X-Git-Url: https://git.ucc.asn.au/?p=atyndall%2Fcits2231.git;a=blobdiff_plain;f=scene.c;h=fe7eca37774708dd85a9a986f2d8db1c689d956c;hp=a706c5e44d4f7c167f29174a6b75a175571460af;hb=1fa55b75f0e3b1acf1245362cebaf5baa86f93f7;hpb=c721e772ebfd5bae455e30616551c654834767ca

diff --git a/scene.c b/scene.c
index a706c5e..fe7eca3 100644
--- a/scene.c
+++ b/scene.c
@@ -305,11 +305,29 @@ void motion(int x, int y) {
         //sceneObjs[curObject].x += (x - startx)*leftrightFactor;
       } else if ( buttonSelected == GLUT_MIDDLE_BUTTON ) {
         // w: big/small, h: up/down
-        float scaling = y*bigsmallFactor;
-        printf("Scaling by %f on all axii\n", scaling);
-        sceneObjs[curObject].scale[0] += scaling;
-        sceneObjs[curObject].scale[1] += scaling;
-        sceneObjs[curObject].scale[2] += scaling;
+
+        // For big/small scaling, we map negative numbers to 0->1 and positive numbers to 1->inf
+        float diff = (y - starty);
+        float map = ( diff + (float)height/2 ) / ( (float)height/2 );
+        float scaling;
+
+        if ( diff < 0 ) {
+          scaling = map;
+        } else {
+          scaling = pow(map, diff);
+        }
+
+        if ( scaling != 0 ) {
+       
+          
+          sceneObjs[curObject].scale[0] *= scaling;
+          sceneObjs[curObject].scale[1] *= scaling;
+          sceneObjs[curObject].scale[2] *= scaling;
+          printf("Diff is %f, Scaling by %f on all axii, 1/map is %f\n", diff, sceneObjs[curObject].scale[0], map);
+
+        }
+
+        starty = y;
       }
 
       startx = x;