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Add disableCircularFalloff option for multi heatmaps rendering #35

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8b39793
Add option to remove the circular falloff and fix the blending
toandiep Sep 18, 2025
d1e4092
Update dist for disableCircularFalloff feature
toandiep Sep 18, 2025
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7 changes: 7 additions & 0 deletions dist/types/heatmap.d.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,7 @@ export declare class HeatmapRenderer {
intensity: number;
translate: [number, number];
opacity: number;
disableCircularFalloff: boolean;
hearmapExData: HearmapExData | object;
gradient: MappedGradient | null;
_imageTexture: WebGLTexture | null;
Expand Down Expand Up @@ -91,6 +92,12 @@ export declare class HeatmapRenderer {
*/
setOpacity(opacity: number): HeatmapRenderer;
/**
* Set whether to disable circular falloff
* @param disableCircularFalloff - Boolean to disable circular falloff effect.
* @returns instance
*/
setDisableCircularFalloff(disableCircularFalloff: boolean): HeatmapRenderer;
/**
* Set the background image
* @param config - Accepts Object with { url, height, width, x, and y} properties
* @returns instance
Expand Down
1 change: 1 addition & 0 deletions dist/types/types.d.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -45,6 +45,7 @@ export type HeatmapConfig = {
opacity?: number;
gradient: GradientElement[];
backgroundImage?: BackgroundImageConfig;
disableCircularFalloff?: boolean;
};
export type HearmapExData = {
posVec: Float32Array;
Expand Down
31 changes: 29 additions & 2 deletions dist/visualHeatmap.esm.js
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Original file line number Diff line number Diff line change
Expand Up @@ -61,6 +61,7 @@ const GradShader = {
uniform float u_max;
uniform float u_min;
uniform float u_intensity;
uniform bool u_disableCircularFalloff;
in float v_i;
out vec4 fragColor;

Expand All @@ -71,7 +72,15 @@ const GradShader = {
float deno = max(u_max - u_min, 1e-6); // Prevent division by zero

if(r <= 1.0) {
float alpha = ((v_i - u_min) / deno) * u_intensity * (1.0 - sqrt(r));
float alpha;
if(u_disableCircularFalloff) {
// No circular falloff - uniform intensity within the point
alpha = ((v_i - u_min) / deno) * u_intensity;
} else {
// Apply circular falloff for smoother gradients
alpha = ((v_i - u_min) / deno) * u_intensity * (1.0 - sqrt(r));
}

alpha = clamp(alpha, 0.0, 1.0); // Clamp alpha to valid range
fragColor = vec4(0, 0, 0, alpha);
} else {
Expand Down Expand Up @@ -295,6 +304,7 @@ const createGradiantShader = function (ctx, shader) {
u_zoom: ctx.getUniformLocation(program, "u_zoom"),
u_angle: ctx.getUniformLocation(program, "u_angle"),
u_density: ctx.getUniformLocation(program, "u_density"),
u_disableCircularFalloff: ctx.getUniformLocation(program, "u_disableCircularFalloff"),
},
};
};
Expand Down Expand Up @@ -458,7 +468,7 @@ function renderExec() {
function renderHeatGrad(ctx, exData) {
var _a, _b, _c, _d;
ctx.useProgram(this._gradShadOP.program);
const { u_resolution, u_translate, u_zoom, u_angle, u_density, u_max, u_min, u_size, u_intensity } = this._gradShadOP.uniform;
const { u_resolution, u_translate, u_zoom, u_angle, u_density, u_max, u_min, u_size, u_intensity, u_disableCircularFalloff } = this._gradShadOP.uniform;
this.min =
this.configMin !== null ? this.configMin : (_b = (_a = exData === null || exData === void 0 ? void 0 : exData.minMax) === null || _a === void 0 ? void 0 : _a.min) !== null && _b !== void 0 ? _b : 0;
this.max =
Expand All @@ -474,12 +484,16 @@ function renderHeatGrad(ctx, exData) {
ctx.uniform1f(u_min, this.min);
ctx.uniform1f(u_size, this.size);
ctx.uniform1f(u_intensity, this.intensity);
ctx.uniform1i(u_disableCircularFalloff, this.disableCircularFalloff ? 1 : 0);
this._gradShadOP.attr.forEach(function (d) {
ctx.bindBuffer(d.bufferType, d.buffer);
ctx.bufferData(d.bufferType, d.data, d.drawType);
ctx.enableVertexAttribArray(d.attribute);
ctx.vertexAttribPointer(d.attribute, d.size, d.valueType, true, 0, 0);
});
if (this.disableCircularFalloff) {
ctx.blendEquation(ctx.MAX);
}
ctx.drawArrays(ctx.POINTS, 0, (exData.posVec || []).length / 2);
}
function renderImage(ctx, imageConfig) {
Expand Down Expand Up @@ -559,6 +573,7 @@ class HeatmapRenderer {
this.intensity = 0;
this.translate = [0, 0];
this.opacity = 0;
this.disableCircularFalloff = false;
this.hearmapExData = {};
this.gradient = null;
this._imageTexture = null;
Expand Down Expand Up @@ -806,6 +821,18 @@ class HeatmapRenderer {
return this;
}
/**
* Set whether to disable circular falloff
* @param disableCircularFalloff - Boolean to disable circular falloff effect.
* @returns instance
*/
setDisableCircularFalloff(disableCircularFalloff) {
if (typeof disableCircularFalloff !== 'boolean') {
throw new Error('Invalid disableCircularFalloff: Expected Boolean');
}
this.disableCircularFalloff = disableCircularFalloff;
return this;
}
/**
* Set the background image
* @param config - Accepts Object with { url, height, width, x, and y} properties
* @returns instance
Expand Down
2 changes: 1 addition & 1 deletion dist/visualHeatmap.esm.min.js
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31 changes: 29 additions & 2 deletions dist/visualHeatmap.js
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Original file line number Diff line number Diff line change
Expand Up @@ -67,6 +67,7 @@ vec2 rotation(vec2 v, float a, float aspect) {
uniform float u_max;
uniform float u_min;
uniform float u_intensity;
uniform bool u_disableCircularFalloff;
in float v_i;
out vec4 fragColor;

Expand All @@ -77,7 +78,15 @@ vec2 rotation(vec2 v, float a, float aspect) {
float deno = max(u_max - u_min, 1e-6); // Prevent division by zero

if(r <= 1.0) {
float alpha = ((v_i - u_min) / deno) * u_intensity * (1.0 - sqrt(r));
float alpha;
if(u_disableCircularFalloff) {
// No circular falloff - uniform intensity within the point
alpha = ((v_i - u_min) / deno) * u_intensity;
} else {
// Apply circular falloff for smoother gradients
alpha = ((v_i - u_min) / deno) * u_intensity * (1.0 - sqrt(r));
}

alpha = clamp(alpha, 0.0, 1.0); // Clamp alpha to valid range
fragColor = vec4(0, 0, 0, alpha);
} else {
Expand Down Expand Up @@ -301,6 +310,7 @@ vec2 rotation(vec2 v, float a, float aspect) {
u_zoom: ctx.getUniformLocation(program, "u_zoom"),
u_angle: ctx.getUniformLocation(program, "u_angle"),
u_density: ctx.getUniformLocation(program, "u_density"),
u_disableCircularFalloff: ctx.getUniformLocation(program, "u_disableCircularFalloff"),
},
};
};
Expand Down Expand Up @@ -464,7 +474,7 @@ vec2 rotation(vec2 v, float a, float aspect) {
function renderHeatGrad(ctx, exData) {
var _a, _b, _c, _d;
ctx.useProgram(this._gradShadOP.program);
const { u_resolution, u_translate, u_zoom, u_angle, u_density, u_max, u_min, u_size, u_intensity } = this._gradShadOP.uniform;
const { u_resolution, u_translate, u_zoom, u_angle, u_density, u_max, u_min, u_size, u_intensity, u_disableCircularFalloff } = this._gradShadOP.uniform;
this.min =
this.configMin !== null ? this.configMin : (_b = (_a = exData === null || exData === void 0 ? void 0 : exData.minMax) === null || _a === void 0 ? void 0 : _a.min) !== null && _b !== void 0 ? _b : 0;
this.max =
Expand All @@ -480,12 +490,16 @@ vec2 rotation(vec2 v, float a, float aspect) {
ctx.uniform1f(u_min, this.min);
ctx.uniform1f(u_size, this.size);
ctx.uniform1f(u_intensity, this.intensity);
ctx.uniform1i(u_disableCircularFalloff, this.disableCircularFalloff ? 1 : 0);
this._gradShadOP.attr.forEach(function (d) {
ctx.bindBuffer(d.bufferType, d.buffer);
ctx.bufferData(d.bufferType, d.data, d.drawType);
ctx.enableVertexAttribArray(d.attribute);
ctx.vertexAttribPointer(d.attribute, d.size, d.valueType, true, 0, 0);
});
if (this.disableCircularFalloff) {
ctx.blendEquation(ctx.MAX);
}
ctx.drawArrays(ctx.POINTS, 0, (exData.posVec || []).length / 2);
}
function renderImage(ctx, imageConfig) {
Expand Down Expand Up @@ -565,6 +579,7 @@ vec2 rotation(vec2 v, float a, float aspect) {
this.intensity = 0;
this.translate = [0, 0];
this.opacity = 0;
this.disableCircularFalloff = false;
this.hearmapExData = {};
this.gradient = null;
this._imageTexture = null;
Expand Down Expand Up @@ -812,6 +827,18 @@ vec2 rotation(vec2 v, float a, float aspect) {
return this;
}
/**
* Set whether to disable circular falloff
* @param disableCircularFalloff - Boolean to disable circular falloff effect.
* @returns instance
*/
setDisableCircularFalloff(disableCircularFalloff) {
if (typeof disableCircularFalloff !== 'boolean') {
throw new Error('Invalid disableCircularFalloff: Expected Boolean');
}
this.disableCircularFalloff = disableCircularFalloff;
return this;
}
/**
* Set the background image
* @param config - Accepts Object with { url, height, width, x, and y} properties
* @returns instance
Expand Down
2 changes: 1 addition & 1 deletion dist/visualHeatmap.min.js
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Large diffs are not rendered by default.

21 changes: 20 additions & 1 deletion src/heatmap.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -166,7 +166,7 @@ function renderHeatGrad(
) {
ctx.useProgram(this._gradShadOP.program);

const {u_resolution, u_translate, u_zoom, u_angle, u_density, u_max, u_min, u_size, u_intensity } = this._gradShadOP.uniform;
const {u_resolution, u_translate, u_zoom, u_angle, u_density, u_max, u_min, u_size, u_intensity, u_disableCircularFalloff } = this._gradShadOP.uniform;
this.min =
this.configMin !== null ? this.configMin : exData?.minMax?.min ?? 0;
this.max =
Expand All @@ -189,6 +189,7 @@ function renderHeatGrad(
ctx.uniform1f(u_min, this.min);
ctx.uniform1f(u_size, this.size);
ctx.uniform1f(u_intensity, this.intensity);
ctx.uniform1i(u_disableCircularFalloff, this.disableCircularFalloff ? 1 : 0);

this._gradShadOP.attr.forEach(function (d) {
ctx.bindBuffer(d.bufferType, d.buffer);
Expand All @@ -197,6 +198,10 @@ function renderHeatGrad(
ctx.vertexAttribPointer(d.attribute, d.size, d.valueType, true, 0, 0);
});

if (this.disableCircularFalloff) {
ctx.blendEquation(ctx.MAX);
}

ctx.drawArrays(ctx.POINTS, 0, (exData.posVec || []).length / 2);
}

Expand Down Expand Up @@ -307,6 +312,7 @@ export class HeatmapRenderer {
intensity: number = 0;
translate: [number, number] = [0, 0];
opacity: number = 0;
disableCircularFalloff: boolean = false;
hearmapExData: HearmapExData | object = {};

gradient: MappedGradient | null = null;
Expand Down Expand Up @@ -590,6 +596,19 @@ export class HeatmapRenderer {
return this;
}

/**
* Set whether to disable circular falloff
* @param disableCircularFalloff - Boolean to disable circular falloff effect.
* @returns instance
*/
setDisableCircularFalloff(disableCircularFalloff: boolean): HeatmapRenderer {
if (typeof disableCircularFalloff !== 'boolean') {
throw new Error('Invalid disableCircularFalloff: Expected Boolean');
}
this.disableCircularFalloff = disableCircularFalloff;
return this;
}

/**
* Set the background image
* @param config - Accepts Object with { url, height, width, x, and y} properties
Expand Down
11 changes: 10 additions & 1 deletion src/shaders.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -58,6 +58,7 @@ export const GradShader = {
uniform float u_max;
uniform float u_min;
uniform float u_intensity;
uniform bool u_disableCircularFalloff;
in float v_i;
out vec4 fragColor;

Expand All @@ -68,7 +69,15 @@ export const GradShader = {
float deno = max(u_max - u_min, 1e-6); // Prevent division by zero

if(r <= 1.0) {
float alpha = ((v_i - u_min) / deno) * u_intensity * (1.0 - sqrt(r));
float alpha;
if(u_disableCircularFalloff) {
// No circular falloff - uniform intensity within the point
alpha = ((v_i - u_min) / deno) * u_intensity;
} else {
// Apply circular falloff for smoother gradients
alpha = ((v_i - u_min) / deno) * u_intensity * (1.0 - sqrt(r));
}

alpha = clamp(alpha, 0.0, 1.0); // Clamp alpha to valid range
fragColor = vec4(0, 0, 0, alpha);
} else {
Expand Down
1 change: 1 addition & 0 deletions src/types.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -58,6 +58,7 @@ export type HeatmapConfig = {
opacity?: number;
gradient: GradientElement[];
backgroundImage?: BackgroundImageConfig;
disableCircularFalloff?: boolean;
};

export type HearmapExData = {
Expand Down
1 change: 1 addition & 0 deletions src/utils/shaderUtils.ts
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Expand Up @@ -145,6 +145,7 @@ export const createGradiantShader = function (
u_zoom: ctx.getUniformLocation(program, "u_zoom"),
u_angle: ctx.getUniformLocation(program, "u_angle"),
u_density: ctx.getUniformLocation(program, "u_density"),
u_disableCircularFalloff: ctx.getUniformLocation(program, "u_disableCircularFalloff"),
},
};
};
Expand Down