Added colors to tasks

src/models/task.js

@@ -29,6 +29,14 @@ export default class TaskModel extends AbstractModel {
 		this.labels = this.labels.map(l => {
 			return new LabelModel(l)
 		})
+
+		// Set the default color
+		if (this.hexColor === '') {
+			this.hexColor = '198CFF'
+		}
+		if (this.hexColor.substring(0, 1) !== '#') {
+			this.hexColor = '#' + this.hexColor
+		}
 	}
 	
 	defaults() {
@@ -48,7 +56,8 @@ export default class TaskModel extends AbstractModel {
 			reminderDates: [],
 			subtasks: [],
 			parentTaskID: 0,
-			
+			hexColor: '',
+
 			createdBy: UserModel,
 			created: 0,
 			updated: 0,
@@ -101,4 +110,23 @@ export default class TaskModel extends AbstractModel {
 			}
 		}
 	}
+
+	/**
+	 * Checks if the hexColor of a task is dark.
+	 * @returns {boolean}
+	 */
+	hasDarkColor() {
+		if (this.hexColor === '#') {
+			return true // Defaults to dark
+		}
+
+		let rgb = parseInt(this.hexColor.substring(1, 7), 16);   // convert rrggbb to decimal
+		let r = (rgb >> 16) & 0xff;  // extract red
+		let g = (rgb >>  8) & 0xff;  // extract green
+		let b = (rgb >>  0) & 0xff;  // extract blue
+
+		// luma will be a value 0..255 where 0 indicates the darkest, and 255 the brightest
+		let luma = 0.2126 * r + 0.7152 * g + 0.0722 * b; // per ITU-R BT.709
+		return luma > 128
+	}
 }