Changeset 16256 for trunk/Ohana/src/kapa2/src/CursorOps.c

Timestamp:

Jan 27, 2008, 1:24:12 PM (18 years ago)

Author:

eugene

Message:

unified zoom and remap functions to include flips and wide-view image

File:

• trunk/Ohana/src/kapa2/src/CursorOps.c (modified) (3 diffs)

trunk/Ohana/src/kapa2/src/CursorOps.c

@@ -1 +1 @@
 # include "Ximage.h"
 
-void Screen_to_Image (double *x1, double *y1, double x2, double y2, Picture *picture) {
+// input coordinates are relative to the picture bounding box
+void Picture_to_Image (double *x1, double *y1, double x2, double y2, Picture *picture) {
 
-  double xs, ys, expand;
+  double expand;
 
   expand = 1.0;
@@ -12 +13 @@
   }
   
-  // pixel coordinates in picture frame
-  xs = x2 - picture[0].x;
-  ys = y2 - picture[0].y;
-
-  // picture[0].X,Y is the offset relative to picture[0].Xo,Yo
-  *x1 = expand*(xs - 0.5*picture[0].dx) + picture[0].Xo - picture[0].X;
-  *y1 = expand*(ys - 0.5*picture[0].dy) + picture[0].Yo - picture[0].Y;
+  // picture[0].X,Y is the image coordinate in the center of the picture
+  *x1 = expand*(x2 - 0.5*picture[0].dx) + picture[0].X;
+  *y1 = expand*(y2 - 0.5*picture[0].dy) + picture[0].Y;
 }
 
-void Image_to_Screen (double *x1, double *y1, double x2, double y2, Picture *picture) {
+// input coordinates are relative to the X window
+void Screen_to_Image (double *x1, double *y1, double x2, double y2, Picture *picture) {
 
-  double xs, ys, expand;
+  double xp, yp;
+
+  // pixel coordinates in picture frame
+  xp = x2 - picture[0].x;
+  yp = y2 - picture[0].y;
+
+  Picture_to_Image (x1, y1, xp, yp, picture);
+}
+
+void Image_to_Picture (double *x1, double *y1, double x2, double y2, Picture *picture) {
+
+  double expand;
 
   /* notice that here, expand is the reciprocal of the expand above */
@@ -34 +43 @@
   
   // pixel coordinates in picture frame
-  xs = expand*(x2 - picture[0].Xo + picture[0].X) + 0.5*picture[0].dx;
-  ys = expand*(y2 - picture[0].Yo + picture[0].Y) + 0.5*picture[0].dy;
+  *x1 = expand*(x2 - picture[0].X) + 0.5*picture[0].dx;
+  *y1 = expand*(y2 - picture[0].Y) + 0.5*picture[0].dy;
+}
+
+void Image_to_Screen (double *x1, double *y1, double x2, double y2, Picture *picture) {
+
+  double xp, yp;
+
+  Image_to_Picture (&xp, &yp, x2, y2, picture);
 
   // pixel coordinates in screen frame
-  *x1 = xs + picture[0].x;
-  *y1 = ys + picture[0].y;
+  *x1 = xp + picture[0].x;
+  *y1 = yp + picture[0].y;
 }
 
+// input coordinates are relative to the picture bounding box
+void Picture_Lower (int *i_start, int *j_start, Matrix *matrix, Picture *picture) {
+
+  double Ix, Iy, Sx, Sy;
+
+  // Ix, Iy are the image coordinates of the specified screen pixel
+  Picture_to_Image (&Ix, &Iy, 0.0, 0.0, picture);
+
+  // Ix, Iy are now limited to valid image coordinates
+  Ix = MIN (MAX (Ix, 0), matrix[0].Naxis[0]);
+  Iy = MIN (MAX (Iy, 0), matrix[0].Naxis[1]);
+
+  // round up to nearest pixel boundary
+  if (Ix > (int)(Ix)) Ix = (int)(Ix) + 1;
+  if (Iy > (int)(Iy)) Iy = (int)(Iy) + 1;
+
+  // Sx, Sy are the screen coordinates of the Ix,Iy pixel
+  Image_to_Picture (&Sx, &Sy, Ix, Iy, picture);
+
+  // i_start, j_start are now limited to valid screen coordinates
+  *i_start = MIN (MAX (Sx, 0), picture[0].dx);
+  *j_start = MIN (MAX (Sy, 0), picture[0].dy);
+}
+  
+// input coordinates are relative to the picture bounding box
+void Picture_Upper (int *i_end, int *j_end, Matrix *matrix, Picture *picture) {
+
+  double Ix, Iy, Sx, Sy;
+
+  // Ix, Iy are the image coordinates of the specified screen pixel
+  Picture_to_Image (&Ix, &Iy, picture[0].dx, picture[0].dy, picture);
+
+  // Ix, Iy are now limited to valid image coordinates
+  Ix = MIN (MAX (Ix, 0), matrix[0].Naxis[0]);
+  Iy = MIN (MAX (Iy, 0), matrix[0].Naxis[1]);
+
+  // round down to nearest pixel boundary
+  if (Ix > (int)(Ix)) Ix = (int)(Ix);
+  if (Iy > (int)(Iy)) Iy = (int)(Iy);
+
+  // Sx, Sy are the screen coordinates of the Ix,Iy pixel
+  Image_to_Picture (&Sx, &Sy, Ix, Iy, picture);
+
+  // i_start, j_start are now limited to valid screen coordinates
+  *i_end = MIN (MAX (Sx, 0), picture[0].dx);
+  *j_end = MIN (MAX (Sy, 0), picture[0].dy);
+}