1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
|
/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* 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,
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include "agi/agi.h"
#include "common/random.h"
namespace Agi {
int AgiEngine::checkStep(int delta, int step) {
return (-step >= delta) ? 0 : (step <= delta) ? 2 : 1;
}
bool AgiEngine::checkBlock(int16 x, int16 y) {
if (x <= _game.block.x1 || x >= _game.block.x2)
return false;
if (y <= _game.block.y1 || y >= _game.block.y2)
return false;
return true;
}
void AgiEngine::changePos(ScreenObjEntry *screenObj) {
bool insideBlock;
int16 x, y;
int dx[9] = { 0, 0, 1, 1, 1, 0, -1, -1, -1 };
int dy[9] = { 0, -1, -1, 0, 1, 1, 1, 0, -1 };
x = screenObj->xPos;
y = screenObj->yPos;
insideBlock = checkBlock(x, y);
x += screenObj->stepSize * dx[screenObj->direction];
y += screenObj->stepSize * dy[screenObj->direction];
if (checkBlock(x, y) == insideBlock) {
screenObj->flags &= ~fMotion;
} else {
screenObj->flags |= fMotion;
screenObj->direction = 0;
if (isEgoView(screenObj))
setVar(VM_VAR_EGO_DIRECTION, 0);
}
}
void AgiEngine::motionWander(ScreenObjEntry *screenObj) {
uint8 originalWanderCount = screenObj->wander_count;
screenObj->wander_count--;
if ((originalWanderCount == 0) || (screenObj->flags & fDidntMove)) {
screenObj->direction = _rnd->getRandomNumber(8);
if (isEgoView(screenObj)) {
setVar(VM_VAR_EGO_DIRECTION, screenObj->direction);
}
while (screenObj->wander_count < 6) {
screenObj->wander_count = _rnd->getRandomNumber(50); // huh?
}
}
}
void AgiEngine::motionFollowEgo(ScreenObjEntry *screenObj) {
ScreenObjEntry *screenObjEgo = &_game.screenObjTable[SCREENOBJECTS_EGO_ENTRY];
int egoX, egoY;
int objX, objY;
int dir;
egoX = screenObjEgo->xPos + screenObjEgo->xSize / 2;
egoY = screenObjEgo->yPos;
objX = screenObj->xPos + screenObj->xSize / 2;
objY = screenObj->yPos;
// Get direction to reach ego
dir = getDirection(objX, objY, egoX, egoY, screenObj->follow_stepSize);
// Already at ego coordinates
if (dir == 0) {
screenObj->direction = 0;
screenObj->motionType = kMotionNormal;
setFlag(screenObj->follow_flag, true);
return;
}
if (screenObj->follow_count == 0xff) {
screenObj->follow_count = 0;
} else if (screenObj->flags & fDidntMove) {
int d;
while ((screenObj->direction = _rnd->getRandomNumber(8)) == 0) {
}
d = (ABS(egoY - objY) + ABS(egoX - objX)) / 2;
if (d < screenObj->stepSize) {
screenObj->follow_count = screenObj->stepSize;
return;
}
while ((screenObj->follow_count = _rnd->getRandomNumber(d)) < screenObj->stepSize) {
}
return;
}
if (screenObj->follow_count != 0) {
int k;
// DF: this is ugly and I dont know why this works, but
// other line does not! (watcom complained about lvalue)
//
// if (((int8)v->parm3 -= v->step_size) < 0)
// v->parm3 = 0;
k = screenObj->follow_count;
k -= screenObj->stepSize;
screenObj->follow_count = k;
if ((int8) screenObj->follow_count < 0)
screenObj->follow_count = 0;
} else {
screenObj->direction = dir;
}
}
void AgiEngine::motionMoveObj(ScreenObjEntry *screenObj) {
screenObj->direction = getDirection(screenObj->xPos, screenObj->yPos, screenObj->move_x, screenObj->move_y, screenObj->stepSize);
// Update V6 if ego
if (isEgoView(screenObj))
setVar(VM_VAR_EGO_DIRECTION, screenObj->direction);
if (screenObj->direction == 0)
motionMoveObjStop(screenObj);
}
void AgiEngine::checkMotion(ScreenObjEntry *screenObj) {
switch (screenObj->motionType) {
case kMotionNormal:
break;
case kMotionWander:
motionWander(screenObj);
break;
case kMotionFollowEgo:
motionFollowEgo(screenObj);
break;
case kMotionEgo:
case kMotionMoveObj:
motionMoveObj(screenObj);
break;
}
if ((_game.block.active && (~screenObj->flags & fIgnoreBlocks)) && screenObj->direction)
changePos(screenObj);
}
/*
* Public functions
*/
/**
*
*/
void AgiEngine::checkAllMotions() {
ScreenObjEntry *screenObj;
for (screenObj = _game.screenObjTable; screenObj < &_game.screenObjTable[SCREENOBJECTS_MAX]; screenObj++) {
if ((screenObj->flags & (fAnimated | fUpdate | fDrawn)) == (fAnimated | fUpdate | fDrawn)
&& screenObj->stepTimeCount == 1) {
checkMotion(screenObj);
}
}
}
/**
* Check if given entry is at destination point.
* This function is used to updated the flags of an object with move.obj
* type motion that * has reached its final destination coordinates.
* @param v Pointer to view table entry
*/
void AgiEngine::inDestination(ScreenObjEntry *screenObj) {
if (screenObj->motionType == kMotionMoveObj) {
screenObj->stepSize = screenObj->move_stepSize;
setFlag(screenObj->move_flag, true);
}
screenObj->motionType = kMotionNormal;
if (isEgoView(screenObj))
_game.playerControl = true;
}
void AgiEngine::motionMoveObjStop(ScreenObjEntry *screenObj) {
screenObj->stepSize = screenObj->move_stepSize;
// This check for motionType was only done in AGI3.
// But we use this motion type for mouse movement, so we need to check in any case, otherwise it will cause glitches.
if (screenObj->motionType != kMotionEgo) {
setFlag(screenObj->move_flag, true);
}
screenObj->motionType = kMotionNormal;
if (isEgoView(screenObj)) {
_game.playerControl = true;
setVar(VM_VAR_EGO_DIRECTION, 0);
}
}
/**
* Wrapper for static function motion_moveobj().
* This function is used by cmd_move_object() in the first motion cycle
* after setting the motion mode to kMotionMoveObj.
* @param v Pointer to view table entry
*/
void AgiEngine::moveObj(ScreenObjEntry *screenObj) {
motionMoveObj(screenObj);
}
/**
* Get direction from motion coordinates
* This function gets the motion direction from the current and previous
* object coordinates and the step size.
* @param x0 Original x coordinate of the object
* @param y0 Original y coordinate of the object
* @param x x coordinate of the object
* @param y y coordinate of the object
* @param s step size
*/
int AgiEngine::getDirection(int16 objX, int16 objY, int16 destX, int16 destY, int16 stepSize) {
int dirTable[9] = { 8, 1, 2, 7, 0, 3, 6, 5, 4 };
return dirTable[checkStep(destX - objX, stepSize) + 3 * checkStep(destY - objY, stepSize)];
}
} // End of namespace Agi
|
