Fix:Core:Use table instead of fixed value for scale calculation|Thanks odlg for the patch

git-svn-id: http://svn.code.sf.net/p/navit/code/trunk/navit@2309 ffa7fe5e-494d-0410-b361-a75ebd5db220

1 files changed, 15 insertions, 1 deletions

diff --git a/navit/transform.c b/navit/transform.c
index c336e01f2..c1a97bb6b 100644
--- a/navit/transform.c
+++ b/navit/transform.c
@@ -868,6 +868,20 @@ transform_scale(int y)
 #ifdef AVOID_FLOAT
 static int
 tab_sqrt[]={14142,13379,12806,12364,12018,11741,11517,11333,11180,11051,10943,10850,10770,10701,10640,10587,10540,10499,10462,10429,10400,10373,10349,10327,10307,10289,10273,10257,10243,10231,10219,10208};
+
+static int tab_int_step = 0x20000;
+static int tab_int_scale[]={10000,10002,10008,10019,10033,10052,10076,10103,10135,10171,10212,10257,10306,10359,10417,10479,10546,10617,10693,10773,10858,10947,11041,11140,11243,11352,11465,11582,11705,11833,11965,12103,12246,12394,12547,12706,12870,13039,13214,13395,13581,13773,13971,14174,14384,14600,14822,15050,15285,15526,15774,16028,16289,16557,16832,17114,17404,17700,18005,18316,18636,18964,19299,19643,19995,20355,20724,21102,21489,21885,22290,22705,23129,23563,24007,24461,24926,25401,25886,26383,26891};
+
+int transform_int_scale(int y)
+{
+	int a=tab_int_step,i,size = sizeof(tab_int_scale)/sizeof(int);
+	if (y < 0)
+		y=-y;
+	i=y/tab_int_step;
+	if (i >= size)
+		i=size-1;
+	return tab_int_scale[i];
+}
 #endif
 
 double
@@ -880,7 +894,7 @@ transform_distance(enum projection pro, struct coord *c1, struct coord *c2)
 	dy=c1->y-c2->y;
 	return sqrt(dx*dx+dy*dy)/scale;
 #else
-	int dx,dy,f,scale=15539;
+	int dx,dy,f,scale=transform_int_scale((c1->y+c2->y)/2);
 	dx=c1->x-c2->x;
 	dy=c1->y-c2->y;
 	if (dx < 0)