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HTML

              
                <color-chooser></color-chooser>
              
            
!

CSS

              
                .base-colors li { float: left; padding: 5px; margin: 0px; border: solid 2px white;}
.base-colors {list-style: none;}
.clear {clear: both;}

.final-colors li { float: left; padding: 5px; margin: 0px; width: 40px;border: solid 2px white;}
.final-colors {list-style: none; width: 330px;}

.final {
	width: 100px;
	height: 100px;
	margin: 40px;
}

li.selected  {
	border: solid 2px black;
}

              
            
!

JS

              
                import {Component} from "//unpkg.com/can@5/core.mjs";
Component.extend({
	tag: "color-chooser",
	view: `
		<div>Click to lock base color 
			<span style="{{ this.colorStyle(this.baseOrSuggestedColor) }}">
				{{ this.printShortColor(this.baseOrSuggestedColor) }}
			</span>
		</div>
		<ul class='base-colors'>
			{{# for(color of this.baseColors) }}
				<li style="{{ this.colorStyle(color) }}" 
					on:click="this.selectBaseColor(color)"
					on:mouseenter="this.suggestBaseColor(color)"
					{{# eq(color, baseColor) }}class='selected'{{/ eq }}>
					R{{color.red}}<br/>
					G{{color.green}}<br/>
					B{{color.green}}
				</li>
			{{/for}}
		</ul>
		<div class='clear'>
			Click to lock final color
			<span style="{{ colorStyle(this.finalOrBaseOrSuggestedColor) }}">
				{{ printShortColor(this.finalOrBaseOrSuggestedColor) }}
			</span>
		</div>
		<ul class='final-colors'>
			{{# for(color of this.finalColors) }}
				<li style="{{ colorStyle(color) }}" 
					on:click="selectFinalColor(color)"
					on:mouseenter="suggestFinalColor(color)"
					{{#eq(color,this.finalColor)}}class='selected'{{/eq}}>
					R{{color.red}}<br/>
					G{{color.green}}<br/>
					B{{color.green}}
				</li>
			{{/ for }}
		</ul>
		<div class='final clear' 
			style="{{ this.colorStyle(this.finalOrBaseOrSuggestedColor) }}">
			FINAL COLOR
			{{ this.printShortColor(this.finalOrBaseOrSuggestedColor) }}
		</div>
	`,
	ViewModel: {
		// STATEFUL PROPS
		baseCols: {default: 19},
		suggestedBaseColor: "any",
		baseColor: "any",
		
		suggestedFinalColor: "any",
		finalColor: "any",
		
		// DERIVED VALUES
		get baseColors(){
			const sinFreq = .3;
			const greenPhase = 2 * Math.PI / 3;
			const bluePhase = 4 * Math.PI / 3;
			const sineWidth = 127;
			const sineCtr = 128;
			const colors = [];
			for (let j = 0; j < this.baseCols; ++j) {
				var red = Math.round(Math.sin(sinFreq * j + 0) * sineWidth + sineCtr);
				var green = Math.round(Math.sin(sinFreq * j + greenPhase) * sineWidth + sineCtr);
				var blue = Math.round(Math.sin(sinFreq * j + bluePhase) * sineWidth + sineCtr);
				colors.push({red, green, blue})
			}
			return colors;
		},
		get lastBaseColor(){
			return this.baseColors[this.baseColors.length-1];
		},
		
		get baseOrSuggestedColor(){
			return this.baseColor || this.suggestedBaseColor || this.lastBaseColor;
		},
		get finalOrBaseOrSuggestedColor(){
			return this.finalColor || this.suggestedFinalColor || this.baseOrSuggestedColor;
		},
		get finalColors() {
			var baseOrSuggestedColor = this.baseOrSuggestedColor;
			var cols = 6;
			var finalColors = [];
			for(var c = 0; c < cols; c++) {
				for(var r = 0 ; r < cols; r++) {
					let xOffset = 3 - c;    // How far am I from grid center?
					let yOffset = 3 - r;
					// Purely empirical way of getting a useful range:
					let red = baseOrSuggestedColor.red + xOffset * 19 + yOffset * 43;
					let green = baseOrSuggestedColor.green + xOffset * 19 + yOffset * 43;
					let blue = baseOrSuggestedColor.blue + xOffset * 19 + yOffset * 43;
					red = red > 255 ? 255 : red < 1 ? 0 : red;
					green = green > 255 ? 255 : green < 1 ? 0 : green;
					blue = blue > 255 ? 255 : blue < 1 ? 0 : blue;
					finalColors.push({red, green, blue})
				}
			}
			return finalColors;
		},
		// HELPER METHODS
		colorStyle(color){
			return `background-color: rgb(${color.red},${color.green},${color.blue});`
		},
		printShortColor(color) {
			return `${color.red},${color.green},${color.blue}`;
		},
		
		// METHODS THAT CHANGE STATE
		suggestBaseColor(color) {
			this.suggestedBaseColor = color;
		},
		selectBaseColor(color) {
			this.baseColor = color;
			// There's less imperitive ways of doing this
			this.suggestedFinalColor = null;
			this.finalColor = null;
		},
		suggestFinalColor(color) {
			this.suggestedFinalColor = color;
		},
		selectFinalColor(color) {
			this.finalColor = color;
		}
	}
});

              
            
!
999px

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