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Canvas Builder, Image Filter

Package Exports

  • ness-canvas
  • ness-canvas/lib/index.js

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (ness-canvas) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

Ness-Canvas 2.5.3

Ness-Canvas is a small canvas Builder for Canvas.

Inslallation

$ npm install ness-canvas

If you are not used to canvas, the latter can request a specific installation that you will find here

Quick Example

const { NessBuilder } = require('ness-canvas')
const { loadImage } = require('canvas')

const background = await loadImage('https://media.discordapp.net/attachments/1006600590408818810/1006600665298116728/background-3147808.jpg');
const avatar = await loadImage('https://media.discordapp.net/attachments/758031322244710601/1000153437813616650/perso_anime_U565bW7EhY2InkF.png');
const builder = new NessBuilder(700, 250);

const gradient = builder.context.createLinearGradient(25, 25, 185 , 185  );
const gradient2 = builder.context.createLinearGradient(25, 200, 660 , 130);

gradient.addColorStop(0, 'red');
...
gradient2.addColorStop(0, 'red');
...

builder.setCornerRadius(15)
  .setBackground(background)
  .setAxis("BottomRight")
  .setFrame("Square", { x: 25, y: 25, size: 80 }, { type: "Image", content: avatar, color: gradient, lineWidth: 5 })
  .setFrame("Hexagon", { x: 520, y: 25, size: 80, rotate: 90 }, { type: "Text", content: "33", color: "Black", textOptions: { size: 50 } })
  .setExp({ x: 40, y: 200, width: 620, height: 30, radius: 15 }, 50, { outlineColor1: gradient2, outlineColor2: "HotPink", color2: "Plum" })
  .setText('Hello World!', {x:250, y:100}, {size: 40, font: '*Impact'})
  .generatedTo('.', "test", "png");

// Generate canvas in a specific file
builder.generateTo('FileLocation', 'ImageName', "PNG | JPEG | JPG")

// Recover the canvas buffer
Builder.getBuffer()

// Add a filter to an image

const filter = new FilterBuilder(avatar);
await filter.Invert();
  
new NessBuilder(avatar.width, avatar.height)
  .setCornerRadius(15)
  .setBackground(filter.getCanvas())
  .generatedTo("src/test/", "testFilter", "png");

Result

NessBuilder

FilterBuilder && NessBuilder

Documentation

This project is an implementation of the Canvas module. For more on the latter visit the Canvas Module Guide. All utility methods are documented below.

The filter builder has documentation specifying all filters you find here.

⚠️ Gif Builder has been move in a external package you can find here
⚠️ You can also find an example of using the Gif Builder here

GifBuilder

Builder

Methods

Types

NessBuilder()

NessBuilder(width: number, height: number) => Builder

Creates a Canvas instance. This method works in Node.js.

Description
  • width: Specifies the width of the element in pixels
  • height: Specify the height of the element in pixels
Example 
const { NessBuilder } = require('ness-canvas')
const builder = new NessBuilder(250, 300)

context

context => CanvasRenderingContext2D

Canvas context.

Description

Give access to Node Canvas context methods

Example 
const { NessBuilder } = require('ness-canvas')
const builder = new NessBuilder(250, 300)

builder.context.beginPath()...
builder.context.moveTo...
...
builder.context.clip...
builder.context.closePath...
builder.context.fill...

setCornerRadius()

setCornerRadius(radius: number, outline?: number, color?: CustomColor) => this

Type definition CustomColor

Round the edges of the canvas

Description
  • radius: Rounded the edges of the canvas
  • outline: ouline size (default 3)
  • color: outline color (default white)
Example 
const { NessBuilder } = require('ness-canvas')
const builder = new NessBuilder(250, 300)

builder.setCornerRadius(15)

setBackground()

setBackground(imageColor: CanvasImage | CustomColor): this;

Type definition CanvasImage | CustomColor

Replaces the space of the canvas with an image, a plain color or a degrader

Description
  • imageColor: Define the type and background to use (Valid syntaxes: #hex(a) | rgb(a) | colorName | CanvasGradient | CanvasPattern)
Example 
const { NessBuilder } = require('ness-canvas')
const { loadImage } = require('canvas')

const builder = new NessBuilder(400, 200)
const img = await loadImage("./assets/image/background/color-2174052.png");

const patern = builder.context.createPattern(img, "repeat");
const linGradient = builder.context.createLinearGradient(0, 0, 400, 0);
const radGradient = builder.context.createRadialGradient(200, 100, 75, 200, 100, 200);

linGradient.addColorStop(...);
radGradient.addColorStop(...);

builder.setBackground(img);
builder.setBackground("Coral");
builder.setBackground("#ff0000");
builder.setBackground("rgb(155, 135, 85)");
builder.setBackground("rgba(155, 135, 85, 0.5)");
builder.setBackground(linGradient);
builder.setBackground(radGradient);
builder.setBackground(patern); // Patern have a bug where he just zoom upper left corner so don't use it

setAxis()

setBackground(imageColor: CanvasImage | CustomColor): this;

Type definition CanvasImage | CustomColor

Replaces the space of the canvas with an image, a plain color or a degrader

Description
  • imageColor: Define the type and background to use (Valid syntaxes: #hex(a) | rgb(a) | colorName | CanvasGradient | CanvasPattern)
Example 
const { NessBuilder } = require('ness-canvas')
const { loadImage } = require('canvas')

const builder = new NessBuilder(400, 200)
const img = await loadImage("./assets/image/background/color-2174052.png");

const patern = builder.context.createPattern(img, "repeat");
const linGradient = builder.context.createLinearGradient(0, 0, 400, 0);
const radGradient = builder.context.createRadialGradient(200, 100, 75, 200, 100, 200);

linGradient.addColorStop(...);
radGradient.addColorStop(...);

builder.setBackground(img);
builder.setBackground("Coral");
builder.setBackground("#ff0000");
builder.setBackground("rgb(155, 135, 85)");
builder.setBackground("rgba(155, 135, 85, 0.5)");
builder.setBackground(linGradient);
builder.setBackground(radGradient);
builder.setBackground(patern); // Patern have a bug where he just zoom upper left corner so don't use it

setFont()

setFont(name: string, size?: number): this

Change Font used

Description
  • name: System font name
  • size: Font default size

    Also works with registerFont, but it is still advisable to install the fonts directly in your operating system because registerFont does not work for everyone.

Example 
const { NessBuilder } = require('ness-canvas')
const builder = new NessBuilder(250, 300)

builder.setFont("Sketch Gothic School", 50)

.setFrame("Square", { location:{x: 350, y: 125}, size: 50, Quadrilateral: { radius: 0}, outline: { size: 2, color: "Aquamarine"} }, { type: "Text", content: "Hellow world", text: { color: "Brown"}})
...
.setFont("Arial", 15)
.setText(...)
...

setText()

setText(text: string, coordinate: {x: number, y: number}, option?: Text) => this

Type definition Text

Writes text in the canvas

Description

  • text: Text to write

  • coordinate: Location to write text
    • x: location of text on axis x
    • y: location of text on axis y
  • option: Adjust text configuration
    • size: Text size
    • font?: Change font to use, add * for use font system (*Arial, *Calibri, ...)
    • color?: Text color (Valid syntaxes: #hex(a) | rgb(a) | colorName | CanvasGradient | CanvasPattern)
    • backgroundColor?: Background color (Valid syntaxes: #hex(a) | rgb(a) | colorName | CanvasGradient | CanvasPattern)
    • stroke?: Write text with no fill
    • textAlign?: Align the text on the vertical axis
    • textBaseline?: Align the text on the horizontal axis

      The use of * for font is intended for future addition not yet implemented

    • Example 
    const { NessBuilder } = require('ness-canvas')
const builder = new NessBuilder(250, 300)

builder.setText("Hello World", { x: 62, y: 150 }, { font: "sans-serif", size: 80, color: "#000000", textAlign: "center", textBaseline: "middle" })

    setImage()

    setImage(image: CanvasImage, imageOption: ImagelocationOption, locationOption?: DrawlocationOption): this;

    Type definition CanvasImage

    Draw an image or a Canvas to S coordinates with D dimensions

    Description

    • image: Image after use LoadImage from Node-Canvas or a Canvas (Patern and Gradiant Not supported)

    • imageOption: Source image coordinates to draw in the context of Canvas
      • sx: Coordinate X in the destination canvas (upper left corner of the source image)
      • sy: Coordinate Y in the destination canvas (upper left corner of the source image)
      • sWidth?: Width of the image drawn in the Canvas
      • sHeight?: Height of the image drawn in the Canvas

        sWidth & sHeight This allows you to adjust the size of the image. If this argument is not specified, the image will take its normal whidth or height

    • locationOption?: Modify image coordinates to draw in the context of Canvas
      • dx: Coordinate X from image source to draw in the canvas (upper left corner)
      • dy: Coordinate Y from image source to draw in the canvas (upper left corner)
      • dWidth?: Width of the image Modify (imageOption) to draw in the canvas
      • dHeight?: Height of the image Modify (imageOption) to draw in the canvas
    Example 
    const { NessBuilder } = require('ness-canvas')
const { loadImage } = require('canvas')

const builder = new NessBuilder(250, 300)
const image = await loadImage('./assets/image/background/color-2174052.png')

builder.setImage(image, {sx: 25, sy: 25, sWidth: 100, sHeight: 75});

builder.setImage(image, {sx: 25, sy: 25, sWidth: 100, sHeight: 75}, {dx: 0, dy: 25, dWidth: 200, dHeight: 150});

    setFrame()

    setFrame<T extends FrameType, S extends Shape>(shape: S, frame: Frame<S>, content: Content<T>): this;

    Draw a frame containing an image, a text or a color

    Description

    • shape: Shape of your frame (Square/Circle/...)

    • frame: Frame positioning in Canvas
      • location: Frame location in Canvas
        • x: Frame location on axis x
        • y: Frame location on axis y

    • size: Frame size

    • outline: Frame ouline parameter
      • size: Frame Outline Size
      • color: Frame Outline Color (Valid syntaxes: #hex(a) | rgb(a) | colorName | CanvasGradient | CanvasPattern)

  • rotate?: Frame Rotation

  • Quadrilateral?: Option for the square and the rectangle shape
    • radius: Corner Radius
    • width: Replace Size parameter for axis x
    • height: Replace Size parameter for axis y

    width & height is used for the rectangle shape

    • Quadrilateral Additional parameter for the square and Rectangle of shape

  • content: Modify Frame property

    • type: Specifies the type of content to use

    • content: Frame content (Image | Gradiant | Patern | Text)

    • text?: Modify Text property (not used if type is not of type Text and content is not a text or a number)
      • size: Text size
      • color?: Text color (Valid syntaxes: #hex(a) | rgb(a) | colorName | CanvasGradient | CanvasPattern)
      • backgroundColor?: Background color (Valid syntaxes: #hex(a) | rgb(a) | colorName | CanvasGradient | CanvasPattern)
      • stroke?: Write text with no fill
      • textAlign?: Align the text on the vertical axis
      • textBaseline?: Align the text on the horizontal axis
    • Example 
    const { NessBuilder } = require('ness-canvas')
const { loadImage } = require('canvas')

const builder = new NessBuilder(250, 300)
const image = await loadImage('./assets/image/background/color-2174052.png')
const linGradient = builder.context.createLinearGradient(0, 0, 240, 0);

builder.setFrame("Pentagon", { location: { x: 100, y: 100 }, size: 80 }, { type: "Color", content: "Coral", color: "Blue" })

builder.setFrame("Square", { location: { x: 10, y: 10 }, size: 50 }, { type: "Empty", content: "Empty", color: "Blue" })

linGradient.addColorStop(...)

builder.setFrame("Square", { location: { x: 220, y: 165 }, size: 50 }, { type: "Text", content: "linGrad I am out context but not my color gradiant", color: "Blue", text: { size: 20, color: linGradient, backgroundColor: "White" } })

    setExp()

    setExp(exp: Experience, progress: IntRange<0, 101>, color?: ExperienceColor) => this

    Type definition IntRange

    Draws a bar that can act as an experience bar

    Description
    • exp: Experience bar positioning in Canvas
      • location: Experience bar location in Canvas
        • x: Experience bar location on axis x
        • y: Experience bar location on axis y
    • size: Experience bar location in Canvas
      • Width: Width of the Experience bar
      • Height: Height of the Experience bar
  • rotate?: Pivot the Experience bar to a certain degree
  • radius?: Round the edge

  • progress: Progress of filling from 0% to 100%

  • color?: Adjust Bar color
    • backColor: Color of the bar in the background
    • color: Filling bar color
    • outlineColor: Color of the contour of the bar in the background
    • backOutlineColor: Contour color of the filling bar
    • transparency?: Background transparency

      Valid syntaxes: #hex(a) | rgb(a) | colorName | CanvasGradient | CanvasPattern

    • Example 
    const { NessBuilder } = require('ness-canvas')
const builder = new NessBuilder(250, 300)

builder.setExp({ location: { x: 30, y: 30 }, size: { width: 400, height: 30 }, radius: 10, rotate: 90 }, 50)

builder.setExp({ location: { x: 30, y: 30 }, size: { width: 400, height: 30 } }, 50, { backColor: "Red", backOutlineColor: "Coral" })

    setLoading()

    setLoading<D extends ShapeLoad, S extends Shape>(shape: Shape, option: LoadingOption<D, S>): this
    Description

    • shape: Frame shape (Square/Circle/Polygone...)

    • option: FrameLoading positioning in Canvas.

      • x: Frame location on axis x

      • y: Frame location on axis y

      • size: Frame size

      • rotate?: Frame Rotation

      • fill: Modify the filling parameters
        • type: Filling type (linear or hourly)
        • start: Only for hourly filling type (Default start to 12h)

      • color: Frame content Color (Valid syntaxes: #hex(a) | rgb(a) | colorName | CanvasGradient | CanvasPattern)

      • progress: Progress of filling from 0% to 100%

      • outline: Modify Outline parameters
        • widht: line size
        • color: line color (Valid syntaxes: #hex(a) | rgb(a) | colorName | CanvasGradient | CanvasPattern)
    • QuadrilateralOption?: Option for the square and the rectangle shape
      • radius: Corner Radius
      • width: Replace Size parameter for axis x
      • height: Replace Size parameter for axis y

      width & height is used for the rectangle shape

    Example 
    const { NessBuilder } = require('ness-canvas')
const builder = new NessBuilder(250, 300)

builder.setLoading("Decagon", { x: 300, y: 300, size: 250, fill: { type: "Line" }, color: radGradient, outline: { color: "Green", width: 3 }, progress: 50, QuadrilateralOption: { width: 250, height: 100, radius: 0 } })

    toBuffer()

    toBuffer(ext?: ImageExtention | "raw" | "pdf") => Promise<void>

    Returns a Buffer of the image contained in the canvas (default png format)

    Description
    • ext: Convert Buffer to image extension, pdf or raw format
    Example 
    const { NessBuilder } = require('ness-canvas')
const builder = new NessBuilder(250, 300)

builder.toBuffer()

    generatedTo()

    generatedTo(location: string, name: string, type: ImageExtention) => Promise<void>

    Generates an image of the canvas in a specific path

    Description
    • Location: Generation path
    • name: File name
    • type: Image extension (png, jpg, jpeg, bmp, tif, tiff)
    Example 
    const { NessBuilder } = require('ness-canvas')
const builder = new NessBuilder(250, 300)

builder.generatedTo('src/myFolder/', "name", "png")

    toDataURL()

    toDataURL() => string

    Returns canvas to base64 encoded string

    Example 
    const { NessBuilder } = require('ness-canvas')
const builder = new NessBuilder(250, 300)
...

builder.toDataURL()

    CustomColor

    CanvasImage

    IntRange

    Text