Passing char * as an argument - c++

Question

I've got a problem in my code. I'm rewriting an existing module that draw graph (from electrical consomation) with GDI+ (yes Visual Studio Microsoft and co)
Here is my code to draw one graph
void CourbeComptage::afficheCourbeJour_nonEDF(CWnd *cwnd)
{
dessin ligne,rectangle,texte;
int i;
int lx = x + margeH;
int ly = y + haut - margeV;
int x1, y1, x2, y2;
if(flagCourbe)
{
afficheGraduation();
// 4 - tracer la courbe de consommation avec des plages horaires
for(i=0;i<24;i++)
{
x1 = lx + i * pasX;
y1 = ly - coorX_conso[i];
x2 = lx + (i + 1) * pasX;
y2 = ly - 1;
plage[i] = (plage[i] > 3) ? 3 : (plage[i] < 1) ? 1 : plage[i];
if(typeCourbe == COURBE_BARRE_3D)
{
drawer->DrawFilledGradientRectangle(x1, y1, x2, y2, gradient[plage[i]], "transparent", 1);
switch(plage[i])
{
case 1: drawer->DrawFilledGradientRectangle(x1, y1, x2, y2, "conso_HC", "transparent", 1); break;
case 2: drawer->DrawFilledGradientRectangle(x1, y1, x2, y2, "conso_HP", "transparent", 1); break;
case 3: drawer->DrawFilledGradientRectangle(x1, y1, x2, y2, "conso_P", "transparent", 1); break;
}
}
else if(typeCourbe == COURBE_BARRE)
{
switch(plage[i])
{
case 1: drawer->DrawFilledSolidRectangle(x1, y1, x2, y2, "conso2_HC", "transparent", 1); break;
case 2: drawer->DrawFilledSolidRectangle(x1, y1, x2, y2, "conso2_HP", "transparent", 1); break;
case 3: drawer->DrawFilledSolidRectangle(x1, y1, x2, y2, "conso2_P", "transparent", 1); break;
}
}
else if(this->typeCourbe == COURBE_LIGNE)
{
if(i!= 23)
{
switch(plage[i])
{
case 1: drawer->DrawLine(lx + pasX/2 + i*pasX, ly - coorX_conso[i], lx + pasX/2 + (i+1)*pasX, ly - coorX_conso[i+1], "conso2_HC"); break;
case 2: drawer->DrawLine(lx + pasX/2 + i*pasX, ly - coorX_conso[i], lx + pasX/2 + (i+1)*pasX, ly - coorX_conso[i+1], "conso2_HP"); break;
case 3: drawer->DrawLine(lx + pasX/2 + i*pasX, ly - coorX_conso[i], lx + pasX/2 + (i+1)*pasX, ly - coorX_conso[i+1], "conso2_P"); break;
}
}
// A ecrire 4 types point x 2 lignes de courbe (conso et react)
}
}
}
}
In order to simplify my code and avoid some test I just want to transform that :
switch(plage[i])
{
case 1: drawer->DrawFilledGradientRectangle(x1, y1, x2, y2, "conso_HC", "transparent", 1); break;
case 2: drawer->DrawFilledGradientRectangle(x1, y1, x2, y2, "conso_HP", "transparent", 1); break;
case 3: drawer->DrawFilledGradientRectangle(x1, y1, x2, y2, "conso_P", "transparent", 1); break;
}
Into that :
drawer->DrawFilledGradientRectangle(x1, y1, x2, y2, gradient[plage[i]], "transparent", 1);
So I rewrite this function like that :
void CourbeComptage::afficheCourbeJour_nonEDF(CWnd *cwnd)
{
static char gradient[4][9] = {"default", "conso_HC", "conso_HP", "conso_P"},
solid[4][10] = {"default", "conso2_HC", "conso2_HP", "conso2_P"};
dessin ligne,rectangle,texte;
int i;
int lx = x + margeH;
int ly = y + haut - margeV;
int x1, y1, x2, y2;
if(flagCourbe)
{
afficheGraduation();
// 4 - tracer la courbe de consommation avec des plages horaires
for(i=0;i<24;i++)
{
x1 = lx + i * pasX;
y1 = ly - coorX_conso[i];
x2 = lx + (i + 1) * pasX;
y2 = ly - 1;
plage[i] = (plage[i] > 3) ? 3 : (plage[i] < 1) ? 1 : plage[i];
if(typeCourbe == COURBE_BARRE_3D)
{
drawer->DrawFilledGradientRectangle(x1, y1, x2, y2, gradient[plage[i]], "transparent", 1);
}
else if(typeCourbe == COURBE_BARRE)
{
drawer->DrawFilledSolidRectangle(x1, y1, x2, y2, solid[plage[i]], "transparent", 1);
}
else if(this->typeCourbe == COURBE_LIGNE)
{
if(i!= 23)
{
drawer->DrawLine(lx + pasX/2 + i*pasX, ly - coorX_conso[i], lx + pasX/2 + (i+1)*pasX, ly - coorX_conso[i+1], solid[plage[i]]);
}
}
}
}
}
And that don't works, meaning that the DrawFilledSolidRectangle (for example) get the string, but it don't draw the rectangle following the color passed in the string.
I don't know why.
I tried to dinamically allocate the two tab gradient and solid but that don't works too.
Here are the prototypes of some functions :
void DrawLine(int x1, int y1, int x2, int y2, char * penName);
void DrawFilledSolidRectangle(int x1, int y1, int x2, int y2, char * colorName, char * borderPen, int borderSize = 1, bool ombre = false);
void DrawFilledGradientRectangle(int x1, int y1, int x2, int y2, char * gradientName, char * borderPen, int borderSize = 1, bool ombre = false);
And here is the code of the DrawFilledSolidRectangle (DrawFilledGradientRectangle is the same except the Brush that is used)
Rect * rects = (Rect *)malloc(borderSize * sizeof(Rect));
Rect * tmp;
int i;
if(ombre) DrawRectangle(x1, y1, x2, y2, borderPen, true);
for(i = 0 ; i < borderSize ; i++)
{
tmp = new Rect(x1+i, y1+i, x2-x1-i, y2-y1-i);
rects[i] = *tmp;
}
DrawRectangles(rects, borderSize, borderPen);
x1 += i;
y1 += i;
x2 -= x1+i;
y2 -= y1-i;
SolidBrush * b = new SolidBrush(couleurs[colorName]);
gNaa->FillRectangle(b, x1, y1, x2, y2);
delete[](rects);
Thanks for your help, and sorry for my english.

Answer 1

Using conditional expressions makes this very simple:
drawer->DrawFilledGradientRectangle(x1, y1, x2, y2, (plage[i] == 1 ? "conso_HC" : (plage[i] == 2 ? "conso_HP" : "conso_P")), "transparent", 1);