ng-image-canvas

ng-image-canvas is an Angular library that provides a canvas component where users can drag and drop images, move them around, resize them, and remove them. The component supports enabling or disabling editing, and maintains the aspect ratio when resizing with the Shift key.

Installation

To install the library, use the following command:

  npm install ng-image-canvas

Usage

Importing the Module

First, import the NgImageCanvasModule into component

import { Component } from "@angular/core";
import { RouterOutlet } from "@angular/router";
import { NgImageCanvasModule } from "ng-image-canvas";

@Component({
  selector: "app-root",
  standalone: true,
  imports: [RouterOutlet, NgImageCanvasModule],
  templateUrl: "./app.component.html",
  styleUrl: "./app.component.scss",
})
export class AppComponent {}

Using the Component

You can use the ng-image-canvas component in your template as shown below:

<ng-image-canvas
  [width]="800"
  [height]="600"
  [editing]="editingEnabled"
  [resizeHandleSize]="10"
  [resizeHandleColor]="'gray'"
  [closeButtonSize]="20"
  [closeButtonBackgroundColor]="'red'"
  [closeButtonFontColor]="'white'"
  (imagesChange)="onImagesChange($event)"
  #canvasComp
>
</ng-image-canvas>
<button (click)="toggleEditing()">Toggle Editing</button>
<button (click)="logImages()">Log Images</button>
<button (click)="addImage()">Add Image</button>

In your component, you can handle the image changes and control the editing state:

import { Component, ViewChild } from "@angular/core";
import { RouterOutlet } from "@angular/router";
import { DraggableImage, NgImageCanvasModule } from "ng-image-canvas";

@Component({
  selector: "app-root",
  standalone: true,
  imports: [RouterOutlet, NgImageCanvasModule],
  templateUrl: "./app.component.html",
  styleUrls: ["./app.component.css"],
})
export class AppComponent {
  editingEnabled: boolean = true;
  @ViewChild("canvasComp") canvasComp;

  toggleEditing(): void {
    this.editingEnabled = !this.editingEnabled;
  }

  onImagesChange(images: DraggableImage[]): void {
    console.log("Images changed:", images);
  }

  logImages(): void {
    console.log(this.canvasComp.getImages());
  }

  addImage(): void {
    const newImage: DraggableImage = {
      img: new Image(),
      x: 0,
      y: 0,
      width: 100,
      height: 100,
    };
    newImage.img.src = "https://via.placeholder.com/100";
    newImage.img.onload = () => {
      const images = this.canvasComp.getImages();
      images.push(newImage);
      this.canvasComp.setImages(images);
    };
  }
}

Documentation

Inputs

• width: number: The width of the canvas.
• height: number: The height of the canvas.
• editing: boolean: Enables or disables editing. When editing is true, users can move, resize, and remove images.
• resizeHandleSize: number: The size of image resize handle.
• resizeHandleColor: string: The color of image resize handle.
• closeButtonSize: number: Size of image remove button.
• closeButtonBackgroundColor: string: The background color of image remove button
• closeButtonFontColor: string: The color of 'x' on image remove button.

Outputs

• imagesChange: EventEmitter<DraggableImage[]>: Emits the current list of images whenever they are added, moved, resized, or removed.

Methods

• getImages(): DraggableImage[]: Returns the current list of images on the canvas.
• setImages(images: DraggableImage[]): void: Sets the list of images on the canvas and redraws it.

Screenshots

Canvas with Editing Enabled

Canvas with Editing Disabled

License

This project is licensed under the MIT License. See the LICENSE file for more details.

Contributing

Contributions are welcome. You can start by looking at issues or creating new Issue with proposal or bug report.