imaging

func Clone ¶

func Clone(img image.Image) *image.NRGBA

Clone returns a copy of the given image.

func Crop ¶

func Crop(img image.Image, rect image.Rectangle) *image.NRGBA

Crop cuts out a rectangular region with the specified bounds from the image and returns the cropped image.

func CropAnchor ¶

func CropAnchor(img image.Image, width, height int, anchor Anchor) *image.NRGBA

CropAnchor cuts out a rectangular region with the specified size from the image using the specified anchor point and returns the cropped image.

func CropCenter ¶

func CropCenter(img image.Image, width, height int) *image.NRGBA

CropCenter cuts out a rectangular region with the specified size from the center of the image and returns the cropped image.

func FlipH ¶

func FlipH(img image.Image) *image.NRGBA

FlipH flips the image horizontally (from left to right) and returns the transformed image.

func FlipV ¶

func FlipV(img image.Image) *image.NRGBA

FlipV flips the image vertically (from top to bottom) and returns the transformed image.

func New ¶

func New(width, height int, fillColor color.Color) *image.NRGBA

New creates a new image with the specified width and height, and fills it with the specified color.

func Overlay ¶

func Overlay(background, img image.Image, pos image.Point, opacity float64) *image.NRGBA

Overlay draws the img image over the background image at given position and returns the combined image. Opacity parameter is the opacity of the img image layer, used to compose the images, it must be from 0.0 to 1.0.

Usage examples:

// Draw spriteImage over backgroundImage at the given position (x=50, y=50).
dstImage := imaging.Overlay(backgroundImage, spriteImage, image.Pt(50, 50), 1.0)

// Blend two opaque images of the same size.
dstImage := imaging.Overlay(imageOne, imageTwo, image.Pt(0, 0), 0.5)

func OverlayCenter ¶

func OverlayCenter(background, img image.Image, opacity float64) *image.NRGBA

OverlayCenter overlays the img image to the center of the background image and returns the combined image. Opacity parameter is the opacity of the img image layer, used to compose the images, it must be from 0.0 to 1.0.

func Paste ¶

func Paste(background, img image.Image, pos image.Point) *image.NRGBA

Paste pastes the img image to the background image at the specified position and returns the combined image.

func PasteCenter ¶

func PasteCenter(background, img image.Image) *image.NRGBA

PasteCenter pastes the img image to the center of the background image and returns the combined image.

func Rotate ¶

func Rotate(img image.Image, angle float64, bgColor color.Color) *image.NRGBA

Rotate rotates an image by the given angle counter-clockwise . The angle parameter is the rotation angle in degrees. The bgColor parameter specifies the color of the uncovered zone after the rotation.

func Rotate180 ¶

func Rotate180(img image.Image) *image.NRGBA

Rotate180 rotates the image 180 degrees counter-clockwise and returns the transformed image.

func Rotate270 ¶

func Rotate270(img image.Image) *image.NRGBA

Rotate270 rotates the image 270 degrees counter-clockwise and returns the transformed image.

func Rotate90 ¶

func Rotate90(img image.Image) *image.NRGBA

Rotate90 rotates the image 90 degrees counter-clockwise and returns the transformed image.

func Transpose ¶

func Transpose(img image.Image) *image.NRGBA

Transpose flips the image horizontally and rotates 90 degrees counter-clockwise.

func Transverse ¶

func Transverse(img image.Image) *image.NRGBA

Transverse flips the image vertically and rotates 90 degrees counter-clockwise.