dotColor returns a color for the given score (between -1.0 and 1.0), with -1.0 colored green, 0.0 colored grey, and 1.0 colored red. If isBackground is true, then a light (low-saturation) color is returned (suitable for use as a background color); otherwise, a darker color is returned (suitable for
(score float64, isBackground bool)
| 328 | // otherwise, a darker color is returned (suitable for use as a |
| 329 | // foreground color). |
| 330 | func dotColor(score float64, isBackground bool) string { |
| 331 | // A float between 0.0 and 1.0, indicating the extent to which |
| 332 | // colors should be shifted away from grey (to make positive and |
| 333 | // negative values easier to distinguish, and to make more use of |
| 334 | // the color range.) |
| 335 | const shift = 0.7 |
| 336 | |
| 337 | // Saturation and value (in hsv colorspace) for background colors. |
| 338 | const bgSaturation = 0.1 |
| 339 | const bgValue = 0.93 |
| 340 | |
| 341 | // Saturation and value (in hsv colorspace) for foreground colors. |
| 342 | const fgSaturation = 1.0 |
| 343 | const fgValue = 0.7 |
| 344 | |
| 345 | // Choose saturation and value based on isBackground. |
| 346 | var saturation float64 |
| 347 | var value float64 |
| 348 | if isBackground { |
| 349 | saturation = bgSaturation |
| 350 | value = bgValue |
| 351 | } else { |
| 352 | saturation = fgSaturation |
| 353 | value = fgValue |
| 354 | } |
| 355 | |
| 356 | // Limit the score values to the range [-1.0, 1.0]. |
| 357 | score = math.Max(-1.0, math.Min(1.0, score)) |
| 358 | |
| 359 | // Reduce saturation near score=0 (so it is colored grey, rather than yellow). |
| 360 | if math.Abs(score) < 0.2 { |
| 361 | saturation *= math.Abs(score) / 0.2 |
| 362 | } |
| 363 | |
| 364 | // Apply 'shift' to move scores away from 0.0 (grey). |
| 365 | if score > 0.0 { |
| 366 | score = math.Pow(score, (1.0 - shift)) |
| 367 | } |
| 368 | if score < 0.0 { |
| 369 | score = -math.Pow(-score, (1.0 - shift)) |
| 370 | } |
| 371 | |
| 372 | var r, g, b float64 // red, green, blue |
| 373 | if score < 0.0 { |
| 374 | g = value |
| 375 | r = value * (1 + saturation*score) |
| 376 | } else { |
| 377 | r = value |
| 378 | g = value * (1 - saturation*score) |
| 379 | } |
| 380 | b = value * (1 - saturation) |
| 381 | return fmt.Sprintf("#%02x%02x%02x", uint8(r*255.0), uint8(g*255.0), uint8(b*255.0)) |
| 382 | } |
| 383 | |
| 384 | func multilinePrintableName(info *NodeInfo) string { |
| 385 | infoCopy := *info |