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Merged
MindFreeze merged 5 commits into from
Mar 31, 2026
Merged

Gauge improvements #30368

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6b53a6c
Gauge last improvements
silamon Mar 26, 2026
5903e73
Change needle
silamon Mar 27, 2026
7e38ff9
Fixup
silamon Mar 27, 2026
643afd4
Feedback comments
silamon Mar 28, 2026
35b51c9
Update src/components/ha-gauge.ts
MindFreeze Mar 31, 2026
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15 changes: 15 additions & 0 deletions gallery/src/pages/lovelace/gauge-card.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -134,6 +134,21 @@ const CONFIGS = [
entity: sensor.not_working
`,
},
{
heading: "Lower minimum",
config: `
- type: gauge
entity: sensor.brightness_high
needle: true
severity:
green: 0
yellow: 0.45
red: 0.9
min: -0.05
name: " "
max: 1.9
unit: GBP/h`,
},
];

@customElement("demo-lovelace-gauge-card")
Expand Down
203 changes: 117 additions & 86 deletions src/components/ha-gauge.ts
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
import type { PropertyValues, TemplateResult } from "lit";
import type { PropertyValues } from "lit";
import { css, LitElement, svg } from "lit";
import { customElement, property, state } from "lit/decorators";
import { styleMap } from "lit/directives/style-map";
Expand Down Expand Up @@ -54,6 +54,7 @@ export class HaGauge extends LitElement {
this._angle = getAngle(this.value, this.min, this.max);
}
this._segment_label = this._getSegmentLabel();
this._rescaleSvg();
});
}

Expand All @@ -70,6 +71,7 @@ export class HaGauge extends LitElement {
}
this._angle = getAngle(this.value, this.min, this.max);
this._segment_label = this._getSegmentLabel();
this._rescaleSvg();
}

protected render() {
Expand All @@ -88,87 +90,92 @@ export class HaGauge extends LitElement {
/>


${
this.levels
? [...this.levels]
.sort((a, b) => a.level - b.level)
.map((level, i, arr) => {
const startLevel = i === 0 ? this.min : arr[i].level;
const endLevel = i + 1 < arr.length ? arr[i + 1].level : this.max;

const startAngle = getAngle(startLevel, this.min, this.max);
const endAngle = getAngle(endLevel, this.min, this.max);
const largeArc = endAngle - startAngle > 180 ? 1 : 0;

const x1 = -arcRadius * Math.cos((startAngle * Math.PI) / 180);
const y1 = -arcRadius * Math.sin((startAngle * Math.PI) / 180);
const x2 = -arcRadius * Math.cos((endAngle * Math.PI) / 180);
const y2 = -arcRadius * Math.sin((endAngle * Math.PI) / 180);

const firstSegment = i === 0;
const lastSegment = i === arr.length - 1;

const paths: TemplateResult[] = [];

if (firstSegment) {
paths.push(svg`
<path
class="level"
stroke="${level.stroke}"
style="stroke-linecap: round"
d="M ${x1} ${y1} A ${arcRadius} ${arcRadius} 0 ${largeArc} 1 ${x2} ${y2}"
/>
`);
} else if (lastSegment) {
const offsetAngle = 0.5;
const midAngle = endAngle - offsetAngle;
const xm = -arcRadius * Math.cos((midAngle * Math.PI) / 180);
const ym = -arcRadius * Math.sin((midAngle * Math.PI) / 180);

paths.push(svg`
<path
class="level"
stroke="${level.stroke}"
style="stroke-linecap: butt"
d="M ${x1} ${y1} A ${arcRadius} ${arcRadius} 0 ${largeArc} 1 ${xm} ${ym}"
/>
`);

paths.push(svg`
<path
class="level"
stroke="${level.stroke}"
style="stroke-linecap: round"
d="M ${xm} ${ym} A ${arcRadius} ${arcRadius} 0 0 1 ${x2} ${y2}"
/>
`);
} else {
paths.push(svg`
<path
class="level"
stroke="${level.stroke}"
style="stroke-linecap: butt"
d="M ${x1} ${y1} A ${arcRadius} ${arcRadius} 0 ${largeArc} 1 ${x2} ${y2}"
/>
`);
}

return paths;
})
: ""
}
${
this.levels
? (() => {
const sortedLevels = [...this.levels].sort(
(a, b) => a.level - b.level
);

if (
sortedLevels.length > 0 &&
sortedLevels[0].level !== this.min
) {
sortedLevels.unshift({
level: this.min,
stroke: "var(--info-color)",
});
}

return sortedLevels.map((level, i, arr) => {
const startLevel = level.level;
const endLevel =
i + 1 < arr.length ? arr[i + 1].level : this.max;

const startAngle = getAngle(startLevel, this.min, this.max);
const endAngle = getAngle(endLevel, this.min, this.max);
const largeArc = endAngle - startAngle > 180 ? 1 : 0;

const x1 =
-arcRadius * Math.cos((startAngle * Math.PI) / 180);
const y1 =
-arcRadius * Math.sin((startAngle * Math.PI) / 180);
const x2 = -arcRadius * Math.cos((endAngle * Math.PI) / 180);
const y2 = -arcRadius * Math.sin((endAngle * Math.PI) / 180);

const isFirst = i === 0;
const isLast = i === arr.length - 1;
const linecap = "butt";
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if (isFirst) {
return svg`
<path
class="level"
stroke="${level.stroke}"
style="stroke-linecap: butt"
d="M ${x1} ${y1} A ${arcRadius} ${arcRadius} 0 ${largeArc} 1 ${x2} ${y2}"
/>
`;
}

if (isLast) {
const offsetAngle = 0.5;
const midAngle = endAngle - offsetAngle;
const xm =
-arcRadius * Math.cos((midAngle * Math.PI) / 180);
const ym =
-arcRadius * Math.sin((midAngle * Math.PI) / 180);

return svg`
<path class="level" stroke="${level.stroke}" style="stroke-linecap: butt"
d="M ${x1} ${y1} A ${arcRadius} ${arcRadius} 0 ${largeArc} 1 ${xm} ${ym}" />
<path class="level" stroke="${level.stroke}" style="stroke-linecap: butt"
d="M ${xm} ${ym} A ${arcRadius} ${arcRadius} 0 0 1 ${x2} ${y2}" />
`;
}

return svg`
<path
class="level"
stroke="${level.stroke}"
style="stroke-linecap: ${linecap}"
d="M ${x1} ${y1} A ${arcRadius} ${arcRadius} 0 ${largeArc} 1 ${x2} ${y2}"
></path>
`;
});
})()
: ""
}

${
this.needle
? svg`
<line
class="needle"
x1="-35.0"
y1="0"
x2="-45.0"
y2="0"
style=${styleMap({ transform: `rotate(${this._angle}deg)` })}
/>
<path
class="needle"
d="M -36,-2 L -44,-1 A 1,1,0,0,0,-44,1 L -36,2 A 2,2,0,0,0,-36,-2 Z"

style=${styleMap({ transform: `rotate(${this._angle}deg)` })}
>
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`
: svg`
<path
Expand All @@ -179,7 +186,8 @@ export class HaGauge extends LitElement {
/>
`
}

</svg>
<svg class="text">
<text
class="value-text"
x="0"
Expand All @@ -204,6 +212,18 @@ export class HaGauge extends LitElement {
`;
}

private _rescaleSvg() {
// Set the viewbox of the SVG containing the value to perfectly
// fit the text
// That way it will auto-scale correctly
const svgRoot = this.shadowRoot!.querySelector(".text")!;
const box = svgRoot.querySelector("text")!.getBBox()!;
svgRoot.setAttribute(
"viewBox",
`${box.x} ${box!.y} ${box.width} ${box.height}`
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);
}

private _getSegmentLabel() {
if (this.levels) {
[...this.levels].sort((a, b) => a.level - b.level);
Expand All @@ -224,32 +244,43 @@ export class HaGauge extends LitElement {
.levels-base {
fill: none;
stroke: var(--primary-background-color);
stroke-width: 8;
stroke-linecap: round;
stroke-width: 6;
stroke-linecap: butt;
}

.level {
fill: none;
stroke-width: 8;
stroke-width: 6;
stroke-linecap: butt;
}

.value {
fill: none;
stroke-width: 8;
stroke-width: 6;
stroke: var(--gauge-color);
stroke-linecap: round;
stroke-linecap: butt;
transition: stroke-dashoffset 1s ease 0s;
}

.needle {
stroke: var(--primary-text-color);
stroke-width: 2;
fill: var(--primary-text-color);
stroke: var(--card-background-color);

@wendevlin wendevlin Mar 30, 2026

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what about a transparency for this stroke? Just an idea not sure if it looks nice.

@silamon silamon Mar 30, 2026

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I don't think that's going to be a good idea. The full white (or black depending on theme) behind it makes the contrast better to see where the needle exactly is. We've already received a lot of feedback that this is important for some users.

@Mariusthvdb Mariusthvdb Mar 30, 2026 •
edited
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would it be possible to give needle it its own variable? so we can theme independently from text-color/background-color? might seem niche, but given the many different uses for a gauge, it would be a welcome option to be able to differentiate

color: var(--primary-text-color);
stroke-width: 1;
stroke-linecap: round;
transform-origin: 0 0;
transition: all 1s ease 0s;
}

.text {
position: absolute;
max-height: 40%;
max-width: 55%;
left: 50%;
bottom: 10%;
transform: translate(-50%, 0%);
}

.value-text {
font-size: var(--ha-font-size-l);
fill: var(--primary-text-color);
Expand Down
4 changes: 2 additions & 2 deletions src/panels/lovelace/cards/hui-gauge-card.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -303,9 +303,8 @@ class HuiGaugeCard extends LitElement implements LovelaceCard {

.title {
width: 100%;
font-size: var(--ha-font-size-l);
font-size: var(--ha-font-size-m);
line-height: var(--ha-line-height-expanded);
padding: 0px 0px var(--ha-space-2) 0px;
margin: 0;
text-align: center;
box-sizing: border-box;
Expand All @@ -318,6 +317,7 @@ class HuiGaugeCard extends LitElement implements LovelaceCard {

ha-gauge {
width: 100%;
max-width: 250px;
}
`;
}
Expand Down
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