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// This code was created based on vtkLookupTable
// http://www.vtk.org/doc/release/5.0/html/a01697.html
// https://github.com/Kitware/VTK/blob/master/Common/Core/vtkLookupTable.cxx
const BELOW_RANGE_COLOR_INDEX = 0;
const ABOVE_RANGE_COLOR_INDEX = 1;
const NAN_COLOR_INDEX = 2;
/**
* Converts an HSV (Hue, Saturation, Value) color to RGB (Red, Green, Blue) color value
* @param {Number} hue A number representing the hue color value
* @param {any} sat A number representing the saturation color value
* @param {any} val A number representing the value color value
* @returns {Numberp[]} An RGB color array
*/
function HSVToRGB(hue, sat, val) {
if (hue > 1) {
throw new Error('HSVToRGB expects hue < 1');
}
const rgb = [];
if (sat === 0) {
rgb[0] = val;
rgb[1] = val;
rgb[2] = val;
return rgb;
}
const hueCase = Math.floor(hue * 6);
const frac = 6 * hue - hueCase;
const lx = val * (1 - sat);
const ly = val * (1 - sat * frac);
const lz = val * (1 - sat * (1 - frac));
switch (hueCase) {
/* 0<hue<1/6 */
case 0:
case 6:
rgb[0] = val;
rgb[1] = lz;
rgb[2] = lx;
break;
/* 1/6<hue<2/6 */
case 1:
rgb[0] = ly;
rgb[1] = val;
rgb[2] = lx;
break;
/* 2/6<hue<3/6 */
case 2:
rgb[0] = lx;
rgb[1] = val;
rgb[2] = lz;
break;
/* 3/6<hue/4/6 */
case 3:
rgb[0] = lx;
rgb[1] = ly;
rgb[2] = val;
break;
/* 4/6<hue<5/6 */
case 4:
rgb[0] = lz;
rgb[1] = lx;
rgb[2] = val;
break;
/* 5/6<hue<1 */
case 5:
rgb[0] = val;
rgb[1] = lx;
rgb[2] = ly;
break;
}
return rgb;
}
/**
* Maps a value to an index in the table
* @param {Number} v A double value which table index will be returned.
* @param {any} p An object that contains the Table "Range", the table "MaxIndex",
* A "Shift" from first value in the table and the table "Scale" value
* @returns {Number} The mapped index in the table
* @memberof Colors
*/
function linearIndexLookupMain(v, p) {
let dIndex;
// NOTE: Added Math.floor since values were not integers? Check VTK source
if (v < p.Range[0]) {
dIndex = p.MaxIndex + BELOW_RANGE_COLOR_INDEX + 1.5;
} else if (v > p.Range[1]) {
dIndex = p.MaxIndex + ABOVE_RANGE_COLOR_INDEX + 1.5;
} else {
dIndex = (v + p.Shift) * p.Scale;
}
return Math.floor(dIndex);
}
/**
* Maps scalar values into colors via a lookup table
* LookupTable is an object that is used by mapper objects to map scalar values into rgba (red-green-blue-alpha transparency) color specification,
* or rgba into scalar values. The color table can be created by direct insertion of color values, or by specifying hue, saturation, value, and alpha range and generating a table
*/
class LookupTable implements CPUFallbackLookupTable {
NumberOfColors: number;
Ramp: string;
TableRange: Point2;
HueRange: Point2;
SaturationRange: Point2;
ValueRange: Point2;
AlphaRange: Point2;
NaNColor: Point4;
BelowRangeColor: Point4;
UseBelowRangeColor: boolean;
AboveRangeColor: Point4;
UseAboveRangeColor: boolean;
InputRange: Point2;
Table: Point4[];
/**
* Creates a default linear LookupTable object with 256 colors.
*/
constructor() {
this.NumberOfColors = 256;
this.Ramp = 'linear';
this.TableRange = [0, 255];
this.HueRange = [0, 0.66667];
this.SaturationRange = [1, 1];
this.ValueRange = [1, 1];
this.AlphaRange = [1, 1];
this.NaNColor = [128, 0, 0, 255];
this.BelowRangeColor = [0, 0, 0, 255];
this.UseBelowRangeColor = true;
this.AboveRangeColor = [255, 255, 255, 255];
this.UseAboveRangeColor = true;
this.InputRange = [0, 255];
this.Table = [];
}
/**
* Specify the number of values (i.e., colors) in the lookup table.
* @param {Number} number The number of colors in he LookupTable
* @returns {void}
* @memberof Colors
*/
public setNumberOfTableValues(number) {
this.NumberOfColors = number;
}
/**
* Set the shape of the table ramp to either 'linear', 'scurve' or 'sqrt'
* @param {String} ramp A string value representing the shape of the table. Allowed values are 'linear', 'scurve' or 'sqrt'
* @returns {void}
* @memberof Colors
*/
public setRamp(ramp) {
this.Ramp = ramp;
}
/**
* Sets the minimum/maximum scalar values for scalar mapping.
* Scalar values less than minimum range value are clamped to minimum range value.
* Scalar values greater than maximum range value are clamped to maximum range value.
* @param {Number} start A double representing the minimum scaler value of the LookupTable
* @param {any} end A double representing the maximum scaler value of the LookupTable
* @returns {void}
* @memberof Colors
*/
public setTableRange(start, end) {
this.TableRange[0] = start;
this.TableRange[1] = end;
}
/**
* Set the range in hue (using automatic generation). Hue ranges between [0,1].
* @param {Number} start A double representing the minimum hue value in a range. Min. is 0
* @param {Number} end A double representing the maximum hue value in a range. Max. is 1
* @returns {void}
* @memberof Colors
*/
public setHueRange(start, end) {
this.HueRange[0] = start;
this.HueRange[1] = end;
}
/**
* Set the range in saturation (using automatic generation). Saturation ranges between [0,1].
* @param {Number} start A double representing the minimum Saturation value in a range. Min. is 0
* @param {Number} end A double representing the maximum Saturation value in a range. Max. is 1
* @returns {void}
* @memberof Colors
*/
public setSaturationRange(start, end) {
this.SaturationRange[0] = start;
this.SaturationRange[1] = end;
}
/**
* Set the range in value (using automatic generation). Value ranges between [0,1].
* @param {Numeber } start A double representing the minimum value in a range. Min. is 0
* @param {Numeber} end A double representing the maximum value in a range. Max. is 1
* @returns {void}
* @memberof Colors
*/
public setValueRange(start, end) {
// Set the range in value (using automatic generation). Value ranges between [0,1].
this.ValueRange[0] = start;
this.ValueRange[1] = end;
}
/**
* (Not Used) Sets the range of scalars which will be mapped.
* @param {Number} start the minimum scalar value in the range
* @param {Number} end the maximum scalar value in the range
* @returns {void}
* @memberof Colors
*/
public setRange(start, end) {
this.InputRange[0] = start;
this.InputRange[1] = end;
}
/**
* Set the range in alpha (using automatic generation). Alpha ranges from [0,1].
* @param {Number} start A double representing the minimum alpha value
* @param {Number} end A double representing the maximum alpha value
* @returns {void}
* @memberof Colors
*/
public setAlphaRange(start, end) {
// Set the range in alpha (using automatic generation). Alpha ranges from [0,1].
this.AlphaRange[0] = start;
this.AlphaRange[1] = end;
}
/**
* Map one value through the lookup table and return the color as an
* RGBA array of doubles between 0 and 1.
* @param {Number} scalar A double scalar value which will be mapped to a color in the LookupTable
* @returns {Number[]} An RGBA array of doubles between 0 and 1
* @memberof Colors
*/
public getColor(scalar) {
return this.mapValue(scalar);
}
/**
* Generate lookup table from hue, saturation, value, alpha min/max values. Table is built from linear ramp of each value.
* @param {Boolean} force true to force the build of the LookupTable. Otherwie, false. This is useful if a lookup table has been defined manually
* (using SetTableValue) and then an application decides to rebuild the lookup table using the implicit process.
* @returns {void}
* @memberof Colors
*/
public build(force) {
if (this.Table.length > 1 && !force) {
return;
}
// Clear the table
this.Table = [];
const maxIndex = this.NumberOfColors - 1;
let hinc, sinc, vinc, ainc;
if (maxIndex) {
hinc = (this.HueRange[1] - this.HueRange[0]) / maxIndex;
sinc = (this.SaturationRange[1] - this.SaturationRange[0]) / maxIndex;
vinc = (this.ValueRange[1] - this.ValueRange[0]) / maxIndex;
ainc = (this.AlphaRange[1] - this.AlphaRange[0]) / maxIndex;
} else {
hinc = sinc = vinc = ainc = 0.0;
}
for (let i = 0; i <= maxIndex; i++) {
const hue = this.HueRange[0] + i * hinc;
const sat = this.SaturationRange[0] + i * sinc;
const val = this.ValueRange[0] + i * vinc;
const alpha = this.AlphaRange[0] + i * ainc;
const rgb = HSVToRGB(hue, sat, val);
const c_rgba: Point4 = [0, 0, 0, 0];
switch (this.Ramp) {
case 'scurve':
c_rgba[0] = Math.floor(
127.5 * (1.0 + Math.cos((1.0 - rgb[0]) * Math.PI))
);
c_rgba[1] = Math.floor(
127.5 * (1.0 + Math.cos((1.0 - rgb[1]) * Math.PI))
);
c_rgba[2] = Math.floor(
127.5 * (1.0 + Math.cos((1.0 - rgb[2]) * Math.PI))
);
c_rgba[3] = Math.floor(alpha * 255);
break;
case 'linear':
c_rgba[0] = Math.floor(rgb[0] * 255 + 0.5);
c_rgba[1] = Math.floor(rgb[1] * 255 + 0.5);
c_rgba[2] = Math.floor(rgb[2] * 255 + 0.5);
c_rgba[3] = Math.floor(alpha * 255 + 0.5);
break;
case 'sqrt':
c_rgba[0] = Math.floor(Math.sqrt(rgb[0]) * 255 + 0.5);
c_rgba[1] = Math.floor(Math.sqrt(rgb[1]) * 255 + 0.5);
c_rgba[2] = Math.floor(Math.sqrt(rgb[2]) * 255 + 0.5);
c_rgba[3] = Math.floor(Math.sqrt(alpha) * 255 + 0.5);
break;
default:
throw new Error(`Invalid Ramp value (${this.Ramp})`);
}
this.Table.push(c_rgba);
}
this.buildSpecialColors();
}
/**
* Ensures the out-of-range colors (Below range and Above range) are set correctly.
* @returns {void}
* @memberof Colors
*/
private buildSpecialColors() {
const numberOfColors = this.NumberOfColors;
const belowRangeColorIndex = numberOfColors + BELOW_RANGE_COLOR_INDEX;
const aboveRangeColorIndex = numberOfColors + ABOVE_RANGE_COLOR_INDEX;
const nanColorIndex = numberOfColors + NAN_COLOR_INDEX;
// Below range color
if (this.UseBelowRangeColor || numberOfColors === 0) {
this.Table[belowRangeColorIndex] = this.BelowRangeColor;
} else {
// Duplicate the first color in the table.
this.Table[belowRangeColorIndex] = this.Table[0];
}
// Above range color
if (this.UseAboveRangeColor || numberOfColors === 0) {
this.Table[aboveRangeColorIndex] = this.AboveRangeColor;
} else {
// Duplicate the last color in the table.
this.Table[aboveRangeColorIndex] = this.Table[numberOfColors - 1];
}
// Always use NanColor
this.Table[nanColorIndex] = this.NaNColor;
}
/**
* Similar to GetColor - Map one value through the lookup table and return the color as an
* RGBA array of doubles between 0 and 1.
* @param {Numeber} v A double scalar value which will be mapped to a color in the LookupTable
* @returns {Number[]} An RGBA array of doubles between 0 and 1
* @memberof Colors
*/
private mapValue(v) {
const index = this.getIndex(v);
if (index < 0) {
return this.NaNColor;
} else if (index === 0) {
if (this.UseBelowRangeColor && v < this.TableRange[0]) {
return this.BelowRangeColor;
}
} else if (index === this.NumberOfColors - 1) {
if (this.UseAboveRangeColor && v > this.TableRange[1]) {
return this.AboveRangeColor;
}
}
return this.Table[index];
}
/**
* Return the table index associated with a particular value.
* @param {Number} v A double value which table index will be returned.
* @returns {Number} The index in the LookupTable
* @memberof Colors
*/
private getIndex(v) {
const p = {
Range: [],
MaxIndex: this.NumberOfColors - 1,
Shift: -this.TableRange[0],
Scale: 1,
};
if (this.TableRange[1] <= this.TableRange[0]) {
p.Scale = Number.MAX_VALUE;
} else {
p.Scale = p.MaxIndex / (this.TableRange[1] - this.TableRange[0]);
}
p.Range[0] = this.TableRange[0];
p.Range[1] = this.TableRange[1];
// First, check whether we have a number...
if (isNaN(v)) {
// For backwards compatibility
return -1;
}
// Map to an index:
let index = linearIndexLookupMain(v, p);
// For backwards compatibility, if the index indicates an
// Out-of-range value, truncate to index range for in-range colors.
if (index === this.NumberOfColors + BELOW_RANGE_COLOR_INDEX) {
index = 0;
} else if (index === this.NumberOfColors + ABOVE_RANGE_COLOR_INDEX) {
index = this.NumberOfColors - 1;
}
return index;
}
/**
* Directly load color into lookup table. Use [0,1] double values for color component specification.
* Make sure that you've either used the Build() method or used SetNumberOfTableValues() prior to using this method.
* @param {Number} index The index in the LookupTable of where to insert the color value
* @param {Number[]} rgba An array of [0,1] double values for an RGBA color component
* @returns {void}
* @memberof Colors
*/
public setTableValue(index, rgba) {
// Check if it index, red, green, blue and alpha were passed as parameter
if (arguments.length === 5) {
rgba = Array.prototype.slice.call(arguments, 1);
}
// Check the index to make sure it is valid
if (index < 0) {
throw new Error(
`Can't set the table value for negative index (${index})`
);
}
if (index >= this.NumberOfColors) {
new Error(
`Index ${index} is greater than the number of colors ${this.NumberOfColors}`
);
}
this.Table[index] = rgba;
if (index === 0 || index === this.NumberOfColors - 1) {
// This is needed due to the way the special colors are stored in
// The internal table. If Above/BelowRangeColors are not used and
// The min/max colors are changed in the table with this member
// Function, then the colors used for values outside the range may
// Be incorrect. Calling this here ensures the out-of-range colors
// Are set correctly.
this.buildSpecialColors();
}
}
}
export default LookupTable;
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