Some tweaks and fixups to the gradiation rectangles. Clipping and zoom mode work better, but :

-I introduced some weird bug making lines appear on the screen when drawing outside the limits of the zoom in zoom mode. Seems there is a XOR line function that get called with negative coordinates
-The preview rectangle is drawn with XOR-lines on the screen and does not modify the picture. So it is possible to erase it in the zoom screen by moving the cursor around it.
-Maybe I missed some testcases, i did not manage to reproduce the problem trigerred by grid clipping, for one.
-The gradiation vector is horizontal when it should be inclined. I probably missed something when writing the code for it. Probably a division gets out of precision... i should check if i used floats where needed


git-svn-id: svn://pulkomandy.tk/GrafX2/trunk@339 416bcca6-2ee7-4201-b75f-2eb2f807beb1

graph.c

@@ -5246,6 +5246,16 @@ void Tracer_rectangle_degrade(short RAX,short RAY,short RBX,short RBY,short VAX,
 	RAY = Pos_Y;
     }
 
+    // Correction des bornes d'après les limites
+    if (RAY<Limite_Haut)
+	RAY=Limite_Haut;
+    if (RBY>Limite_Bas)
+	RBY=Limite_Bas;
+    if (RAX<Limite_Gauche)
+	RAX=Limite_Gauche;
+    if (RBX>Limite_Droite)
+	RBX=Limite_Droite;
+
     if(VBX == VAX)
     {
 	// Le vecteur est vertical, donc on évite la partie en dessous qui foirerait avec une division par 0...