X-Git-Url: https://git.ucc.asn.au/?p=atyndall%2Fcits2231.git;a=blobdiff_plain;f=scene.c;h=d73df5364263dab880977e948e1f362a23f9c521;hp=7d5456fab079adcea1db91de6b8b74542e6b621d;hb=521d3ab9808ad5d15a32a9470508b4c687304ae1;hpb=84a44257a71818d30cf2bbdea195a0b7d246aa83

diff --git a/scene.c b/scene.c
index 7d5456f..d73df53 100644
--- a/scene.c
+++ b/scene.c
@@ -305,7 +305,17 @@ 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 - starty);//*bigsmallFactor;
+
+        // For big/small scaling, we map negative numbers to 0->1 and positive numbers to 1->inf
+        float diff = (y - starty);
+        float scaling;
+
+        if ( scaling < 0 ) {
+          scaling = (x - -height)/(0 - -height);
+        } else {
+          scaling = diff;
+        }
+        
         printf("Scaling by %f on all axii\n", scaling);
         sceneObjs[curObject].scale[0] += scaling;
         sceneObjs[curObject].scale[1] += scaling;