/**
* Given cursor position and an actor number, ascertains
* whether the cursor is within the actor's tag area.
* Returns True for a positive result, False for negative.
*/
bool InHotSpot(int ano, int curX, int curY) {
int aTop, aBot; // Top and bottom limits }
int aHeight; // Height } of active area
int aLeft, aRight; // Left and right }
int aWidth; // Width }
unsigned topEighth, botEighth, leftEighth, rightEighth;
// First check if within broad range
if (curX < (aLeft = GetActorLeft(ano)) // too far left
|| curX > (aRight = GetActorRight(ano)) // too far right
|| curY < (aTop = GetActorTop(ano)) // too high
|| curY > (aBot = GetActorBottom(ano)) ) // too low
return false;
GetActorTagPortion(ano, &topEighth, &botEighth, &leftEighth, &rightEighth);
aWidth = aRight - aLeft;
aLeft += ((leftEighth - 1)*aWidth)/8;
aRight -= ((8 - rightEighth)*aWidth)/8;
// check if within x-range
if (curX < aLeft || curX > aRight)
return false;
aHeight = aBot - aTop;
aTop += ((topEighth - 1)*aHeight)/8;
aBot -= ((8 - botEighth)*aHeight)/8;
// check if within y-range
if (curY < aTop || curY > aBot)
return false;
return true;
}
/**
* Given cursor position and an actor number, ascertains whether the
* cursor is within the actor's tag area.
* Returns TRUE for a positive result, FALSE for negative.
* If TRUE, the mid-top co-ordinates of the actor's tag area are also
* returned.
*/
static bool InHotSpot(int ano, int aniX, int aniY, int *pxtext, int *pytext) {
int Top, Bot; // Top and bottom limits of active area
int left, right; // left and right of active area
int qrt = 0; // 1/4 of height (sometimes 1/2)
// First check if within x-range
if (aniX > (left = GetActorLeft(ano)) && aniX < (right = GetActorRight(ano))) {
Top = GetActorTop(ano);
Bot = GetActorBottom(ano);
// y-range varies according to tag-type
switch (TagType(ano)) {
case TAG_DEF:
// Next to bottom 1/4 of the actor's area
qrt = (Bot - Top) >> 1; // Half actor's height
Top += qrt; // Top = mid-height
qrt = qrt >> 1; // Quarter height
Bot -= qrt; // Bot = 1/4 way up
break;
case TAG_Q1TO3:
// Top 3/4 of the actor's area
qrt = (Bot - Top) >> 2; // 1/4 actor's height
Bot -= qrt; // Bot = 1/4 way up
break;
case TAG_Q1TO4:
// All the actor's area
break;
default:
error("illegal tag area type");
}
// Now check if within y-range
if (aniY >= Top && aniY <= Bot) {
if (TagType(ano) == TAG_Q1TO3)
*pytext = Top + qrt;
else
*pytext = Top;
*pxtext = (left + right) / 2;
return true;
}
}
/**
* See if the actor on whom the camera is is approaching an edge.
* Request a scroll if he is.
*/
static void MonitorScroll() {
int newx, newy;
int Loffset, Toffset;
/*
* Only do it if the actor is there and is visible
*/
if (!g_pScrollMover || MoverHidden(g_pScrollMover) || !MoverIs(g_pScrollMover))
return;
GetActorPos(g_scrollActor, &newx, &newy);
if (g_oldx == newx && g_oldy == newy)
return;
PlayfieldGetPos(FIELD_WORLD, &Loffset, &Toffset);
/*
* Approaching right side or left side of the screen?
*/
if (newx > Loffset+SCREEN_WIDTH - RLDISTANCE && Loffset < g_ImageW - SCREEN_WIDTH) {
if (newx > g_oldx)
NeedScroll(LEFT);
} else if (newx < Loffset + RLDISTANCE && Loffset) {
if (newx < g_oldx)
NeedScroll(RIGHT);
}
/*
* Approaching bottom or top of the screen?
*/
if (newy > Toffset+SCREEN_HEIGHT-DDISTANCE && Toffset < g_ImageH-SCREEN_HEIGHT) {
if (newy > g_oldy)
NeedScroll(UP);
} else if (Toffset && newy < Toffset + UDISTANCE + GetActorBottom(g_scrollActor) - GetActorTop(g_scrollActor)) {
if (newy < g_oldy)
NeedScroll(DOWN);
}
g_oldx = newx;
g_oldy = newy;
}
/**
* GetActorTagPos
*/
void GetActorTagPos(int actor, int *pTagX, int *pTagY, bool bAbsolute) {
unsigned topEighth, botEighth;
int aTop; // Top and bottom limits }
int aHeight; // Height } of active area
int Loffset, Toffset;
GetActorTagPortion(actor, &topEighth, &botEighth, (unsigned *)&Loffset, (unsigned *)&Toffset);
aTop = GetActorTop(actor);
aHeight = GetActorBottom(actor) - aTop;
aTop += ((topEighth - 1) * aHeight) / 8;
*pTagX = ((GetActorLeft(actor) + GetActorRight(actor)) / 2);
*pTagY = aTop;
if (!bAbsolute) {
PlayfieldGetPos(FIELD_WORLD, &Loffset, &Toffset);
*pTagX -= Loffset;
*pTagY -= Toffset;
}
}
