@drizm/ng-whiteboard
Version:
A Canvas component for Angular which supports free drawing.
79 lines • 13.7 kB
JavaScript
import { Component, Output, EventEmitter, ViewChild, ElementRef, Input, HostListener } from '@angular/core';
export class CanvasWhiteboardColorPickerComponent {
constructor(elementRef) {
this.elementRef = elementRef;
this.selectedColor = 'rgba(0,0,0,1)';
this.showColorPicker = false;
this.toggleColorPicker = new EventEmitter();
this.colorSelected = new EventEmitter();
this.secondaryColorSelected = new EventEmitter();
}
closeOnExternalClick(event) {
if (!this.elementRef.nativeElement.contains(event.target) && this.showColorPicker) {
this.toggleColorPicker.emit(false);
}
}
/**
* Initialize the canvas drawing context. If we have an aspect ratio set up, the canvas will resize
* according to the aspect ratio.
*/
ngOnInit() {
this._context = this.canvas.nativeElement.getContext('2d');
this.createColorPalette();
}
createColorPalette() {
let gradient = this._context.createLinearGradient(0, 0, this._context.canvas.width, 0);
gradient.addColorStop(0, 'rgb(255, 0, 0)');
gradient.addColorStop(0.15, 'rgb(255, 0, 255)');
gradient.addColorStop(0.33, 'rgb(0, 0, 255)');
gradient.addColorStop(0.49, 'rgb(0, 255, 255)');
gradient.addColorStop(0.67, 'rgb(0, 255, 0)');
gradient.addColorStop(0.84, 'rgb(255, 255, 0)');
gradient.addColorStop(1, 'rgb(255, 0, 0)');
this._context.fillStyle = gradient;
this._context.fillRect(0, 0, this._context.canvas.width, this._context.canvas.height);
gradient = this._context.createLinearGradient(0, 0, 0, this._context.canvas.height);
gradient.addColorStop(0, 'rgba(255, 255, 255, 1)');
gradient.addColorStop(0.5, 'rgba(255, 255, 255, 0)');
gradient.addColorStop(0.5, 'rgba(0, 0, 0, 0)');
gradient.addColorStop(1, 'rgba(0, 0, 0, 1)');
this._context.fillStyle = gradient;
this._context.fillRect(0, 0, this._context.canvas.width, this._context.canvas.height);
}
doToggleColorPicker(event) {
if (event) {
event.preventDefault();
}
this.toggleColorPicker.emit(!this.showColorPicker);
}
determineColorFromCanvas(event) {
const canvasRect = this._context.canvas.getBoundingClientRect();
const imageData = this._context.getImageData(event.clientX - canvasRect.left, event.clientY - canvasRect.top, 1, 1);
return `rgba(${imageData.data[0]}, ${imageData.data[1]}, ${imageData.data[2]}, ${imageData.data[3]})`;
}
selectColor(color) {
this.colorSelected.emit(color);
this.doToggleColorPicker(null);
}
}
CanvasWhiteboardColorPickerComponent.decorators = [
{ type: Component, args: [{
selector: 'canvas-whiteboard-colorpicker',
template: "<div [hidden]=\"showColorPicker\" class=\"canvas-whiteboard-colorpicker-input\"\r\n (click)=\"doToggleColorPicker($event)\">\r\n <div class=\"selected-color-type-wrapper\">{{previewText}}</div>\r\n <div class=\"selected-color-preview\" [style.background]=\"selectedColor\"></div>\r\n</div>\r\n<div [hidden]=\"!showColorPicker\" class=\"canvas-whiteboard-colorpicker-wrapper\">\r\n <div (click)=\"selectColor('transparent')\" class=\"transparent-color\">Transparent</div>\r\n <canvas #canvaswhiteboardcolorpicker class=\"canvas-whiteboard-colorpicker\" width=\"284\" height=\"155\"\r\n (click)=\"selectColor(determineColorFromCanvas($event))\"></canvas>\r\n</div>\r\n",
styles: [".selected-color-preview{width:100%;height:20%;position:absolute;bottom:0;left:0}.selected-color-type-wrapper{display:inline-block;height:100%;width:100%;text-align:center;font-size:14px;color:#000}.transparent-color{font-size:14px}.canvas-whiteboard-colorpicker-wrapper{border:1px solid #afafaf;color:#000}@media (min-width:401px){.canvas-whiteboard-colorpicker-wrapper{position:absolute}}.canvas-whiteboard-colorpicker-input{display:inline-block;position:relative;width:44px;height:44px;margin:5px;cursor:pointer;color:#000}"]
},] }
];
CanvasWhiteboardColorPickerComponent.ctorParameters = () => [
{ type: ElementRef }
];
CanvasWhiteboardColorPickerComponent.propDecorators = {
previewText: [{ type: Input }],
selectedColor: [{ type: Input }],
canvas: [{ type: ViewChild, args: ['canvaswhiteboardcolorpicker', { static: true },] }],
showColorPicker: [{ type: Input }],
toggleColorPicker: [{ type: Output }],
colorSelected: [{ type: Output }],
secondaryColorSelected: [{ type: Output }],
closeOnExternalClick: [{ type: HostListener, args: ['document:touchstart', ['$event'],] }, { type: HostListener, args: ['document:mousedown', ['$event'],] }]
};
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If we have an aspect ratio set up, the canvas will resize\r\n   * according to the aspect ratio.\r\n   */\r\n  ngOnInit(): void {\r\n    this._context = this.canvas.nativeElement.getContext('2d');\r\n    this.createColorPalette();\r\n  }\r\n\r\n  createColorPalette(): void {\r\n    let gradient = this._context.createLinearGradient(0, 0, this._context.canvas.width, 0);\r\n    gradient.addColorStop(0, 'rgb(255, 0, 0)');\r\n    gradient.addColorStop(0.15, 'rgb(255, 0, 255)');\r\n    gradient.addColorStop(0.33, 'rgb(0, 0, 255)');\r\n    gradient.addColorStop(0.49, 'rgb(0, 255, 255)');\r\n    gradient.addColorStop(0.67, 'rgb(0, 255, 0)');\r\n    gradient.addColorStop(0.84, 'rgb(255, 255, 0)');\r\n    gradient.addColorStop(1, 'rgb(255, 0, 0)');\r\n    this._context.fillStyle = gradient;\r\n    this._context.fillRect(0, 0, this._context.canvas.width, this._context.canvas.height);\r\n\r\n    gradient = this._context.createLinearGradient(0, 0, 0, this._context.canvas.height);\r\n    gradient.addColorStop(0, 'rgba(255, 255, 255, 1)');\r\n    gradient.addColorStop(0.5, 'rgba(255, 255, 255, 0)');\r\n    gradient.addColorStop(0.5, 'rgba(0, 0, 0, 0)');\r\n    gradient.addColorStop(1, 'rgba(0, 0, 0, 1)');\r\n    this._context.fillStyle = gradient;\r\n    this._context.fillRect(0, 0, this._context.canvas.width, this._context.canvas.height);\r\n  }\r\n\r\n  doToggleColorPicker(event: Event | null): void {\r\n    if (event) {\r\n      event.preventDefault();\r\n    }\r\n\r\n    this.toggleColorPicker.emit(!this.showColorPicker);\r\n  }\r\n\r\n  determineColorFromCanvas(event: any): string {\r\n    const canvasRect = this._context.canvas.getBoundingClientRect();\r\n    const imageData = this._context.getImageData(event.clientX - canvasRect.left,\r\n      event.clientY - canvasRect.top, 1, 1);\r\n\r\n    return `rgba(${imageData.data[0]}, ${imageData.data[1]}, ${imageData.data[2]}, ${imageData.data[3]})`;\r\n  }\r\n\r\n  selectColor(color: string): void {\r\n    this.colorSelected.emit(color);\r\n    this.doToggleColorPicker(null);\r\n  }\r\n}\r\n"]}