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fixed crash when drawing a vertical gradiation or a single-point (nonsense) gradiation.

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git-svn-id: svn://pulkomandy.tk/GrafX2/trunk@315 416bcca6-2ee7-4201-b75f-2eb2f807beb1
This commit is contained in:
Adrien Destugues
2008-10-28 09:59:58 +00:00
parent cc81845f7b
commit 72c42b92ce
2 changed files with 35 additions and 37 deletions
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53
graph.c
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@@ -5209,42 +5209,49 @@ void Tracer_rectangle_degrade(short RAX,short RAY,short RBX,short RBY,short VAX,
RAY = Pos_Y;
}
Degrade_Intervalle_total = sqrt(pow(VBY - VAY,2)+pow(VBX - VAX,2));
short a = (VBY - VAY)/(VBX - VAX);
short b = VAY - a*VAX;
int Distance_X, Distance_Y;
DEBUG("inttotal",Degrade_Intervalle_total);
for (Pos_Y=RAY;Pos_Y<RBY;Pos_Y++)
for (Pos_X = RAX;Pos_X<RBX;Pos_X++)
if(VBX == VAX)
{
// On calcule ou on en est dans le dégradé
Distance_X = pow((int)(Pos_Y - VAY),2)+pow((int)(Pos_X - VAX),2);
Distance_Y = pow((int)(-a * Pos_X + Pos_Y - b),2)/(a*a+1);
// Le vecteur est vertical, donc on évite la partie en dessous qui foirerait avec une division par 0...
if (VBY == VAY) return; // L'utilisateur fait n'importe quoi
Degrade_Intervalle_total = abs(VBY - VAY);
for(Pos_Y=RAY;Pos_Y<=RBY;Pos_Y++)
for(Pos_X=RAX;Pos_X<=RBX;Pos_X++)
Traiter_degrade(abs(VBY - Pos_Y),Pos_X,Pos_Y);
printf("%d\t%d\t%d\n",Pos_X,Distance_X,Distance_Y);
Traiter_degrade(sqrt(Distance_X - Distance_Y),Pos_X,Pos_Y);
}
else
{
Degrade_Intervalle_total = sqrt(pow(VBY - VAY,2)+pow(VBX - VAX,2));
short a = (VBY - VAY)/(VBX - VAX);
short b = VAY - a*VAX;
int Distance_X, Distance_Y;
for (Pos_Y=RAY;Pos_Y<=RBY;Pos_Y++)
for (Pos_X = RAX;Pos_X<=RBX;Pos_X++)
{
// On calcule ou on en est dans le dégradé
Distance_X = pow((int)(Pos_Y - VAY),2)+pow((int)(Pos_X - VAX),2);
Distance_Y = pow((int)(-a * Pos_X + Pos_Y - b),2)/(a*a+1);
Traiter_degrade(sqrt(Distance_X - Distance_Y),Pos_X,Pos_Y);
}
}
Mettre_Ecran_A_Jour(RAX,RAY,RBX,RBY);
}
// -- Tracer un polygône plein --
// -- Tracer un polygône plein --
typedef struct POLYGON_EDGE /* an active edge */
{
short top; /* top y position */
short bottom; /* bottom y position */
float x, dx; /* floating point x position and gradient */
float w; /* width of line segment */
struct POLYGON_EDGE *prev; /* doubly linked list */
struct POLYGON_EDGE *next;
short top; /* top y position */
short bottom; /* bottom y position */
float x, dx; /* floating point x position and gradient */
float w; /* width of line segment */
struct POLYGON_EDGE *prev; /* doubly linked list */
struct POLYGON_EDGE *next;
} POLYGON_EDGE;