From da78a9e329e272dedb2400b79a3bdeebff387d47 Mon Sep 17 00:00:00 2001 From: Peter Bengtsson Date: Tue, 8 Dec 2020 14:42:17 -0500 Subject: initial commit --- .../api/canvasrenderingcontext2d/canvas/index.html | 101 +++++ .../canvasrenderingcontext2d/fillstyle/index.html | 209 ++++++++++ .../it/web/api/canvasrenderingcontext2d/index.html | 448 +++++++++++++++++++++ .../ispointinpath/index.html | 208 ++++++++++ 4 files changed, 966 insertions(+) create mode 100644 files/it/web/api/canvasrenderingcontext2d/canvas/index.html create mode 100644 files/it/web/api/canvasrenderingcontext2d/fillstyle/index.html create mode 100644 files/it/web/api/canvasrenderingcontext2d/index.html create mode 100644 files/it/web/api/canvasrenderingcontext2d/ispointinpath/index.html (limited to 'files/it/web/api/canvasrenderingcontext2d') diff --git a/files/it/web/api/canvasrenderingcontext2d/canvas/index.html b/files/it/web/api/canvasrenderingcontext2d/canvas/index.html new file mode 100644 index 0000000000..bb453e4419 --- /dev/null +++ b/files/it/web/api/canvasrenderingcontext2d/canvas/index.html @@ -0,0 +1,101 @@ +--- +title: CanvasRenderingContext2D.canvas +slug: Web/API/CanvasRenderingContext2D/canvas +translation_of: Web/API/CanvasRenderingContext2D/canvas +--- +
{{APIRef}}
+ +

La proprietà CanvasRenderingContext2D.canvas è un riferimento di sola lettura verso il canvas {{domxref("HTMLCanvasElement")}} che contiene il context corrente. Può essere {{jsxref("null")}} se non vi è un elemento {{HTMLElement("canvas")}} associato.

+ +

Sintassi

+ +
ctx.canvas;
+ +

Esempi

+ +

Dato il seguente elmento  {{HTMLElement("canvas")}}:

+ +
<canvas id="canvas"></canvas>
+
+ +

È possibile ottenere un riferimento all'elemento canvas da cui è ottenuto questo CanvasRenderingContext2D utilizzando la property canvas:

+ +
var canvas = document.getElementById("canvas");
+var ctx = canvas.getContext("2d");
+ctx.canvas // HTMLCanvasElement
+
+ +

Specifiche

+ + + + + + + + + + + + + + +
SpecificaStatoCommenti
{{SpecName('HTML WHATWG', "scripting.html#dom-context-2d-canvas", "CanvasRenderingContext2D.canvas")}}{{Spec2('HTML WHATWG')}} 
+ +

Compatibilità Browser

+ +

{{ CompatibilityTable() }}

+ +
+ + + + + + + + + + + + + + + + + + + +
CaratteristicaChromeFirefox (Gecko)Internet ExplorerOperaSafari
Supporto base{{CompatVersionUnknown}}{{CompatVersionUnknown}}{{CompatVersionUnknown}}{{CompatVersionUnknown}}{{CompatVersionUnknown}}
+
+ +
+ + + + + + + + + + + + + + + + + + + + + +
CaratteristicaAndroidChrome for AndroidFirefox Mobile (Gecko)IE MobileOpera MobileSafari Mobile
Supporto base{{CompatVersionUnknown}}{{CompatVersionUnknown}}{{CompatVersionUnknown}}{{CompatVersionUnknown}}{{CompatVersionUnknown}}{{CompatVersionUnknown}}
+
+ +

Vedi anche

+ + diff --git a/files/it/web/api/canvasrenderingcontext2d/fillstyle/index.html b/files/it/web/api/canvasrenderingcontext2d/fillstyle/index.html new file mode 100644 index 0000000000..2f905a5241 --- /dev/null +++ b/files/it/web/api/canvasrenderingcontext2d/fillstyle/index.html @@ -0,0 +1,209 @@ +--- +title: CanvasRenderingContext2D.fillStyle +slug: Web/API/CanvasRenderingContext2D/fillStyle +tags: + - API + - CamvasRenderingContext2D + - Canvas + - Proprietà + - Riferimento +translation_of: Web/API/CanvasRenderingContext2D/fillStyle +--- +
{{APIRef}}
+ +

La proprietà CanvasRenderingContext2D.fillStyle delle Canvas 2D API specifica il colore o lo stile da usare all'interno delle forme. Il colore preimpostato è #000 (nero).

+ +

Vedi anche i capitoli Applicare stili e colori nel Canvas Tutorial.

+ +

Sintassi

+ +
ctx.fillStyle = color;
+ctx.fillStyle = gradient;
+ctx.fillStyle = pattern;
+
+ +

Opzioni

+ +
+
color
+
Una {{domxref("DOMString")}} letta come valore CSS {{cssxref("<color>")}}.
+
gradient
+
Un oggetto {{domxref("CanvasGradient")}} (gradiente lineare o radiale).
+
pattern
+
Un oggetto {{domxref("CanvasPattern")}} (immagine ripetuta).
+
+ +

Esempi

+ +

Usare la proprietà fillStyle per impostare un colore diverso

+ +

In questa semplice porzione di codice viene usata la proprietù fillStyle per impostare un colore diverso.

+ +

HTML

+ +
<canvas id="canvas"></canvas>
+
+ +

JavaScript

+ +
var canvas = document.getElementById("canvas");
+var ctx = canvas.getContext("2d");
+
+ctx.fillStyle = "blue";
+ctx.fillRect(10, 10, 100, 100);
+
+ +

Modifica il codice qui sotto e vedi i cambiamenti in tempo reale nel canvas:

+ + + +

{{ EmbedLiveSample('Playable_code', 700, 360) }}

+ +

Un esempio di fillStyle con i cicli for

+ +

In questo esempio, useremo due cicli for per disegnare una griglia di rettangoli, ognuno di un colore differente. Il risultato finale dovrebbe assomigliare allo screenshot. Niente di particolarmente spettacolare. Usiamo due variabili i e j per generare un colore RGB unico per ogni quadrato, questo modificando soltanto i valori del rosso e del verde. Il canale del blu ha un valore fisso. Modificando i canali, puoi generare ogni tipo di palette. Aumentando le ripetizioni del ciclo, puoi ottenere qualcosa di assomigliante alle palette usate da Photoshop.

+ + + +
var ctx = document.getElementById('canvas').getContext('2d');
+for (var i=0;i<6;i++){
+  for (var j=0;j<6;j++){
+    ctx.fillStyle = 'rgb(' + Math.floor(255-42.5*i) + ',' +
+                     Math.floor(255-42.5*j) + ',0)';
+    ctx.fillRect(j*25,i*25,25,25);
+  }
+}
+
+ +

Il risultato assomiglia a questo:

+ +

{{EmbedLiveSample("Un_esempio_di_fillStyle_con_i_cicli_for", 160, 160, "https://mdn.mozillademos.org/files/5417/Canvas_fillstyle.png")}}

+ +

Specifiche

+ + + + + + + + + + + + + + +
SpecificheStatoCommento
{{SpecName('HTML WHATWG', "scripting.html#dom-context-2d-fillstyle", "CanvasRenderingContext2D.fillStyle")}}{{Spec2('HTML WHATWG')}} 
+ +

Compatibilità dei Browser

+ +

{{CompatibilityTable}}

+ +
+ + + + + + + + + + + + + + + + + + + +
CaratteristicaChromeFirefox (Gecko)Internet ExplorerOperaSafari
Basic support{{CompatVersionUnknown}}{{CompatVersionUnknown}}{{CompatVersionUnknown}}{{CompatVersionUnknown}}{{CompatVersionUnknown}}
+
+ +
+ + + + + + + + + + + + + + + + + + + + + +
CaratteristicaAndroidChrome for AndroidFirefox Mobile (Gecko)IE MobileOpera MobileSafari Mobile
Basic support{{CompatVersionUnknown}}{{CompatVersionUnknown}}{{CompatVersionUnknown}}{{CompatVersionUnknown}}{{CompatVersionUnknown}}{{CompatVersionUnknown}}
+
+ + + + + +

Vedi anche

+ + diff --git a/files/it/web/api/canvasrenderingcontext2d/index.html b/files/it/web/api/canvasrenderingcontext2d/index.html new file mode 100644 index 0000000000..e6b2eb7167 --- /dev/null +++ b/files/it/web/api/canvasrenderingcontext2d/index.html @@ -0,0 +1,448 @@ +--- +title: CanvasRenderingContext2D +slug: Web/API/CanvasRenderingContext2D +tags: + - API + - Canvas + - CanvasRenderingContext2D + - Games + - Graphics + - NeedsTranslation + - Reference + - TopicStub +translation_of: Web/API/CanvasRenderingContext2D +--- +
{{APIRef}}
+ +The CanvasRenderingContext2D interface provides the 2D rendering context for the drawing surface of a {{ HTMLElement("canvas") }} element. + +

To get an object of this interface, call {{domxref("HTMLCanvasElement.getContext()", "getContext()")}} on a <canvas>, supplying "2d" as the argument:

+ +
var canvas = document.getElementById('mycanvas');
+var ctx = canvas.getContext('2d');
+
+ +

Once you have the 2D rendering context for a canvas, you can draw within it. For example:

+ +
ctx.fillStyle = "rgb(200,0,0)";
+ctx.fillRect(10, 10, 55, 50);
+
+ +

See the properties and methods in the sidebar and below. The canvas tutorial has more information, examples, and resources as well.

+ +

Drawing rectangles

+ +

There are three methods that immediately draw rectangles to the bitmap.

+ +
+
{{domxref("CanvasRenderingContext2D.clearRect()")}}
+
Sets all pixels in the rectangle defined by starting point (x, y) and size (width, height) to transparent black, erasing any previously drawn content.
+
{{domxref("CanvasRenderingContext2D.fillRect()")}}
+
Draws a filled rectangle at (x, y) position whose size is determined by width and height.
+
{{domxref("CanvasRenderingContext2D.strokeRect()")}}
+
Paints a rectangle which has a starting point at (x, y) and has a w width and an h height onto the canvas, using the current stroke style.
+
+ +

Drawing text

+ +

The following methods are provided for drawing text. See also the {{domxref("TextMetrics")}} object for text properties.

+ +
+
{{domxref("CanvasRenderingContext2D.fillText()")}}
+
Draws (fills) a given text at the given (x,y) position.
+
{{domxref("CanvasRenderingContext2D.strokeText()")}}
+
Draws (strokes) a given text at the given (x, y) position.
+
{{domxref("CanvasRenderingContext2D.measureText()")}}
+
Returns a {{domxref("TextMetrics")}} object.
+
+ +

Line styles

+ +

The following methods and properties control how lines are drawn.

+ +
+
{{domxref("CanvasRenderingContext2D.lineWidth")}}
+
Width of lines. Default 1.0
+
{{domxref("CanvasRenderingContext2D.lineCap")}}
+
Type of endings on the end of lines. Possible values: butt (default), round, square.
+
{{domxref("CanvasRenderingContext2D.lineJoin")}}
+
Defines the type of corners where two lines meet. Possible values: round, bevel, miter (default).
+
{{domxref("CanvasRenderingContext2D.miterLimit")}}
+
Miter limit ratio. Default 10.
+
{{domxref("CanvasRenderingContext2D.getLineDash()")}}
+
Returns the current line dash pattern array containing an even number of non-negative numbers.
+
{{domxref("CanvasRenderingContext2D.setLineDash()")}}
+
Sets the current line dash pattern.
+
{{domxref("CanvasRenderingContext2D.lineDashOffset")}}
+
Specifies where to start a dash array on a line.
+
+ +

Text styles

+ +

The following properties control how text is laid out.

+ +
+
{{domxref("CanvasRenderingContext2D.font")}}
+
Font setting. Default value 10px sans-serif.
+
{{domxref("CanvasRenderingContext2D.textAlign")}}
+
Text alignment setting. Possible values: start (default), end, left, right or center.
+
{{domxref("CanvasRenderingContext2D.textBaseline")}}
+
Baseline alignment setting. Possible values: top, hanging, middle, alphabetic (default), ideographic, bottom.
+
{{domxref("CanvasRenderingContext2D.direction")}}
+
Directionality. Possible values: ltr, rtl, inherit (default).
+
+ +

Fill and stroke styles

+ +

Fill styling is used for colors and styles inside shapes and stroke styling is used for the lines around shapes.

+ +
+
{{domxref("CanvasRenderingContext2D.fillStyle")}}
+
Color or style to use inside shapes. Default #000 (black).
+
{{domxref("CanvasRenderingContext2D.strokeStyle")}}
+
Color or style to use for the lines around shapes. Default #000 (black).
+
+ +

Gradients and patterns

+ +
+
{{domxref("CanvasRenderingContext2D.createLinearGradient()")}}
+
Creates a linear gradient along the line given by the coordinates represented by the parameters.
+
{{domxref("CanvasRenderingContext2D.createRadialGradient()")}}
+
Creates a radial gradient along the line given by the coordinates represented by the parameters.
+
{{domxref("CanvasRenderingContext2D.createPattern()")}}
+
Creates a pattern using the specified image (a {{domxref("CanvasImageSource")}}). It repeats the source in the directions specified by the repetition argument. This method returns a {{domxref("CanvasPattern")}}.
+
+ +

Shadows

+ +
+
{{domxref("CanvasRenderingContext2D.shadowBlur")}}
+
Specifies the blurring effect. Default 0
+
{{domxref("CanvasRenderingContext2D.shadowColor")}}
+
Color of the shadow. Default fully-transparent black.
+
{{domxref("CanvasRenderingContext2D.shadowOffsetX")}}
+
Horizontal distance the shadow will be offset. Default 0.
+
{{domxref("CanvasRenderingContext2D.shadowOffsetY")}}
+
Vertical distance the shadow will be offset. Default 0.
+
+ +

Paths

+ +

The following methods can be used to manipulate paths of objects.

+ +
+
{{domxref("CanvasRenderingContext2D.beginPath()")}}
+
Starts a new path by emptying the list of sub-paths. Call this method when you want to create a new path.
+
{{domxref("CanvasRenderingContext2D.closePath()")}}
+
Causes the point of the pen to move back to the start of the current sub-path. It tries to draw a straight line from the current point to the start. If the shape has already been closed or has only one point, this function does nothing.
+
{{domxref("CanvasRenderingContext2D.moveTo()")}}
+
Moves the starting point of a new sub-path to the (x, y) coordinates.
+
{{domxref("CanvasRenderingContext2D.lineTo()")}}
+
Connects the last point in the subpath to the x, y coordinates with a straight line.
+
{{domxref("CanvasRenderingContext2D.bezierCurveTo()")}}
+
Adds a cubic Bézier curve to the path. It requires three points. The first two points are control points and the third one is the end point. The starting point is the last point in the current path, which can be changed using moveTo() before creating the Bézier curve.
+
{{domxref("CanvasRenderingContext2D.quadraticCurveTo()")}}
+
Adds a quadratic Bézier curve to the current path.
+
{{domxref("CanvasRenderingContext2D.arc()")}}
+
Adds an arc to the path which is centered at (x, y) position with radius r starting at startAngle and ending at endAngle going in the given direction by anticlockwise (defaulting to clockwise).
+
{{domxref("CanvasRenderingContext2D.arcTo()")}}
+
Adds an arc to the path with the given control points and radius, connected to the previous point by a straight line.
+
{{domxref("CanvasRenderingContext2D.ellipse()")}} {{experimental_inline}}
+
Adds an ellipse to the path which is centered at (x, y) position with the radii radiusX and radiusY starting at startAngle and ending at endAngle going in the given direction by anticlockwise (defaulting to clockwise).
+
{{domxref("CanvasRenderingContext2D.rect()")}}
+
Creates a path for a rectangle at position (x, y) with a size that is determined by width and height.
+
+ +

Drawing paths

+ +
+
{{domxref("CanvasRenderingContext2D.fill()")}}
+
Fills the subpaths with the current fill style.
+
{{domxref("CanvasRenderingContext2D.stroke()")}}
+
Strokes the subpaths with the current stroke style.
+
{{domxref("CanvasRenderingContext2D.drawFocusIfNeeded()")}}
+
If a given element is focused, this method draws a focus ring around the current path.
+
{{domxref("CanvasRenderingContext2D.scrollPathIntoView()")}}
+
Scrolls the current path or a given path into the view.
+
{{domxref("CanvasRenderingContext2D.clip()")}}
+
Creates a clipping path from the current sub-paths. Everything drawn after clip() is called appears inside the clipping path only. For an example, see Clipping paths in the Canvas tutorial.
+
{{domxref("CanvasRenderingContext2D.isPointInPath()")}}
+
Reports whether or not the specified point is contained in the current path.
+
{{domxref("CanvasRenderingContext2D.isPointInStroke()")}}
+
Reports whether or not the specified point is inside the area contained by the stroking of a path.
+
+ +

Transformations

+ +

Objects in the CanvasRenderingContext2D rendering context have a current transformation matrix and methods to manipulate it. The transformation matrix is applied when creating the current default path, painting text, shapes and {{domxref("Path2D")}} objects. The methods listed below remain for historical and compatibility reasons as {{domxref("SVGMatrix")}} objects are used in most parts of the API nowadays and will be used in the future instead.

+ +
+
{{domxref("CanvasRenderingContext2D.currentTransform")}}
+
Current transformation matrix ({{domxref("SVGMatrix")}} object).
+
{{domxref("CanvasRenderingContext2D.rotate()")}}
+
Adds a rotation to the transformation matrix. The angle argument represents a clockwise rotation angle and is expressed in radians.
+
{{domxref("CanvasRenderingContext2D.scale()")}}
+
Adds a scaling transformation to the canvas units by x horizontally and by y vertically.
+
{{domxref("CanvasRenderingContext2D.translate()")}}
+
Adds a translation transformation by moving the canvas and its origin x horzontally and y vertically on the grid.
+
{{domxref("CanvasRenderingContext2D.transform()")}}
+
Multiplies the current transformation matrix with the matrix described by its arguments.
+
{{domxref("CanvasRenderingContext2D.setTransform()")}}
+
Resets the current transform to the identity matrix, and then invokes the transform() method with the same arguments.
+
{{domxref("CanvasRenderingContext2D.resetTransform()")}} {{experimental_inline}}
+
Resets the current transform by the identity matrix.
+
+ +

Compositing

+ +
+
{{domxref("CanvasRenderingContext2D.globalAlpha")}}
+
Alpha value that is applied to shapes and images before they are composited onto the canvas. Default 1.0 (opaque).
+
{{domxref("CanvasRenderingContext2D.globalCompositeOperation")}}
+
With globalAlpha applied this sets how shapes and images are drawn onto the existing bitmap.
+
+ +

Drawing images

+ +
+
{{domxref("CanvasRenderingContext2D.drawImage()")}}
+
Draws the specified image. This method is available in multiple formats, providing a great deal of flexibility in its use.
+
+ +

Pixel manipulation

+ +

See also the {{domxref("ImageData")}} object.

+ +
+
{{domxref("CanvasRenderingContext2D.createImageData()")}}
+
Creates a new, blank {{domxref("ImageData")}} object with the specified dimensions. All of the pixels in the new object are transparent black.
+
{{domxref("CanvasRenderingContext2D.getImageData()")}}
+
Returns an {{domxref("ImageData")}} object representing the underlying pixel data for the area of the canvas denoted by the rectangle which starts at (sx, sy) and has an sw width and sh height.
+
{{domxref("CanvasRenderingContext2D.putImageData()")}}
+
Paints data from the given {{domxref("ImageData")}} object onto the bitmap. If a dirty rectangle is provided, only the pixels from that rectangle are painted.
+
+ +

Image smoothing

+ +
+
{{domxref("CanvasRenderingContext2D.imageSmoothingEnabled")}} {{experimental_inline}}
+
Image smoothing mode; if disabled, images will not be smoothed if scaled.
+
+ +

The canvas state

+ +

The CanvasRenderingContext2D rendering context contains a variety of drawing style states (attributes for line styles, fill styles, shadow styles, text styles). The following methods help you to work with that state:

+ +
+
{{domxref("CanvasRenderingContext2D.save()")}}
+
Saves the current drawing style state using a stack so you can revert any change you make to it using restore().
+
{{domxref("CanvasRenderingContext2D.restore()")}}
+
Restores the drawing style state to the last element on the 'state stack' saved by save().
+
{{domxref("CanvasRenderingContext2D.canvas")}}
+
A read-only back-reference to the {{domxref("HTMLCanvasElement")}}. Might be {{jsxref("null")}} if it is not associated with a {{HTMLElement("canvas")}} element.
+
+ +

Hit regions

+ +
+
{{domxref("CanvasRenderingContext2D.addHitRegion()")}} {{experimental_inline}}
+
Adds a hit region to the canvas.
+
{{domxref("CanvasRenderingContext2D.removeHitRegion()")}} {{experimental_inline}}
+
Removes the hit region with the specified id from the canvas.
+
{{domxref("CanvasRenderingContext2D.clearHitRegions()")}} {{experimental_inline}}
+
Removes all hit regions from the canvas.
+
+ +

Non-standard APIs

+ + + +

Most of these APIs are deprecated and will be removed in the future.

+ +
+
{{non-standard_inline}} CanvasRenderingContext2D.clearShadow()
+
Removes all shadow settings like {{domxref("CanvasRenderingContext2D.shadowColor")}} and {{domxref("CanvasRenderingContext2D.shadowBlur")}}.
+
{{non-standard_inline}} CanvasRenderingContext2D.drawImageFromRect()
+
This is redundant with an equivalent overload of drawImage.
+
{{non-standard_inline}} CanvasRenderingContext2D.setAlpha()
+
Use {{domxref("CanvasRenderingContext2D.globalAlpha")}} instead.
+
{{non-standard_inline}} CanvasRenderingContext2D.setCompositeOperation()
+
Use {{domxref("CanvasRenderingContext2D.globalCompositeOperation")}} instead.
+
{{non-standard_inline}} CanvasRenderingContext2D.setLineWidth()
+
Use {{domxref("CanvasRenderingContext2D.lineWidth")}} instead.
+
{{non-standard_inline}} CanvasRenderingContext2D.setLineJoin()
+
Use {{domxref("CanvasRenderingContext2D.lineJoin")}} instead.
+
{{non-standard_inline}} CanvasRenderingContext2D.setLineCap()
+
Use {{domxref("CanvasRenderingContext2D.lineCap")}} instead.
+
{{non-standard_inline}} CanvasRenderingContext2D.setMiterLimit()
+
Use {{domxref("CanvasRenderingContext2D.miterLimit")}} instead.
+
{{non-standard_inline}} CanvasRenderingContext2D.setStrokeColor()
+
Use {{domxref("CanvasRenderingContext2D.strokeStyle")}} instead.
+
{{non-standard_inline}} CanvasRenderingContext2D.setFillColor()
+
Use {{domxref("CanvasRenderingContext2D.fillStyle")}} instead.
+
{{non-standard_inline}} CanvasRenderingContext2D.setShadow()
+
Use {{domxref("CanvasRenderingContext2D.shadowColor")}} and {{domxref("CanvasRenderingContext2D.shadowBlur")}} instead.
+
{{non-standard_inline}} CanvasRenderingContext2D.webkitLineDash
+
Use {{domxref("CanvasRenderingContext2D.getLineDash()")}} and {{domxref("CanvasRenderingContext2D.setLineDash()")}} instead.
+
{{non-standard_inline}} CanvasRenderingContext2D.webkitLineDashOffset
+
Use {{domxref("CanvasRenderingContext2D.lineDashOffset")}} instead.
+
{{non-standard_inline}} CanvasRenderingContext2D.webkitImageSmoothingEnabled
+
Use {{domxref("CanvasRenderingContext2D.imageSmoothingEnabled")}} instead.
+
+ + + +
+
{{non-standard_inline}} CanvasRenderingContext2D.getContextAttributes()
+
Inspired by the same WebGLRenderingContext method it returns an Canvas2DContextAttributes object that contains the attributes "storage" to indicate which storage is used ("persistent" by default) and the attribute "alpha" (true by default) to indicate that transparency is used in the canvas.
+
{{non-standard_inline}} CanvasRenderingContext2D.isContextLost()
+
Inspired by the same WebGLRenderingContext method it returns true if the Canvas context has been lost, or false if not.
+
+ +

WebKit only

+ +
+
{{non-standard_inline}} CanvasRenderingContext2D.webkitBackingStorePixelRatio
+
The backing store size in relation to the canvas element. See High DPI Canvas.
+
{{non-standard_inline}} CanvasRenderingContext2D.webkitGetImageDataHD
+
Intended for HD backing stores, but removed from canvas specifications.
+
{{non-standard_inline}} CanvasRenderingContext2D.webkitPutImageDataHD
+
Intended for HD backing stores, but removed from canvas specifications.
+
+ +
+
+ +

Gecko only

+ +
+
{{non-standard_inline}} {{domxref("CanvasRenderingContext2D.filter")}}
+
CSS and SVG filters as Canvas APIs. Likely to be standardized in a new version of the specification.
+
+ +

Prefixed APIs

+ +
+
{{non-standard_inline}} CanvasRenderingContext2D.mozCurrentTransform
+
Sets or gets the current transformation matrix, see {{domxref("CanvasRenderingContext2D.currentTransform")}}.  {{ gecko_minversion_inline("7.0") }}
+
{{non-standard_inline}} CanvasRenderingContext2D.mozCurrentTransformInverse
+
Sets or gets the current inversed transformation matrix.  {{ gecko_minversion_inline("7.0") }}
+
{{non-standard_inline}} CanvasRenderingContext2D.mozFillRule
+
The fill rule to use. This must be one of evenodd or nonzero (default).
+
{{non-standard_inline}} CanvasRenderingContext2D.mozImageSmoothingEnabled
+
See {{domxref("CanvasRenderingContext2D.imageSmoothingEnabled")}}.
+
{{non-standard_inline}} {{deprecated_inline}} CanvasRenderingContext2D.mozDash
+
An array which specifies the lengths of alternating dashes and gaps {{ gecko_minversion_inline("7.0") }}. Use {{domxref("CanvasRenderingContext2D.getLineDash()")}} and {{domxref("CanvasRenderingContext2D.setLineDash()")}} instead.
+
{{non-standard_inline}} {{deprecated_inline}} CanvasRenderingContext2D.mozDashOffset
+
Specifies where to start a dash array on a line. {{ gecko_minversion_inline("7.0") }}. Use {{domxref("CanvasRenderingContext2D.lineDashOffset")}} instead.
+
{{non-standard_inline}} {{deprecated_inline}} CanvasRenderingContext2D.mozTextStyle
+
Introduced in in Gecko 1.9, deprecated in favor of the {{domxref("CanvasRenderingContext2D.font")}} property.
+
{{non-standard_inline}} {{obsolete_inline}} CanvasRenderingContext2D.mozDrawText()
+
This method was introduced in Gecko 1.9 and is removed starting with Gecko 7.0. Use {{domxref("CanvasRenderingContext2D.strokeText()")}} or {{domxref("CanvasRenderingContext2D.fillText()")}} instead.
+
{{non-standard_inline}} {{obsolete_inline}} CanvasRenderingContext2D.mozMeasureText()
+
This method was introduced in Gecko 1.9 and is unimplemented starting with Gecko 7.0. Use {{domxref("CanvasRenderingContext2D.measureText()")}} instead.
+
{{non-standard_inline}} {{obsolete_inline}} CanvasRenderingContext2D.mozPathText()
+
This method was introduced in Gecko 1.9 and is removed starting with Gecko 7.0.
+
{{non-standard_inline}} {{obsolete_inline}} CanvasRenderingContext2D.mozTextAlongPath()
+
This method was introduced in Gecko 1.9 and is removed starting with Gecko 7.0.
+
+ +

Internal APIs (chrome-context only)

+ +
+
{{non-standard_inline}} {{domxref("CanvasRenderingContext2D.asyncDrawXULElement()")}}
+
Renders a region of a XUL element into the canvas.
+
{{non-standard_inline}} {{domxref("CanvasRenderingContext2D.drawWindow()")}}
+
Renders a region of a window into the canvas. The contents of the window's viewport are rendered, ignoring viewport clipping and scrolling.
+
{{non-standard_inline}} CanvasRenderingContext2D.demote()
+
This causes a context that is currently using a hardware-accelerated backend to fallback to a software one. All state should be preserved.
+
+ +

Internet Explorer

+ +
+
{{non-standard_inline}} CanvasRenderingContext2D.msFillRule
+
The fill rule to use. This must be one of evenodd or nonzero (default).
+
+ +

Specifications

+ + + + + + + + + + + + + + +
SpecificationStatusComment
{{SpecName('HTML WHATWG', "scripting.html#2dcontext:canvasrenderingcontext2d", "CanvasRenderingContext2D")}}{{Spec2('HTML WHATWG')}} 
+ +

Browser compatibility

+ +
{{CompatibilityTable}}
+ +
+ + + + + + + + + + + + + + + + + + + +
FeatureChromeFirefox (Gecko)Internet ExplorerOperaSafari
Basic support{{CompatChrome("1")}}{{CompatGeckoDesktop("1.8")}}{{CompatIE("9")}}{{CompatOpera("9")}}{{CompatSafari("2")}}
+
+ +
+ + + + + + + + + + + + + + + + + + + + + +
FeatureAndroidChrome for AndroidFirefox Mobile (Gecko)IE MobileOpera MobileSafari Mobile
Basic support{{CompatUnknown}}{{CompatUnknown}}{{CompatUnknown}}{{CompatUnknown}}{{CompatUnknown}}{{CompatUnknown}}
+
+ +

Compatibility notes

+ + + +

See also

+ + diff --git a/files/it/web/api/canvasrenderingcontext2d/ispointinpath/index.html b/files/it/web/api/canvasrenderingcontext2d/ispointinpath/index.html new file mode 100644 index 0000000000..bcb314845c --- /dev/null +++ b/files/it/web/api/canvasrenderingcontext2d/ispointinpath/index.html @@ -0,0 +1,208 @@ +--- +title: CanvasRenderingContext2D.isPointInPath() +slug: Web/API/CanvasRenderingContext2D/isPointInPath +translation_of: Web/API/CanvasRenderingContext2D/isPointInPath +--- +
{{APIRef}}
+ +

Il metodo CanvasRenderingContext2D.isPointInPath() delle API Canvas 2D controlla se un punto specificato cade all'interno del path corrente.

+ +

Sintassi

+ +
boolean ctx.isPointInPath(x, y);
+boolean ctx.isPointInPath(x, y, algorithmo);
+
+boolean ctx.isPointInPath(path, x, y);
+boolean ctx.isPointInPath(path, x, y, algoritmo);
+
+ +

Parametri

+ +
+
x
+
La coordinata X del punto da controllare
+
y
+
La coordinata Y del punto da controllare
+
Algoritmo
+
La'lgoritmo con cui viene verificato se il punto cade all'interno del path.
+ Valori possibili: +
    +
  • "nonzero": La regola non-zero ,  valore predefinito.
    • +
  • "evenodd": La regola even-odd .
    • +
+
+
path
+
Il {{domxref("Path2D")}} path da usare come path corrente.
+
+ +

Restituisce

+ +
+
{{jsxref("Boolean")}}
+
+

Un Boolean, che sarà true (vero) se il punto cade all'interno della forma, altrimenti restitiusce false (falso).

+
+
+ +

Esempi

+ +

Uso del metodo isPointInPath

+ +

Questa è una semplice snippet che usa il metodo isPointInPath per controllare se un punto cade o no sulla forma corrente.

+ +

HTML

+ +
<canvas id="canvas"></canvas>
+
+ +

JavaScript

+ +
var canvas = document.getElementById("canvas");
+var ctx = canvas.getContext("2d");
+
+ctx.rect(10, 10, 100, 100);
+ctx.stroke();
+console.log(ctx.isPointInPath(10, 10)); // true
+
+ +

Modifica il codice qui sotto, e guarda live come cambia il canvas: per guardare i log apri la tua console

+ +
+
Playable code
+ +
<canvas id="canvas" width="400" height="200" class="playable-canvas"></canvas>
+<div class="playable-buttons">
+  <input id="edit" type="button" value="Edit" />
+  <input id="reset" type="button" value="Reset" />
+</div>
+<textarea id="code" class="playable-code">
+ctx.rect(10, 10, 100, 100);
+ctx.stroke();
+console.log(ctx.isPointInPath(10, 10)); // true</textarea>
+
+ +
var canvas = document.getElementById("canvas");
+var ctx = canvas.getContext("2d");
+var textarea = document.getElementById("code");
+var reset = document.getElementById("reset");
+var edit = document.getElementById("edit");
+var code = textarea.value;
+
+function drawCanvas() {
+  ctx.clearRect(0, 0, canvas.width, canvas.height);
+  eval(textarea.value);
+}
+
+reset.addEventListener("click", function() {
+  textarea.value = code;
+  drawCanvas();
+});
+
+edit.addEventListener("click", function() {
+  textarea.focus();
+})
+
+textarea.addEventListener("input", drawCanvas);
+window.addEventListener("load", drawCanvas);
+
+
+ +

{{ EmbedLiveSample('Playable_code', 700, 360) }}

+ +

Specifiche

+ + + + + + + + + + + + + + +
SpecificaStatoCommenti
{{SpecName('HTML WHATWG', "scripting.html#dom-context-2d-ispointinpath", "CanvasRenderingContext2D.isPointInPath")}}{{Spec2('HTML WHATWG')}} 
+ +

Compatibilità Browser

+ +

{{ CompatibilityTable() }}

+ +
+ + + + + + + + + + + + + + + + + + + + + + + + + + + +
CaratteristicaChromeFirefox (Gecko)Internet ExplorerOperaSafari
Supporto base{{ CompatVersionUnknown() }}{{ CompatVersionUnknown() }}{{ CompatVersionUnknown() }}{{ CompatVersionUnknown() }}{{ CompatVersionUnknown() }}
Parametro path{{ CompatVersionUnknown() }}{{ CompatGeckoDesktop(31) }}{{ CompatNo }}{{ CompatVersionUnknown() }}{{ CompatNo }}
+
+ +
+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
CaratteristicaAndroidChrome for AndroidFirefox Mobile (Gecko)IE MobileOpera MobileSafari Mobile
Supporto base{{ CompatVersionUnknown() }}{{ CompatVersionUnknown() }}{{ CompatVersionUnknown() }}{{ CompatVersionUnknown() }}{{ CompatVersionUnknown() }}{{ CompatVersionUnknown() }}
Parametro path{{ CompatUnknown() }}{{ CompatUnknown() }}{{ CompatGeckoMobile(31) }}{{ CompatUnknown() }}{{ CompatUnknown() }}{{ CompatUnknown() }}
+
+ +

Note di compatibilità

+ + + +

Vedi anche

+ + -- cgit v1.2.3-54-g00ecf