After cleaning up my response, I have created a straightforward reference implementation for the use case:
- Start with a blank Ionic 3 app: Run `ionic start blank`
- Edit the home.html file on the home page to include:
<ion-header>
<ion-navbar>
<ion-title>
Ionic Blank
</ion-title>
</ion-navbar>
</ion-header>
<ion-content padding>
Below is Home Page's 320px*320px canvas:
<canvas #homepagecanvas></canvas>
</ion-content>
- Add the following code snippet to the home.ts file:
import { Component, ViewChild, ElementRef } from '@angular/core';
import { NavController } from 'ionic-angular';
import { CanvasProviderService } from '../../providers/canvasProvider';
@Component({
selector: 'page-home',
templateUrl: 'home.html'
})
export class HomePage {
@ViewChild('homepagecanvas') homepagecanvas: ElementRef;
private homePageCanvasCtx: any;
constructor(
public navCtrl: NavController,
private canvasProvider: CanvasProviderService
) {
}
ionViewDidLoad() {
this.homePageCanvasCtx = this.homepagecanvas.nativeElement.getContext('2d');
setTimeout(() => {
this.homePageCanvasCtx.drawImage(this.canvasProvider.canvasRef, 0, 0)
console.log("rendered from provider!")
}, 3000)
}
}
- Integrate the canvasProvider into your project:
import { Injectable } from '@angular/core';
// The image below is used as an example of what you can render on the canvas:
const exampleImage = document.createElement('img');
exampleImage.setAttribute('src', 'https://www.google.com/images/branding/googlelogo/1x/googlelogo_color_272x92dp.png')
exampleImage.setAttribute('width', "120");
exampleImage.setAttribute('height', "120");
@Injectable()
export class CanvasProviderService {
public canvasRef: any;
public canvasCtx: any;
public examplePic: any;
constructor() {
this.canvasRef = document.createElement('canvas');
this.canvasRef.width = 320;
this.canvasRef.height = 320;
this.canvasCtx = this.canvasRef.getContext('2d');
this.examplePic = exampleImage;
this.canvasCtx.drawImage(exampleImage, 0, 0);
}
}
Remember to import and add this provider in your app.module.ts...
Run the app and observe how the Google logo, initially rendered by the provider, can be replicated onto the canvas of your component (page).
The example image serves to demonstrate the concept. You can display any content on this canvas within the provider and have it appear on your page.
If there are any questions or clarifications needed, feel free to reach out.
PS: Usage of "const" and similar blocks in the provider was mainly for experimentation purposes. Assignments can also be done in the constructor or appropriately according to Angular practices.
UPDATE:
It is crucial to pay attention to canvas sizing to prevent cropping issues, as mentioned by Tim in the comments.