode no setter inherited#

Inherited from Interceptor.

int get hashCode => Primitives.objectHashCode(this);

imageSmoothingEnabled read / write#

bool? get imageSmoothingEnabled native;

set imageSmoothingEnabled(bool? value) native;

imageSmoothingQuality read / write#

String? get imageSmoothingQuality native;

set imageSmoothingQuality(String? value) native;

lineCap read / write#

String? get lineCap native;

set lineCap(String? value) native;

lineDashOffset read / write#

num? get lineDashOffset native;

set lineDashOffset(num? value) native;

lineJoin read / write#

String? get lineJoin native;

set lineJoin(String? value) native;

lineWidth read / write#

num? get lineWidth native;

set lineWidth(num? value) native;

miterLimit read / write#

num? get miterLimit native;

set miterLimit(num? value) native;

runtimeType no setter inherited#

Inherited from Interceptor.

Type get runtimeType =>
    getRuntimeTypeOfInterceptorNotArray(getInterceptor(this), this);

shadowBlur read / write#

num? get shadowBlur native;

set shadowBlur(num? value) native;

shadowColor read / write#

String? get shadowColor native;

set shadowColor(String? value) native;

shadowOffsetX read / write#

num? get shadowOffsetX native;

set shadowOffsetX(num? value) native;

shadowOffsetY read / write#

num? get shadowOffsetY native;

set shadowOffsetY(num? value) native;

strokeStyle read / write#

Object? get strokeStyle native;

set strokeStyle(Object? value) native;

textAlign read / write#

String? get textAlign native;

set textAlign(String? value) native;

textBaseline read / write#

String? get textBaseline native;

set textBaseline(String? value) native;

Methods#

arc()#

void arc(
  num x,
  num y,
  num radius,
  num startAngle,
  num endAngle,
  bool? anticlockwise,
) native;

arcTo()#

void arcTo(num x1, num y1, num x2, num y2, num radius) native;

beginPath()#

void beginPath() native;

bezierCurveTo()#

void bezierCurveTo(
  num cp1x,
  num cp1y,
  num cp2x,
  num cp2y,
  num x,
  num y,
) native;

clearRect()#

void clearRect(num x, num y, num width, num height) native;

clip()#

void clip([Path2D? path]) native;

closePath()#

void closePath() native;

commit()#

Future commit() => promiseToFuture(JS("", "#.commit()", this));

createImageData()#

ImageData createImageData(
  data_OR_imagedata_OR_sw, [
  int? sh_OR_sw,
  imageDataColorSettings_OR_sh,
  Map? imageDataColorSettings,
]) {
  if ((data_OR_imagedata_OR_sw is ImageData) &&
      sh_OR_sw == null &&
      imageDataColorSettings_OR_sh == null &&
      imageDataColorSettings == null) {
    var imagedata_1 = convertDartToNative_ImageData(data_OR_imagedata_OR_sw);
    return convertNativeToDart_ImageData(_createImageData_1(imagedata_1));
  }
  if (sh_OR_sw != null &&
      (data_OR_imagedata_OR_sw is int) &&
      imageDataColorSettings_OR_sh == null &&
      imageDataColorSettings == null) {
    return convertNativeToDart_ImageData(
      _createImageData_2(data_OR_imagedata_OR_sw, sh_OR_sw),
    );
  }
  if ((imageDataColorSettings_OR_sh is Map) &&
      sh_OR_sw != null &&
      (data_OR_imagedata_OR_sw is int) &&
      imageDataColorSettings == null) {
    var imageDataColorSettings_1 = convertDartToNative_Dictionary(
      imageDataColorSettings_OR_sh,
    );
    return convertNativeToDart_ImageData(
      _createImageData_3(
        data_OR_imagedata_OR_sw,
        sh_OR_sw,
        imageDataColorSettings_1,
      ),
    );
  }
  if (imageDataColorSettings != null &&
      (imageDataColorSettings_OR_sh is int) &&
      sh_OR_sw != null &&
      data_OR_imagedata_OR_sw != null) {
    var imageDataColorSettings_1 = convertDartToNative_Dictionary(
      imageDataColorSettings,
    );
    return convertNativeToDart_ImageData(
      _createImageData_4(
        data_OR_imagedata_OR_sw,
        sh_OR_sw,
        imageDataColorSettings_OR_sh,
        imageDataColorSettings_1,
      ),
    );
  }
  throw new ArgumentError("Incorrect number or type of arguments");
}

createLinearGradient()#

CanvasGradient createLinearGradient(num x0, num y0, num x1, num y1) native;

createPattern()#

CanvasPattern? createPattern(
  /*CanvasImageSource*/ image,
  String repetitionType,
) native;

createRadialGradient()#

CanvasGradient createRadialGradient(
  num x0,
  num y0,
  num r0,
  num x1,
  num y1,
  num r1,
) native;

drawImage()#

void drawImage(
  /*CanvasImageSource*/ image,
  num sx_OR_x,
  num sy_OR_y, [
  num? sw_OR_width,
  num? height_OR_sh,
  num? dx,
  num? dy,
  num? dw,
  num? dh,
]) native;

ellipse()#

void ellipse(
  num x,
  num y,
  num radiusX,
  num radiusY,
  num rotation,
  num startAngle,
  num endAngle,
  bool? anticlockwise,
) native;

fill()#

void fill([path_OR_winding, String? winding]) native;

fillRect()#

void fillRect(num x, num y, num width, num height) native;

fillText()#

void fillText(String text, num x, num y, [num? maxWidth]) native;

getImageData()#

ImageData getImageData(int sx, int sy, int sw, int sh) {
  return convertNativeToDart_ImageData(_getImageData_1(sx, sy, sw, sh));
}

getLineDash()#

List<num> getLineDash() native;

isPointInPath()#

bool isPointInPath(
  path_OR_x,
  num x_OR_y, [
  winding_OR_y,
  String? winding,
]) native;

isPointInStroke()#

bool isPointInStroke(path_OR_x, num x_OR_y, [num? y]) native;

lineTo()#

void lineTo(num x, num y) native;

measureText()#

TextMetrics measureText(String text) native;

moveTo()#

void moveTo(num x, num y) native;

noSuchMethod() inherited#

Invoked when a nonexistent method or property is accessed.

A dynamic member invocation can attempt to call a member which doesn't exist on the receiving object. Example:

dynamic object = 1;
object.add(42); // Statically allowed, run-time error

This invalid code will invoke the noSuchMethod method of the integer 1 with an Invocation representing the .add(42) call and arguments (which then throws).

Classes can override noSuchMethod to provide custom behavior for such invalid dynamic invocations.

A class with a non-default noSuchMethod invocation can also omit implementations for members of its interface. Example:

class MockList<T> implements List<T> {
  noSuchMethod(Invocation invocation) {
    log(invocation);
    super.noSuchMethod(invocation); // Will throw.
  }
}
void main() {
  MockList().add(42);
}

This code has no compile-time warnings or errors even though the MockList class has no concrete implementation of any of the List interface methods. Calls to List methods are forwarded to noSuchMethod, so this code will log an invocation similar to Invocation.method(#add, [42]) and then throw.

If a value is returned from noSuchMethod, it becomes the result of the original invocation. If the value is not of a type that can be returned by the original invocation, a type error occurs at the invocation.

The default behavior is to throw a NoSuchMethodError.

Inherited from Interceptor.

dynamic noSuchMethod(Invocation invocation) {
  throw NoSuchMethodError.withInvocation(this, invocation);
}

putImageData()#

void putImageData(
  ImageData imagedata,
  int dx,
  int dy, [
  int? dirtyX,
  int? dirtyY,
  int? dirtyWidth,
  int? dirtyHeight,
]) {
  if (dirtyX == null &&
      dirtyY == null &&
      dirtyWidth == null &&
      dirtyHeight == null) {
    var imagedata_1 = convertDartToNative_ImageData(imagedata);
    _putImageData_1(imagedata_1, dx, dy);
    return;
  }
  if (dirtyHeight != null &&
      dirtyWidth != null &&
      dirtyY != null &&
      dirtyX != null) {
    var imagedata_1 = convertDartToNative_ImageData(imagedata);
    _putImageData_2(
      imagedata_1,
      dx,
      dy,
      dirtyX,
      dirtyY,
      dirtyWidth,
      dirtyHeight,
    );
    return;
  }
  throw new ArgumentError("Incorrect number or type of arguments");
}

quadraticCurveTo()#

void quadraticCurveTo(num cpx, num cpy, num x, num y) native;

rect()#

void rect(num x, num y, num width, num height) native;

resetTransform()#

void resetTransform() native;

restore()#

void restore() native;

rotate()#

void rotate(num angle) native;

save()#

void save() native;

scale()#

void scale(num x, num y) native;

setLineDash()#

void setLineDash(List<num> dash) native;

setTransform()#

void setTransform(num a, num b, num c, num d, num e, num f) native;

stroke()#

void stroke([Path2D? path]) native;

strokeRect()#

void strokeRect(num x, num y, num width, num height) native;

strokeText()#

void strokeText(String text, num x, num y, [num? maxWidth]) native;

toString() inherited#

A string representation of this object.

Some classes have a default textual representation, often paired with a static parse function (like int.parse). These classes will provide the textual representation as their string representation.

Other classes have no meaningful textual representation that a program will care about. Such classes will typically override toString to provide useful information when inspecting the object, mainly for debugging or logging.

Inherited from Interceptor.

String toString() => Primitives.objectToHumanReadableString(this);

transform()#

void transform(num a, num b, num c, num d, num e, num f) native;

translate()#

void translate(num x, num y) native;

Operators#

operator ==() inherited#

The equality operator.

The default behavior for all Objects is to return true if and only if this object and other are the same object.

Override this method to specify a different equality relation on a class. The overriding method must still be an equivalence relation. That is, it must be:

• Total: It must return a boolean for all arguments. It should never throw.

• Reflexive: For all objects o, o == o must be true.

• Symmetric: For all objects o1 and o2, o1 == o2 and o2 == o1 must either both be true, or both be false.

• Transitive: For all objects o1, o2, and o3, if o1 == o2 and o2 == o3 are true, then o1 == o3 must be true.

The method should also be consistent over time, so whether two objects are equal should only change if at least one of the objects was modified.

If a subclass overrides the equality operator, it should override the hashCode method as well to maintain consistency.

Inherited from Interceptor.

bool operator ==(Object other) => identical(this, other);