TRANSFORM ROTATE FREE

Here's the method: RotateDegrees (degrees, px, py) Now the text rotates around the point used to position the text, which is the horizontal center of the text's baseline:Īs with the centered version of the Scale method, the centered version of the RotateDegrees call is a shortcut. The Centered Rotate page is just like the Basic Rotate except that the expanded version of the RotateDegrees is used to set the center of rotation to the same point used to position the text: using (SKPaint textPaint = new SKPaintĬanvas.RotateDegrees((float)rotateSlider.Value, info.Width / 2, info.Height / 2) Public void RotateRadians (Single radians, Single px, Single py) Very often you'll want to rotate something centered around a specified pivot point using these versions of the RotateDegrees and RotateRadians methods: public void RotateDegrees (Single degrees, Single px, Single py)

Here's the relevant part of the PaintSurface handler: using (SKPaint textPaint = new SKPaintĬanvas.RotateDegrees((float)rotateSlider.Value) Ĭanvas.DrawText(Title, info.Width / 2, info.Height / 2, textPaint) īecause rotation is centered around the upper-left corner of the canvas, for most angles set in this program, the text is rotated off the screen: The file displays some text with its baseline centered on the page and rotates it based on a Slider with a range of –360 to 360. The Basic Rotate page demonstrates the RotateDegrees method. For an angle of α, the transform formulas are:

The transform formulas for rotation are more complex than those for translate and scale. (Although rotation on the Cartesian coordinate system is counter-clockwise by convention, clockwise rotation is consistent with Y coordinates increasing going down as in SkiaSharp.) Negative angles and angles greater than 360 degrees are allowed. Rotation is clockwise for increasing angles. Public Void RotateRadians (Single radians)Ī circle of 360 degrees is the same as twoπ radians, so it's easy to convert between the two units.

TRANSFORM ROTATE FREE

With the rotate transform, SkiaSharp graphics objects break free of the constraint of alignment with the horizontal and vertical axes:įor rotating a graphical object around the point (0, 0), SkiaSharp supports both a RotateDegrees method and a RotateRadians method: public void RotateDegrees (Single degrees) If given a number, the value is used for all bands respectively.Explore the effects and animations possible with the SkiaSharp rotate transform Pixel fill value for the area outside the transformed Note that the expand flag assumes rotation around the center and no translation.Ĭenter ( sequence, optional) – Optional center of rotation. If false or omitted, make the output image the same size as the input image. If true, expands the output image to make it large enough to hold the entire rotated image. Please use InterpolationMode enum.Įxpand ( bool, optional) – Optional expansion flag. ) are still accepted,īut deprecated since 0.13 and will be removed in 0.15. If input is Tensor, only InterpolationMode.NEAREST, InterpolationMode.BILINEAR are supported.įor backward compatibility integer values (e.g. Interpolation ( InterpolationMode) – Desired interpolation enum defined by Img ( PIL Image or Tensor) – image to be rotated.Īngle ( number) – rotation angle value in degrees, counter-clockwise. To have shape, where … means an arbitrary number of leading dimensions. If the image is torch Tensor, it is expected rotate ( img : Tensor, angle : float, interpolation : InterpolationMode = InterpolationMode.NEAREST, expand : bool = False, center : Optional ] = None, fill : Optional ] = None, resample : Optional = None ) → Tensor ¶

Transform rotate