------------------------------------------------------------------------------
| 402 | |
| 403 | //------------------------------------------------------------------------------ |
| 404 | bool vtkFunctionParser::Evaluate() |
| 405 | { |
| 406 | int numBytesProcessed; |
| 407 | int numImmediatesProcessed = 0; |
| 408 | int stackPosition = -1; |
| 409 | double magnitude; |
| 410 | double temp[3]; |
| 411 | |
| 412 | this->StackPointer = -1; |
| 413 | |
| 414 | if (this->FunctionMTime.GetMTime() > this->ParseMTime.GetMTime()) |
| 415 | { |
| 416 | if (this->Parse() == 0) |
| 417 | { |
| 418 | return false; |
| 419 | } |
| 420 | } |
| 421 | |
| 422 | for (numBytesProcessed = 0; numBytesProcessed < this->ByteCodeSize; numBytesProcessed++) |
| 423 | { |
| 424 | switch (this->ByteCode[numBytesProcessed]) |
| 425 | { |
| 426 | case VTK_PARSER_IMMEDIATE: |
| 427 | this->Stack[++stackPosition] = this->Immediates[numImmediatesProcessed++]; |
| 428 | break; |
| 429 | case VTK_PARSER_UNARY_MINUS: |
| 430 | this->Stack[stackPosition] = -(this->Stack[stackPosition]); |
| 431 | break; |
| 432 | case VTK_PARSER_UNARY_PLUS: |
| 433 | break; |
| 434 | case VTK_PARSER_ADD: |
| 435 | this->Stack[stackPosition - 1] += this->Stack[stackPosition]; |
| 436 | stackPosition--; |
| 437 | break; |
| 438 | case VTK_PARSER_SUBTRACT: |
| 439 | this->Stack[stackPosition - 1] -= this->Stack[stackPosition]; |
| 440 | stackPosition--; |
| 441 | break; |
| 442 | case VTK_PARSER_MULTIPLY: |
| 443 | this->Stack[stackPosition - 1] *= this->Stack[stackPosition]; |
| 444 | stackPosition--; |
| 445 | break; |
| 446 | case VTK_PARSER_DIVIDE: |
| 447 | if (this->Stack[stackPosition] == 0) |
| 448 | { |
| 449 | if (this->ReplaceInvalidValues) |
| 450 | { |
| 451 | this->Stack[stackPosition - 1] = this->ReplacementValue; |
| 452 | stackPosition--; |
| 453 | } |
| 454 | else |
| 455 | { |
| 456 | vtkErrorMacro("Trying to divide by zero"); |
| 457 | return false; |
| 458 | } |
| 459 | } |
| 460 | else |
| 461 | { |