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graphics.cpp
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graphics.cpp
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/*
** Daedalus (Version 3.5) File: graphics.cpp
** By Walter D. Pullen, [email protected], http://www.astrolog.org/labyrnth.htm
**
** IMPORTANT NOTICE: Daedalus and all Maze generation and general
** graphics routines used in this program are Copyright (C) 1998-2024 by
** Walter D. Pullen. Permission is granted to freely use, modify, and
** distribute these routines provided these credits and notices remain
** unmodified with any altered or distributed versions of the program.
** The user does have all rights to Mazes and other graphic output
** they make in Daedalus, like a novel created in a word processor.
**
** More formally: This program is free software; you can redistribute it
** and/or modify it under the terms of the GNU General Public License as
** published by the Free Software Foundation; either version 2 of the
** License, or (at your option) any later version. This program is
** distributed in the hope that it will be useful and inspiring, but
** WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
** General Public License for more details, a copy of which is in the
** LICENSE.HTM included with Daedalus, and at http://www.gnu.org
**
** This file contains general graphics routines, that operate on a monochrome
** bitmap, unrelated to Mazes.
**
** Converted from Modula2: 3/8/1991.
** Last code change: 10/30/2024.
*/
#include <stdio.h>
#include <math.h>
#include "util.h"
#include "graphics.h"
// Offset table for orthogonal and diagonal directions.
CONST int xoff[DIRS2] = { 0,-1, 0, 1, -1, -1, 1, 1};
CONST int yoff[DIRS2] = {-1, 0, 1, 0, -1, 1, 1, -1};
CONST int xoff2[DIRS2] = { 0,-2, 0, 2, -2, -2, 2, 2};
CONST int yoff2[DIRS2] = {-2, 0, 2, 0, -2, 2, 2, -2};
// Simple truth table for logical operators, given the number of true bits.
CONST int rgfOr[3] = {0, 1, 1};
CONST int rgfAnd[3] = {0, 0, 1};
CONST int rgfXor[3] = {0, 1, 0};
// Dither table giving the order to set points in a 4x4 pixel patch.
CONST int rgnDitherPoint[16] =
{6, 14, 7, 15,
9, 1, 12, 4,
8, 16, 5, 13,
11, 3, 10, 2};
// Bit flags for all combinations of a consecutive group of <= 3 neighbors.
CONST int rggrfNeighbor[25] = {0x00,
0x01, 0x10, 0x02, 0x20, 0x04, 0x40, 0x08, 0x80,
0x11, 0x12, 0x22, 0x24, 0x44, 0x48, 0x88, 0x81,
0x13, 0x32, 0x26, 0x64, 0x4C, 0xC8, 0x89, 0x91};
// Turtle font for height 5 variable width characters.
CONST char *szTurtleCh1[128-32] = {
"BR4", "D2BD2D0BU4BR2", "DBR2UBR2", "BRD4BR2U4BFL4BD2R4BU3BR2",
"NR2D2R2D2LNLU4BR3", "D0BR2DG2DBR2D0BU4BR2", "BFD2LUR2BE2", "NDBR2",
"BRGD2FBU4BR2", "FD2GBU4BR3", "BFDNLNDNRNHNGNFEBUBR2", "BFD2BHR2BE2",
"BD4EBU3BR2", "BD2R2BE2", "BD4D0BU4BR2", "BD4UE2UBR2", // Symbols
"BRGD2FEU2HBR3", "RD4NRLBE4", "R2D2L2D2NR2BE4", "R2D2NL2D2L2BE4",
"D2R2ND2U2BR2", "NR2D2RFGLBE4", "NR2D4R2U2NL2BE2", "R2DG2DBE4",
"D4R2U2NL2U2L2BR4", "ND2R2D2NL2D2L2BE4", // Digits
"BDD0BD2D0BU3BR2", "BFD0BD2GBU4BR3", "BR2G2F2BU4BR2", "BDR2BD2L2BU3BR4",
"F2G2BE4", "R2D2L2BD2D0BE4", "BF2U2L2D4NR2BE4", // Symbols
"NR2D2ND2R2ND2U2BR2", "ND4RFGNLFGLBE4", "ND4R2DBD2DL2BE4", "ND4RFD2GLBE4",
"NR2D2NR2D2NR2BE4", "NR2D2NR2D2BE4", "NR2D4R2U2BE2", "D2ND2R2ND2U2BR2",
"RNRD4NRLBE4", "BD3DR2U4BR2", "D2ND2RFDBU3NGUBR2", "D4NR2BE4",
"ND4RFND3ERND4BR2", "ND4R2ND4BR2", "D4R2U4L2BR4", "D2ND2R2U2L2BR4",
"D4REU3NL2BD4HBE3", "D2ND2RFDBU3NGHLBR4", "NR2D2R2D2L2BE4", "RND4RBR2",
"D4R2U4BR2", "D3FEU3BR2", "D4RENU3FRU4BR2", "DF2DBL2UE2UBR2",
"D2RND2RU2BR2", "R2DG2DNR2BE4", // Upper Case Letters
"NR2D4NR2BE4", "DF2DBU4BR2", "R2D4L2BE4", "BDEFBUBR2",
"BD4NR2BE4", "NFBR3", // Symbols
"", "", "", "", "", "", "", "", "", "", "", "", "",
"", "", "", "", "", "", "", "", "", "", "", "", "", // Lower Case Letters
"BR2LDGFDRBU4BR2", "ND4BR2", "RDFGDLBE4", "BDEDEBR2",
"BRGFEHBR3"}; // Symbols
// Turtle font for 5x9 characters.
CONST char *szTurtleCh2[256-32] = {"",
"BR2D4BD2D0", "BRD2BR2U2", "BD2R4BD2L4BFU4BR2D4", "BR2D6BENL3EHL2HER3",
"RDLNUBR4G4BR4DLUR", "BD2NF4UEFDG2DFRE2", "BR2DG", "BR3G2D2F2", "BRF2D2G2",
"BD2FNGRNU2ND2RNEF", "BD3R2NU2ND2R2", "BD5BR2DG", "BD3R4", "BD6BRRULD",
"BD5E4", // Special Characters
"BDD4NE4FR2EU4HL2G", "BFED6NLR", "BDER2FDG4R4", "BDER2FDGNLFDGL2H",
"D3R3NU3ND3R", "NR4D3R3FDGL2H", "BR3NFL2GD4FR2EUHL3", "R4DG4D",
"BDDFNR2GDFR2EUHEUHL2G", "BD5FR2EU4HL2GDFR3", // Numbers
"BR2BD2D0BD2D0", "BR2BD2D0BD2G", "BR3G3F3", "BD2R4BD2L4", "BRF3G3",
"BDER2FDGLDBD2D0", "BF2DFEU2HL2GD4FR2", // Special Characters
"BD6U4E2F2D2NL4D2", "D6R3EUHNL3EUHL3", "BR3NFL2GD4FR2E", "D6R2E2U2H2L2",
"NR4D3NR3D3R4", "NR4D3NR3D3", "BR3NFL2GD4FR2EU2L2", "D3ND3R4NU3D3",
"BRRNRD6NLR", "BD4DFR2EU5", "D3ND3RNE3F3", "D6R4", "ND6F2NDE2D6",
"ND6F4ND2U4", "BDD4FR2EU4HL2G", "R3FDGL3NU3D3", "BDD4FRENHNFEU3HL2G",
"ND6R3FDGL2NLF3", "BR3NFL2GDFR2FDGL2H", "R2NR2D6", "D5FR2EU5",
"D2FDFNDEUEU2", "D6E2NUF2U6", "DF4DBL4UE4U", "D2FRND3REU2",
"R4DG4DR4", // Upper Case Letters
"BR3L2D6R2", "BDF4", "BRR2D6L2", "BD2E2F2", "BD6R4", "BR2DF", // Symbols
"BF4G2LHU2ER2FD3", "D5NDFR2EU2HL2G", "BF4BUHL2GD2FR2E", "BR4D5NDGL2HU2ER2F",
"BD4R4UHL2GD2FR3", "BD3RNR3ND3U2ERF", "BD8R3EU4HL2GD2FR2E", "D3ND3ER2FD3",
"BR2D0BD2D4", "BR3D0BD2D5GLH", "D4ND2REREBD4HLH", "BR2D6",
"BD2DND3EFNDEFD3", "BD2DND3ER2FD3", "BD3D2FR2EU2HL2G", "BD2DND5ER2FD2GL2H",
"BR4BD8U5HL2GD2FR2E", "BD2DND3ER2F", "BD6R3EHL2HER3", "BR2D2NL2NR2D4",
"BD2D3FRE2NU2D2", "BD2DFDFEUEU", "BD2D3FENUFEU3", "BD2F2NG2NE2F2",
"BD2D3FR2ENU3D2GL3", "BD2R4G4R4", // Lower Case Letters
"BR3GDGFDF", "BR2D2BD2D2", "BRFDFGDG", "BFEFE", "", // Symbols
"BR3NFLGDNRNLD2NRNLDFRE", "BR2FGHE", "BR2BD4DG", "BR4LGD2NRNLD2GL",
"BD6EBFE", "BD6D0BR2D0BR2D0", "BR2DNL2NR2D4", "BR2DNL2NR2D4NL2NR2D",
"BR2NGF", "RDLNUBR4G2L2BD2RDLUBR3RDLU", "BD5FR2EUHL2HUER2NFBU2GH", "BF2FG",
"BRNRGD4FRNR2U3NR2U3R2", "", "R4DG4DR4BU8BLGH", "", // 80-8F
"", "BR3GD", "BR2DG", "BFNDEBFNED", "BD2EUBR2DG", "BD3BRRDLU", "BD3BRR2",
"BD3R4", "BFEFE", "RND2RBRND2FNDED2", "BD6R3EHL2HENR3BU3FE", "BF2GF",
"BD3NED2FRNR2U2R2UHLNLD2", "", "BD6NR4E4L4BU3BRFE",
"D2FRND3REU2BUBHD0BL2D0", // 90-9F
"", "BR2D0BD2D4", "BR2DND6NLRFBL4NED3FR2E", "BD6RNR3U3NLNR2U2ERF",
"BDFEFNEFGNFGHNGHE", "F2NE2DNL2NR2D2NL2NR2D", "BR2D2BD2D2",
"BD6R3EHNL2EHL2GFBU2HER3", "BRD0BR2D0", "BD2ER2FD2GL2HU2BR3LGFR",
"BF4U2NUG2LHU2ER2FBD5L4", "BD3NFEBR3GF", "BD2R4D", "BD3BRR2",
"BD2ER2FD2GL2HU2BRND2R2DLNLF", "BRR2", // A0-AF
"BR2FGHE", "BR2D2NL2NR2D2BG2R4", "BRR2DL2DR2", "BRR2DNLDL2", "BR3G",
"BD3D2ND3FRE2NUD2", "BR4ND6L2ND6LGDFR", "BR2BD3D0", "BR2BD5DL", "BRRD2NLR",
"BDD2FR2EU2HL2G", "BD2FGBR3EH", "RND2BR3BDG4BDBR4UNULU",
"RND2BR3BDG4BDBR4LURUL", "RD2LBURBR3G4BDBR4UNULU",
"BR2D0BD2DLGDFR2E", // B0-BF
"BD6U4E2F2D2NL4D2BU7BLH", "BD6U4E2F2D2NL4D2BU7BL3E",
"BD6U4E2F2D2NL4D2BU7BLHG", "BD6U4E2F2D2NL4D2BU8GHG",
"BD6U4E2F2D2NL4D2BU8BLD0BL2D0", "BD6U4E2F2D2NL4D2BU8BL2D0",
"BD6U2NR2U2E2NR2D3NR2D3R2", "BR3NFL2GD4FR2EBG2DL", "NR4D3NR3D3R4BU7BLH",
"NR4D3NR3D3R4BU7BL3E", "NR4D3NR3D3R4BU7BLHG", "NR4D3NR3D3R4BU8BLD0BL2D0",
"BRRNRD6NLRBU7H", "BRRNRD6NLRBU7BL2E", "BRRNRD6NLRBU7HG",
"BRRNRD6NLRBU8D0BL2D0", // C0-CF
"BD3RNRD3RE2U2H2LD3", "ND6F4ND2U4BU2GHG", "BRGD4FR2EU4HNL2BUH",
"BRGD4FR2EU4HL2BUE", "BRGD4FR2EU4HL2BUEF", "BRGD4FR2EU4HL2BUEFE",
"BRGD4FR2EU4HL2BU2D0BR2D0", "BDF2NE2NG2F2", "BRGD4FR2EU4HNL2BRGDG2DG",
"D5FR2EU5BHBLH", "D5FR2EU5BHBLE", "D5FR2EU5BHHG", "D5FR2EU5BHBUD0BL2D0",
"D2FRND3REU2BHBLE", "D5NDR3EU2HL3", "BD6U5ERFDGF2GL", // D0-DF
"BF4G2LHU2ER2FD3BU6BLH", "BF4G2LHU2ER2FD3BU6BL2E", "BF4G2LHU2ER2FD3BU6BLHG",
"BF4G2LHU2ER2FD3BU7GHG", "BF4G2LHU2ER2FD3BU6BLD0BL2D0",
"BF4G2LHU2ER2FD3BU6BL2D0", "BD2R3FDL3GDR2NR2U4", "BF4BUHL2GD2FR2EBG3RU2",
"BD4R4UHL2GD2FR3BU6BL2H", "BD4R4UHL2GD2FR3BU7BLG", "BD4R4UHL2GD2FR3BU6BLHG",
"BD4R4UHL2GD2FR3BU6BLD0BL2D0", "BEFBD2D4", "BR2NEBD2D4", "BRENFBD3D4",
"BRD0BR2D0BLBD2D4", // E0-EF
"BR3DNLNRD2FDGL2HUER2", "BD2DND3ER2FD3BU7GHG", "BD3D2FR2EU2HL2NGBU3F",
"BD3D2FR2EU2HL2NGBUBEE", "BD3D2FR2EU2HL2NGBU2EF", "BD3D2FR2EU2HL2NGBU2EFE",
"BD3D2FR2EU2HL2NGBU2D0BR2D0", "BD3R4BH2D0BD4D0", "BD3D2FR2EU2HL2GD2BDE4",
"BD2D3FRE2ND2U2BH2H", "BD2D3FRE2ND2U2BH2E", "BD2D3FRE2ND2U2BUBHHG",
"BD2D3FRE2ND2U2BHBUD0BL2D0", "BD8R3EU2NU3GL2HU3BE2E", "D5ND3FR2EU2HL2G",
"BD8R3EU2NU3GL2HU3BEBUD0BR2D0"}; // F0-FF
// Turtle font for 8x13 unicursal characters.
CONST char *szTurtleCh3[128-32] = {
"R7", "R3ULU2RU2LU7R3D7LD2RD2LDR3", "RU8LU4R2D4R3U4R2D4LD8R",
"R2U3RUL3UR2U3L2URU3RD3R3U3RD3RDL2D3R2DL3DRD3R2",
"URDR2U5RD5R2U6L6U6R7D2LUL2D3LU3L2D4R6D7",
"U3RURURURURURU2L6U2R2DR4URD5LDLDLDLDLDLD2R4U2R2DLDR",
"R3U4LULULUR3U3RD3R3DL3D6R3", "R3U8LU2RU2R2D4LD8R3",
"R5ULULU2LU4RU2RURURD2LDLD2LD2RD2RDRD2R",
"RU2RURU2RU2LU2LULU2RDRDRD2RD4LD2LDLDR5",
"R3U5LDL2URUR2UL2ULUR2DRU3RD3RUR2DLDL2DR2DRDL2ULD5R3",
"R3U6L3UR3U3RD3R3DL3D6R3", "R2U3RURD2LD2R4", "R3U6L3UR7DL3D6R3",
"R2U3R2D2LDR4", "U2RU2RU2RU2RU2RU2R2DLD2LD2LD2LD2LD2LDR6", // Symbols
"R2ULULU9RUR5DRD9LDL3DR4", "RURDRU11L2UR3D12RURDR",
"U5RUR5U5L5DLU2R7D7L5DLD4R6", "URDR5U6L4UR4U4L5DLU2R7D12",
"R5U6L5U6RD5R4U5RD5RDLD6R", "URDR5U6L6U6R7DL6D4R6D7",
"U12R7D2LUL5D5R6D5L6DR6", "U3RURURURURURU3L6UR7D5LDLDLDLDLDLD2R6",
"U12R7D5L6DR6D5L6DR6", "U2RD2R5U7L6U5R7D12", // Digits
"R3U2LU2RU4LU2R3D2LD4RD2LD2R3", "RU2RURU5LU2R3D2LD4RD2LDL2DR5",
"R6ULULULULULULURURURURURUR2DLDLDLDLDLDRDRDRDRDRD2",
"R3U4L3UR3U3L3UR7DL3D3R3DL3D4R3",
"U2RURURURURULULULULULUR2DRDRDRDRDRDLDLDLDLDLDLDR6",
"U3RU3RUR3URU2LUL3DLDLU2RUR5DRD4LDL3DLD2RD2L2DR6",
"RULU10RUR5DRD5LDL3U3RD2RURU3LUL3DLD8RD2RURDRURDR", // Symbols
"U11RUR5DRD5L6DR6D5", "U12R6DRD3LDL5DR5DRD3LDL5DR6",
"U12R7D3LU2L5D11RURDRURDRU2RD2", "U12R5DRDRD7LDLDL4DR6",
"U12R7DL6D4R5DL5D6RURDRURDRURD", "U12R7DL6D5R5DL5D5R6",
"U12R7D3LU2L5D11RURDRURDRU5LUR2D6", "U12RD6R5U6RD12",
"RURDRU11L2UR5DL2D11RURDR", "U2RD2RURDRURDRU12RD12",
"U12RD6R2URURURU3RD4LDLDLDLDRDRDRDRD", "U12RD12RURDRURDRURD",
"U12R3D11RU11R3D12", "U12R5DRDRD10", "U12R7D11L6DR6",
"U12R6DRD4LDL5D6R6", "U12R7D10LULULULD2RDRDL4DR6",
"U12R6DRD4LDL5DRDRDRDRDRDR", "URDR5U5L6U7R7D2LUL5D5R6D6",
"R3U11L3UR7DL3D11R3", "U12RD12RURDRURDRU12RD12",
"R3U2LULULU8RD7RDRDRURURU7RD8LDLDLD2R3", "U12RD12R2U11RD11R2U12RD12",
"U3RURURU2LULULU3RD2RDRDRURURU2RD3LDLDLD2RDRDRD3",
"R3U5L3U7RD6R5U6RD7L3D5R3",
"U3RURURURURURU3L6UR7D5LDLDLDLDLDLD2R6", // Upper Case Letters
"RU12R5DL4D11RURDRURDR", "R6ULU2LU2LU2LU2LU2LUR2D2RD2RD2RD2RD2RD2",
"RURDRURDRU11L4UR5D12R", "RU10RURURDRDRD10R", "URDRURDRURDRURD",
"R3U8LU4R2D2RD2LD8R3", // Symbols
"", "", "", "", "", "", "", "", "", "", "", "", "",
"", "", "", "", "", "", "", "", "", "", "", "", "", // Lower Case Letters
"R5ULULU2LU2L2UR2U2RU2RUR2DLDLD2LD3RD2RDRD2R", "R3U12RD12R3",
"RU2RURU2RU3LU2LULUR2DRD2RD2R2DL2D2LD2LDLDR5", "U10RURURDRDRURURD12",
"R3U8LULU2RUR3DRD2LDLD8R3"}; // Symbols
// Turtle font for 8x14 characters.
CONST char *szTurtleCh4[256-32] = {"",
"BR3D5BD3D", "BR2D3BR3U3", "BD3R6BD3L6BF2U7BR2D7",
"BR3D9BH2BLFR4EU2HL4HUER4F", "RDLNUBR6G6BR6DLUR", "BD3NF6U2ERFD2G3D2FR2E3",
"BR3DG", "BR4G3D3F3", "BR2F3D3G3", "BD2F2NG2RNU3ND3RNE2F2", "BD4R3NU3ND3R3",
"BR3BD8DG", "BD4R6", "BD9BR2RULD", "BD7E6", // Special Characters
"BD2D5NE5F2R2E2U5NLH2L2G2", "BR3NG2D9NL2R2", "BD2E2R2F2DG6R6",
"BD2E2R2F2G2NLF2DG2L2H2", "D5R4NU5ND4R2", "NR6D4R4F2DG2L2H2",
"BR4NF2L2G2D5F2R2E2UH2L2G2", "R6DG6D2", "BD2F2NR2G2DF2R2E2UH2E2H2L2G2",
"BD7F2R2E2U5H2L2G2DF2R2E2", // Numbers
"BR2BD2DRULBD4DRUL", "BR2BD2DRULBD4RDG", "BR4G4F4", "BD3R6BD3L6", "BRF4G4",
"BD2E2R2F2DG2LD2BD2D0", "BF3RDLNUDFREU3H2L2G2D5F2R3E", // Special Characters
"BD9U6E3F3D3NL6D3", "D9R4E2UH2NL4E2H2L4", "BR4NF2L2G2D5F2R2E2",
"D9R3E3U3H3L3", "NR6D4NR5D5R6", "NR6D5NR5D4", "BR4NF2L2G2D5F2R2E2U2L3",
"D4ND5R6NU4D5", "BRR2NR2D9NL2R2", "BD6DF2R2E2U7", "D4ND5R2NE4F4D", "D9R6",
"ND9F3ND2E3D9", "ND9F2DFDFDF2U9", "BD2D5F2R2E2U5H2L2G2", "ND9R4F2DG2L4",
"BD2D5F2R2ENFNH2EU5H2L2G2", "ND9R4F2DG2L2NL2F4", "BR4NF2L2G2F2R2F2DG2L2H2",
"R3NR3D9", "D7F2R2E2U7", "D3FDFDFNDEUEUEU3", "D9E3NU2F3U9",
"DF6D2BL6U2E6U", "D3F2RND4RE2U3", "R6DG6D2R6", // Upper Case Letters
"BR4L3D9R3", "BDF6", "BRR3D9L3", "BD3E3F3", "BD9R6", "BR3DF", // Symbols
"BF6G3LH2U2E2R3FD5", "D7ND2F2R2E2U2H2L2G2", "BR6BD4HL3G2D2F2R3E",
"BR6D7ND2G2L2H2U2E2R2F2", "BD6R6UH2L2G2D2F2R3E", "BD4R2NR4ND5U3ER2F",
"BD11FR3E2U5H2L2G2D2F2R2E2", "D5ND4E2R2F2D4", "BR3DBD3D5", "BR4DBD3D7GL2H",
"D6ND3REREREBD6HLHLH", "BR3D9", "BD3DND5ERFND2ERFD5", "BD3D2ND4E2R2F2D4",
"BD5D2F2R2E2U2H2L2G2", "BD3D2ND7E2R2F2D2G2L2H2",
"BR6BD12U7NU2H2L2G2D2F2R2E2", "BD3D2ND4E2R2F2", "BD8FR4EUHL4HUER4F",
"BR3D4NL3NR3D5", "BD3D4F2R2E2NU4D2", "BD3DFDFDFEUEUEU", "BD3D5FRENU2FREU5",
"BD3F3NG3NE3F3", "BD3D4F2R2E2NU4D3G2L4", "BD3R6G6R6", // Lower Case Letters
"BR4LGD2GFD2FR", "BR3D3BD3D3", "BRRFD2FGD2GL", "BFERFRE", "", // Symbols
"BR5NFL2G2DNR2NLD2NR2NLD2F2R2E", "BR3FGHE", "BR3BD8DG", "BR5LGD3NR2NL2D4GL",
"BD9BREBFE", "BD9BRD0BR2D0BR2D0", "BR3BDD2NL2NR2D5",
"BR3BDD2NL2NR2D3NL2NR2D2", "BR3NGF", "BRFGHNEBR6GLG2LGBD3EFGHBR4EFGH",
"BU3BR2FEBD3NF2L2G2F2R2F2DG2L2H2", "BR3BD2F2G2", "BR2NRG2D5F2RNR3U5NR2U4R3",
"", "R6DG6D2R6BU12BL2GH", "", // 80-8F
"", "BR4GD", "BR3DG", "BFNDEBR3GD", "BRBD2EUBR3DG", "BD4BR3RDLU", "BD4BRR4",
"BD4R6", "BRBFEFE", "RND2RBR2ND2FNDED2", "BD8FR4EUHL4HUER4FBH4FE",
"BR4BD2G2F2", "BD4NED4FREU4HLBR3NGRFD2L3BD2FRE", "", "BD3R6G6R6BU9BL2GH",
"D3F2RND4RE2U3BH2D0BL2D0", // 90-9F
"", "BR3DBD3D5", "BR3D2ND7NL2R2FBL6NED3FR4E", "BD9RNR5U4NLNR4U3E2R2F",
"DFER2FEUBD3NHD2BD3UHNEGL2HGDBU3NFU2E", "F3NE3D2NL2NR2D2NL2NR2D2",
"BR3D3BD3D3", "BD8FR4EUHNL4EUHL4GDFBU3HUER4F", "BR2D0BR2D0",
"BD3E2R2F2D2G2L2H2U2BR4LGFR", "BRBF4U2NUG2LHU2ER2FBD5L4", "BD4NF2E2BR4G2F2",
"BD4R6D2", "BD4BRR4", "BD2E2R2F2D2G2L2H2U2BR2ND2R2DLNLF", "BRR4", // A0-AF
"BR3FGHE", "BR3D3NL3NR3D3BG3R6", "BRR3FGL2GDR4", "BRR3FGNL3FGL3", "BR4G",
"BD3D4ND5F2RE2NU4DF", "BR6ND9L3ND9LG2D2F2R", "BR3BD4D0", "BR3BD8DL",
"BRR2D4NL2R2", "BR3GD2FR2EU2HL2BLBD6R4", "BD2F2G2BR4E2H2",
"RD3NLRBR4BU2G6BR6ND2NU2L2U2", "RD3NLRBR4BU2G6BR6BD2L2U2R2U2L2",
"R2D2NL2D2L2BR6BU2G6BDBR6UNU2L2U2", "BR3D0BD2D2LG2DF2R2E2", // B0-BF
"BD9U6E3F3D3NL6D3BU10BL2H", "BD9U6E3F3D3NL6D3BU10BL4E",
"BD9U6E3F3D3NL6D3BU10BL2HG", "BD9U6E3F3D3NL6D3BU11BLGHG",
"BD9U6E3F3D3NL6D3BU11BL2D0BL2D0", "BD9U6E3F3D3NL6D3BU11BL3D0",
"BD9U3NR3U3E3NR3D4NR3D5R3", "BR4NF2L2G2D5F2R2E2BG3DL",
"NR6D4NR5D5R6BU10BL3H", "NR6D4NR5D5R6BU10BL3E", "NR6D4NR5D5R6BU10BL2HG",
"NR6D4NR5D5R6BU11BL2D0BL2D0", "BRR2NR2D9NL2R2BU10BL2H",
"BRR2NR2D9NL2R2BU10BL2E", "BRR2NR2D9NL2R2BU10BLHG",
"BRR2NR2D9NL2R2BU11BLD0BL2D0", // C0-CF
"BD4RNRD5R2E3U3H3L2D4", "ND9F2DFDFDF2U9BU2BLGHG", "BR2G2D5F2R2E2U5H2L2BEH",
"BR2G2D5F2R2E2U5H2L2BEE", "BR2G2D5F2R2E2U5H2L2BUEF",
"BR2G2D5F2R2E2U5H2L2BUEFE", "BR2G2D5F2R2E2U5H2L2BU2D0BR2D0", "BDF3NE3NG3F3",
"BR2G2D5F2R2E2U5H2L2BR4G2DGDGDG2", "D7F2R2E2U7BL3BUH", "D7F2R2E2U7BL3BUE",
"D7F2R2E2U7BL2BUHG", "D7F2R2E2U7BH2D0BL2D0", "D3F2RND4RE2U3BL3BUE",
"D7ND2R4E2UH2L4", "BD9U7E2R2FDG2DFRFDGL3", // D0-DF
"BF6G3LH2U2E2R3FD5BU8BL3H", "BF6G3LH2U2E2R3FD5BU8BL3E",
"BF6G3LH2U2E2R3FD5BU8BL2HG", "BF6G3LH2U2E2R3FD5BU9BLGHG",
"BF6G3LH2U2E2R3FD5BU8BL2D0BL2D0", "BF6G3LH2U2E2R3FD5BU8BL3D0",
"BD4ERFD4GLHUER5U2HLGD4FRE", "BR6BD4HL3G2D2F2R3EBG2NUDL",
"BD6R6UH2L2G2D2F2R3EBU7BL3H", "BD6R6UH2L2G2D2F2R3EBU7BL3E",
"BD6R6UH2L2G2D2F2R3EBU7BL2HG", "BD6R6UH2L2G2D2F2R3EBU7BL2D0BL2D0",
"BR2FBD2D6", "BR4GBD2D6", "BR3NGNFBD3D6", "BR2BDD0BR2D0BLBD2D6", // E0-EF
"BR4DNLNRD3FD2G2L2H2U2E2R2F", "BD3D2ND4E2R2F2D4BU9BLGHG",
"BD5D2F2R2E2U2H2L2G2BE4BLH", "BD5D2F2R2E2U2H2L2G2BE4BLE",
"BD5D2F2R2E2U2H2L2G2BE4HG", "BD5D2F2R2E2U2H2L2G2BE4NEHG",
"BD5D2F2R2E2U2H2L2G2BE4D0BL2D0", "BD4R6BU3BL3D0BD6D0",
"BD5D2F2R2E2U2H2L2NG2BR4G6", "BD3D4F2R2E2ND2U4BH2H",
"BD3D4F2R2E2ND2U4BH2BUG", "BD3D4F2R2E2ND2U4BH2HG",
"BD3D4F2R2E2ND2U4BH2D0BL2D0", "BD3D4F2R2E2NU4D3G2L4BU11BR3E",
"D7ND5F2R2E2U2H2L2G2", "BD3D4F2R2E2NU4D3G2L4BU11BR2D0BR2D0"}; // F0-FF
GS gs = {
// Display settings
fFalse, fTrue, NULL,
// Macro accessible only settings
0, 0, 1, 0, fOn, fTrue, fFalse, 0x1F3, 0x008};
/*
******************************************************************************
** Bitmap Primitives
******************************************************************************
*/
// Allocate a new bitmap of a given size.
flag CMon::FAllocate(int x, int y, CONST CMap *pbOld)
{
long cb;
if (x < 0 || y < 0 || x > xBitmap || y > yBitmap) {
PrintSzNN_E("Can't create bitmap larger than %d by %d!\n",
xBitmap, yBitmap);
return fFalse;
}
cb = CbBitmap(x, y);
if (cb < 0) {
PrintSzNN_E("Can't allocate bitmap of size %d by %d!\n", x, y);
return fFalse;
}
m_rgb = (byte *)PAllocate(cb);
if (m_rgb == NULL)
return fFalse;
m_x = x; m_y = y;
m_clRow = CbBitmapRow(x) >> 2;
m_cfPix = 1;
// Inherit the client fields (i.e. 3D dimensions) from passed in bitmap.
if (pbOld != NULL)
Copy3(*pbOld);
else {
m_x3 = wClient1Def; m_y3 = wClient2Def;
m_z3 = wClient3Def; m_w3 = wClient4Def;
}
return fTrue;
}
// Turn off a pixel in a bitmap.
void CMon::Set0(int x, int y)
{
if (!FLegal(x, y))
return;
if (gs.fTraceDot && FVisible())
ScreenDot(x, y, fOff, ~0);
*_Pl(x, y) &= ~Lf(x);
}
// Turn on a pixel in a bitmap.
void CMon::Set1(int x, int y)
{
if (!FLegal(x, y))
return;
if (gs.fTraceDot && FVisible())
ScreenDot(x, y, fOn, ~0);
*_Pl(x, y) |= Lf(x);
}
// Invert a pixel in a bitmap.
void CMon::Inv(int x, int y)
{
if (!FLegal(x, y))
return;
if (gs.fTraceDot && FVisible())
ScreenDot(x, y, !_Get(x, y), ~0);
*_Pl(x, y) ^= Lf(x);
}
// Return the status of a pixel in a bitmap. Pixels not on the bitmap are
// assumed to be off.
KV CMon::Get(int x, int y) CONST
{
if (!FLegal(x, y))
return fOff;
return _Get(x, y);
}
// Set the status of a pixel in a bitmap. Does nothing if an attempt is made
// to set a pixel not on the bitmap.
void CMon::Set(int x, int y, KV kv)
{
if (!FLegal(x, y))
return;
if (gs.fTraceDot && FVisible())
ScreenDot(x, y, kv, ~0);
if (kv)
*_Pl(x, y) |= Lf(x);
else
*_Pl(x, y) &= ~Lf(x);
}
// Force coordinates to be within the bounds of a bitmap, moving them to the
// edge of the bitmap if not within it already.
void CMap::Legalize(int *x, int *y) CONST
{
if (*x < 0)
*x = 0;
else if (*x >= m_x)
*x = m_x-1;
if (*y < 0)
*y = 0;
else if (*y >= m_y)
*y = m_y-1;
}
// Force coordinates to be within the bounds of a bitmap, wrapping them around
// to the other edge of the bitmap if not within it already.
void CMap::Legalize2(int *x, int *y) CONST
{
while (*x < 0)
*x += m_x;
while (*x >= m_x)
*x -= m_x;
while (*y < 0)
*y += m_y;
while (*y >= m_y)
*y -= m_y;
}
/*
******************************************************************************
** Bitmap Block Editing
******************************************************************************
*/
// Set all pixels within a rectangle in a bitmap.
void CMon::Block(int x1, int y1, int x2, int y2, KV o)
{
int x, y;
long il1, il2, il, l, l1, l2;
Legalize(&x1, &y1); Legalize(&x2, &y2);
SortN(&x1, &x2);
SortN(&y1, &y2);
// Fastest case: If the horizontal coordinates cover the whole width of the
// bitmap, it covers consecutive memory addresses. Set 32 pixels at a time.
if (x1 == 0 && x2 == m_x-1) {
il1 = _Il(x1, y1);
il2 = _Il(x2, y2);
l = o ? dwSet : 0;
while (il1 <= il2)
*_Pl(il1++) = l;
goto LDone;
}
// Fast case: Can still set 32 pixels at a time, just need to do each row
// separately, and calculate the bit pattern for start and end of each row.
il1 = _Il(x1, y1); il2 = _Il(x2, y1);
l1 = ~((1L << (x1-1 & 31 ^ 7)) - 1 ^ (255L << (x1-1 & 24)));
l2 = ((1L << (x2 & 31 ^ 7)) - 1 ^ (255L << (x2 & 24)));
for (y = y1; y <= y2; y++) {
for (il = il1; il <= il2; il++) {
l = dwSet;
if (il == il1 && (x1 & 31) > 0)
l &= l1;
if (il == il2)
l &= l2;
if (o)
*_Pl(il) |= l;
else
*_Pl(il) &= ~l;
}
il1 += m_clRow; il2 += m_clRow;
}
// Need to update the screen if Show Pixel Edits is on.
LDone:
if (gs.fTraceDot && FVisible())
for (y = y1; y <= y2; y++)
for (x = x1; x <= x2; x++)
ScreenDot(x, y, o, ~0);
}
// Invert all pixels within a rectangle in a bitmap.
void CMap::BlockReverse(int x1, int y1, int x2, int y2)
{
int x, y;
Legalize(&x1, &y1); Legalize(&x2, &y2);
SortN(&x1, &x2);
SortN(&y1, &y2);
for (y = y1; y <= y2; y++)
for (x = x1; x <= x2; x++)
Inv(x, y);
}
// Set pixels around the border of a rectangle in a bitmap.
void CMap::Box(int x1, int y1, int x2, int y2, int xsiz, int ysiz, KV kv)
{
SortN(&x1, &x2);
SortN(&y1, &y2);
Block(x1, y1, x2, y1 + ysiz - 1, kv);
if (y1 + ysiz < y2) {
Block(x1, y1 + ysiz, x1 + xsiz - 1, y2 - ysiz, kv);
Block(x2 - xsiz + 1, y1 + ysiz, x2, y2 - ysiz, kv);
}
Block(x1, y2 - ysiz + 1, x2, y2, kv);
}
// Copy pixels in a rectangle from one bitmap to another bitmap. If the
// bitmaps are the same, the rectangles should not overlap.
void CMon::BlockMove(CONST CMap &b, int x1, int y1, int x2, int y2,
int x0, int y0)
{
CONST CMon &b1 = dynamic_cast<CONST CMon &>(b);
int x, y, xT, yT;
long il1, il2, il0;
Assert(!b.FColor());
SortN(&x1, &x2);
SortN(&y1, &y2);
// Fast case: If source and destination bitmaps have the same width, and the
// horizontal spans cover the whole bitmap width, and source and destination
// rentangles are within the bounds of their bitmaps, both source and dest
// rectangles cover consecutive memory addresses. Copy 32 pixels at a time.
if (b1.m_x == m_x &&
x1 == 0 && x2 == b1.m_x-1 && y1 >= 0 && y2 < b1.m_y &&
x0 == 0 && y0 >= 0 && y0+(y2-y1) < m_y) {
il1 = b1._Il(x1, y1);
il2 = b1._Il(x2, y2);
il0 = _Il(x0, y0);
while (il1 <= il2)
*_Pl(il0++) = *b1._Pl(il1++);
return;
}
// Normal case: Copy one pixel at a time from source to dest rectangle.
for (y = y1; y <= y2; y++)
for (x = x1; x <= x2; x++) {
xT = x0+(x-x1); yT = y0+(y-y1);
if (FLegal(xT, yT))
Set(xT, yT, b1.Get(x, y));
}
}
// Copy pixels in a rectangle from one bitmap to another bitmap, combining
// them using the specified logical operator table.
void CMon::BlockMoveOrAnd(CONST CMon &b1, int x1, int y1, int x2, int y2,
int x0, int y0, CONST int *rgf)
{
int x, y, xT, yT;
SortN(&x1, &x2);
SortN(&y1, &y2);
for (y = y1; y <= y2; y++)
for (x = x1; x <= x2; x++) {
xT = x0+(x-x1); yT = y0+(y-y1);
if (FLegal(xT, yT))
Set(xT, yT, rgf[b1.Get(x, y) + Get(xT, yT)]);
}
}
/*
******************************************************************************
** Bitmap Line Drawing
******************************************************************************
*/
// Draw a horizontal line on a bitmap.
void CMon::LineX(int x1, int x2, int y, KV o)
{
int x;
long il1, il2, il, l;
// Don't worry about pixels that are off the bitmap.
if (y < 0 || y >= m_y)
return;
SortN(&x1, &x2);
if (x1 < 0)
x1 = 0;
if (x2 >= m_x)
x2 = m_x-1;
// Quickly draw the line, setting up to 32 pixels at a time.
il1 = _Il(x1, y); il2 = _Il(x2, y);
for (il = il1; il <= il2; il++) {
l = dwSet;
if (il == il1 && (x1 & 31) > 0)
l &= ~((1L << (x1-1 & 31 ^ 7)) - 1 ^ (255 << (x1-1 & 24)));
if (il == il2)
l &= ((1L << (x2 & 31 ^ 7)) - 1 ^ (255 << (x2 & 24)));
if (o)
*_Pl(il) |= l;
else
*_Pl(il) &= ~l;
}
// Need to update the screen if Show Pixel Edits is on.
if (gs.fTraceDot && FVisible())
for (x = x1; x <= x2; x++)
ScreenDot(x, y, o, ~0);
}
// Draw a vertical line on a bitmap.
void CMon::LineY(int x, int y1, int y2, KV o)
{
int y;
long il, lf;
// Don't worry about pixels that are off the bitmap.
if (x < 0 || x >= m_x)
return;
SortN(&y1, &y2);
if (y1 < 0)
y1 = 0;
if (y2 >= m_y)
y2 = m_y-1;
// Quickly draw the line, where things like the bit mask and memory address
// only need to be calculated once.
il = _Il(x, y1);
if (o) {
lf = Lf(x);
for (y = y1; y <= y2; y++) {
*_Pl(il) |= lf;
il += m_clRow;
}
} else {
lf = ~Lf(x);
for (y = y1; y <= y2; y++) {
*_Pl(il) &= lf;
il += m_clRow;
}
}
// Need to update the screen if Show Pixel Edits is on.
if (gs.fTraceDot && FVisible())
for (y = y1; y <= y2; y++)
ScreenDot(x, y, o, ~0);
}
// Draw a diagonal line of the specified tilt on a bitmap.
void CMap::LineZ(int x, int y1, int y2, int dir, KV o)
{
int i, j;
if (NAbs(dir) <= 1) {
for (i = 0; i <= y1 - y2; i++)
Set(x + i*dir, y1 - i, o);
} else {
j = dir < 0 ? -1 : 1;
for (i = 0; i <= y1 - y2; i++)
LineX(x + i*dir, x + (i+1)*dir - j, y1 - i, o);
}
}
// Draw a line between any two points on a bitmap. This is an implementation
// of Bresenham's algorithm.
void CMon::Line(int x1, int y1, int x2, int y2, KV o)
{
int x = x1, y = y1, dx = x2 - x1, dy = y2 - y1, xInc, yInc, xInc2, yInc2,
d, dInc, z, zMax;
flag fAllLegal = FLegal(x1, y1) && FLegal(x2, y2);
// Determine slope.
if (NAbs(dx) >= NAbs(dy)) {
xInc = NSgn(dx); yInc = 0;
xInc2 = 0; yInc2 = NSgn(dy);
zMax = NAbs(dx); dInc = NAbs(dy);
d = zMax - (!FOdd(dx) && x1 > x2);
} else {
xInc = 0; yInc = NSgn(dy);
xInc2 = NSgn(dx); yInc2 = 0;
zMax = NAbs(dy); dInc = NAbs(dx);
d = zMax - (!FOdd(dy) && y1 > y2);
}
d >>= 1;
// Loop over long axis, adjusting short axis for slope as needed.
for (z = 0; z <= zMax; z++) {
if (fAllLegal || FLegal(x, y)) {
if (o)
*_Pl(x, y) |= Lf(x);
else
*_Pl(x, y) &= ~Lf(x);
}
x += xInc; y += yInc; d += dInc;
if (d >= zMax) {
x += xInc2; y += yInc2; d -= zMax;
}
}
// Need to update the screen if Show Pixel Edits is on.
if (gs.fTraceDot && FVisible())
UpdateDisplay();
}
// Draw a line between any two points on a bitmap, stopping if a pixel already
// changed is reached.
flag CMon::FLineUntil(int x1, int y1, int x2, int y2, int *xEnd, int *yEnd,
KV o, flag fDraw, flag fWall)
{
int x = x1, y = y1, xLast = x1, yLast = y1, dx = x2 - x1, dy = y2 - y1,
xInc, yInc, xInc2, yInc2, d, dInc, z, zMax;
flag fAllLegal = FLegal(x1, y1) && FLegal(x2, y2);
// Determine slope.
if (NAbs(dx) >= NAbs(dy)) {
xInc = NSgn(dx); yInc = 0;
xInc2 = 0; yInc2 = NSgn(dy);
zMax = NAbs(dx); dInc = NAbs(dy);
d = zMax - (!FOdd(dx) && x1 > x2);
} else {
xInc = 0; yInc = NSgn(dy);
xInc2 = NSgn(dx); yInc2 = 0;
zMax = NAbs(dy); dInc = NAbs(dx);
d = zMax - (!FOdd(dy) && y1 > y2);
}
d >>= 1;
// Loop over long axis, adjusting short axis for slope as needed.
for (z = 0;; z++) {
if (fAllLegal || FLegal(x, y)) {
if (_Get(x, y) != o) {
if (fDraw)
Set(x, y, o);
} else
break;
}
xLast = x; yLast = y;
if (z >= zMax)
break;
x += xInc; y += yInc; d += dInc;
if (d >= zMax) {
x += xInc2; y += yInc2; d -= zMax;
}
}
// Return either the last pixel before the barrier, or the barrier itself.
if (fWall) {
xLast = x; yLast = y;
}
if (xEnd != NULL)
*xEnd = xLast;
if (yEnd != NULL)
*yEnd = yLast;
// Need to update the screen if Show Pixel Edits is on.
if (gs.fTraceDot && FVisible())
UpdateDisplay();
return xLast != x2 || yLast != y2;
}
// Calculate a line between two points, recording the horizontal coordinate at
// each row if it's smaller or larger than the current limits. This is used
// when drawing triangles and quadrilaterals.
void CMap::LineSetup(MM *xminmax, int x1, int y1, int x2, int y2) CONST
{
int x = x1, y = y1, dx = x2 - x1, dy = y2 - y1, xInc, yInc, xInc2, yInc2,
d, dInc, z, zMax;
// Determine slope.
if (NAbs(dx) >= NAbs(dy)) {
xInc = NSgn(dx); yInc = 0;
xInc2 = 0; yInc2 = NSgn(dy);
zMax = NAbs(dx); dInc = NAbs(dy);
d = zMax - (!FOdd(dx) && x1 > x2);
} else {
xInc = 0; yInc = NSgn(dy);
xInc2 = NSgn(dx); yInc2 = 0;
zMax = NAbs(dy); dInc = NAbs(dx);
d = zMax - (!FOdd(dy) && y1 > y2);
}
d >>= 1;
// Loop over long axis, adjusting short axis for slope as needed.
for (z = 0; z <= zMax; z++) {
if (y >= 0 && y < m_y) {
if (x < xminmax[y].min)
xminmax[y].min = x;
if (x > xminmax[y].max)
xminmax[y].max = x;
}
x += xInc; y += yInc; d += dInc;
if (d >= zMax) {
x += xInc2; y += yInc2; d -= zMax;
}
}
}
// Draw a filled in triangle on a bitmap, defined by three points.
flag CMon::FTriangle(int x1, int y1, int x2, int y2, int x3, int y3, int k)
{
MM rgmm[zBitmapStack], *pmm = NULL, *xminmax;
int ymin, ymax, y, yT, xmax, x;
if (m_y <= zBitmapStack)
xminmax = rgmm;
else {
pmm = RgAllocate(m_y, MM);
if (pmm == NULL)
return fFalse;
xminmax = pmm;
}
ymin = NMax(NMin(Min(y1, y2), y3), 0);
ymax = NMin(NMax(Max(y1, y2), y3), m_y - 1);
for (y = ymin; y <= ymax; y++) {
xminmax[y].min = xBitmap;
xminmax[y].max = -1;
}
LineSetup(xminmax, x1, y1, x2, y2);
LineSetup(xminmax, x2, y2, x3, y3);
LineSetup(xminmax, x3, y3, x1, y1);
// Draw one horizontal line per row.
if (k >= 0) {
for (y = ymin; y <= ymax; y++)
LineX(xminmax[y].min, xminmax[y].max, y, k);
} else {
neg(k);
for (y = ymin; y <= ymax; y++) {
yT = y & 3;
xmax = Min(xminmax[y].max, m_x - 1);
for (x = Max(xminmax[y].min, 0); x <= xmax; x++)
Set(x, y, FDitherCore(k, x & 3, yT));
}
}
if (pmm != NULL)
DeallocateP(pmm);
return fTrue;
}
// Draw a filled in four sided quadrilateral on a bitmap.
flag CMon::FQuadrilateral(int x1, int y1, int x2, int y2, int x3, int y3,
int x4, int y4, int k)
{
MM rgmm[zBitmapStack], *pmm = NULL, *xminmax;
int ymin, ymax, y, yT, xmax, x;
if (m_y <= zBitmapStack)
xminmax = rgmm;
else {
pmm = RgAllocate(m_y, MM);
if (pmm == NULL)
return fFalse;
xminmax = pmm;
}
ymin = NMax(NMin(NMin(Min(y1, y2), y3), y4), 0);
ymax = NMin(NMax(NMax(Max(y1, y2), y3), y4), m_y - 1);
for (y = ymin; y <= ymax; y++) {
xminmax[y].min = xBitmap;
xminmax[y].max = -1;
}
LineSetup(xminmax, x1, y1, x2, y2);
LineSetup(xminmax, x2, y2, x3, y3);
LineSetup(xminmax, x3, y3, x4, y4);
LineSetup(xminmax, x4, y4, x1, y1);
// Since one horizontal line is drawn per row, the quadrilateral should be
// convex, or at least not concave any along the horizontal axis.
if (k >= 0) {
for (y = ymin; y <= ymax; y++)
LineX(xminmax[y].min, xminmax[y].max, y, k);
} else {
neg(k);
for (y = ymin; y <= ymax; y++) {
yT = y & 3;
xmax = Min(xminmax[y].max, m_x - 1);
for (x = Max(xminmax[y].min, 0); x <= xmax; x++)
Set(x, y, FDitherCore(k, x & 3, yT));
}
}
if (pmm != NULL)
DeallocateP(pmm);
return fTrue;
}
/*
******************************************************************************
** Bitmap Curve Drawing
******************************************************************************
*/
// Draw a filled in circle or ellipse, within a rectangle on a bitmap.
void CMap::Disk(int x1, int y1, int x2, int y2, KV kv)
{
int rx, ry, r, i, j, iT, jT, q, qLo, qHi, m1, m2, n1, n2;
// This efficient algorithm has no calculations more complicated than
// addition (and multiplication to proportion in the case of an ellipse).
rx = NAbs(x2 - x1) >> 1; ry = NAbs(y2 - y1) >> 1;
if (rx == 0 || ry == 0) {
Block(x1, y1, x2, y2, kv);
return;
}
r = Max(rx, ry);
j = r; q = r+1; qLo = 1; qHi = r+r-1;
m1 = (x1 + x2) >> 1; m2 = m1 + FOdd(x2 - x1);
n1 = (y1 + y2) >> 1; n2 = n1 + FOdd(y2 - y1);
for (i = 0; i <= r; i++) {
iT = (rx <= ry) ? i : i * ry / rx;
jT = (rx >= ry) ? j : j * rx / ry;
LineX(m1 - jT, m2 + jT, n1 - iT, kv);
LineX(m1 - jT, m2 + jT, n2 + iT, kv);
q -= qLo;
while (q < 0) {
q += qHi;
qHi -= 2;
j--;
}
qLo += 2;
}
}
// Draw an outline of a circle or ellipse, within a rectangle on a bitmap.
void CMap::Circle(int x1, int y1, int x2, int y2, KV kv)
{
int rx, ry, r, imax, i, j, i1, i2, j1, j2, q, qLo, qHi, m1, m2, n1, n2;
// This efficient algorithm has no calculations more complicated than
// addition (and multiplication to proportion in the case of an ellipse).
rx = NAbs(x2 - x1) >> 1; ry = NAbs(y2 - y1) >> 1;
if (rx == 0 || ry == 0) {
Block(x1, y1, x2, y2, kv);
return;
}
r = Max(rx, ry);
j = r; q = r+1; qLo = 1; qHi = r+r-1;
m1 = (x1 + x2) >> 1; m2 = m1 + FOdd(x2 - x1);
n1 = (y1 + y2) >> 1; n2 = n1 + FOdd(y2 - y1);
imax = NMultDiv(r + 1, 708, 1000);
for (i = 0; i <= imax; i++) {
i1 = j2 = j; j1 = i2 = i;
if (rx < ry) {
i1 = i1 * rx / ry; i2 = i2 * rx / ry;
} else if (ry < rx) {