[Hackndev-commit] SF.net SVN: hackndev: [817] tsk/trunk/tsk.c

[<ph...@us...>]

Revision: 817
          http://svn.sourceforge.net/hackndev/?rev=817&view=rev
Author:   phiren
Date:     2007-02-14 18:50:59 -0800 (Wed, 14 Feb 2007)

Log Message:
-----------
Added runtime calibration

Modified Paths:
--------------
    tsk/trunk/tsk.c

Modified: tsk/trunk/tsk.c
===================================================================
--- tsk/trunk/tsk.c	2007-02-14 21:13:08 UTC (rev 816)
+++ tsk/trunk/tsk.c	2007-02-15 02:50:59 UTC (rev 817)
@@ -23,25 +23,86 @@
 
 #include "messagease.h"
 
-//You will need to calibrate, the digitizer to the sticker
-//Sorry, later I will include a feature to do this automaticly
-#define TOP 1180 //Top of sticker
-#define BOTTOM 200 // Bottom of sticker
-#define LEFT 240 // Left side of sticker
-#define RIGHT 3760 // Right side
-
 //Don't touch these, they automaticly adjust to the above settings
 #define HEIGHT (int) ((TOP-BOTTOM)/BOX_Y)
 #define WIDTH (int) ((RIGHT-LEFT)/BOX_X)
 
-int box(int startx, int starty, int endx, int endy)
+struct calibration_
 {
-  int start = ((startx - LEFT) / WIDTH + (starty - BOTTOM) / HEIGHT * BOX_X);
-  if (start > BOX_X*BOX_Y)
+  int left;
+  int bottom;
+  int width;
+  int height;
+};
+
+static struct calibration_ calibration;
+
+struct point
+{
+  int x;
+  int y;
+};
+
+/* Tap(touchscreen): return a single tap to the touchscreen
+ *
+ * FIXME: This function has a lot of duplcation with the main loop,
+ * prehaps we should intergrate them.
+ */
+struct point tap(int touchscreen)
+{
+struct input_event ev;
+int z = 1;
+struct point xy;
+struct point ret;
+while(z != 0){
+  do {
+  read(touchscreen, &ev, sizeof(struct input_event));
+  if (ev.type == 3)
+    switch(ev.code)
+    {
+      case absX:
+        xy.x = ev.value;
+      break;
+      case absY:
+        xy.y = ev.value;
+      break;
+      case absZ: // Pen pressure
+        z = ev.value;
+    }
+  } while (ev.type != 0);
+  if( z == DOWN )
+  {
+    z = 1;
+    ret = xy;
+  }    
+}
+return ret;
+}
+
+void calibrate(int touchscreen)
+{
+  printf("To calibrate the digitizer, Please tap on the following places in order:\n");
+  printf("In the middle of 1,2,4,5\n");
+  struct point A = tap(touchscreen);
+  printf("In the middle of 7,8,?,0\n");
+  struct point B = tap(touchscreen);
+  printf("In the middle of O,R,E,S\n");
+  struct point C = tap(touchscreen);
+  calibration.height = (A.y - B.y) / 2;
+  calibration.width = (C.x - A.x) / 5;
+  calibration.left = A.x - calibration.width * 2;
+  calibration.bottom = B.y - calibration.height;
+  printf("Calibration done.");
+}
+
+int box(struct point start, struct point end)
+{
+  int startBox = ((start.x - calibration.left) / calibration.width  + (start.y -  calibration.bottom) / calibration.height  * BOX_X);
+  if (startBox > BOX_X*BOX_Y)
     return -1;
-  int end = ((endx - LEFT) / WIDTH + (endy - BOTTOM) / HEIGHT * BOX_X);
-  int ret = start*9;
-  switch( start-end )
+  int endBox = ((end.x - calibration.left) / calibration.width + (end.y - calibration.bottom) / calibration.height * BOX_X);
+  int ret = startBox*9;
+  switch( startBox-endBox )
   {
     case 1: //Mid left
       ret += 8;
@@ -79,12 +140,11 @@
 {
   struct input_event ev;
   struct input_event event;
-  int x = 0;
-  int y = 0;
+  struct point xy;
   int z = 0;
   int i;
-  int startx = 0;
-  int starty = 0;
+  struct point start;
+  pid_t pid = 0;
 
   //Seting up uinput
   struct uinput_user_dev uidev;
@@ -121,17 +181,22 @@
   if(touch == -1){
     printf("Error, Could not open touchscreen");
     return 1;}
-  do { // Main program loop
+  calibrate(touch);
+
+
+  pid = fork(); // fork into background
+  if( pid == 0 ) { // This is the background process
+  while (1) { // Main program loop
     do { // We loop through the events reading x, y and pressure values untill we get a blank event.
       read(touch, &ev, sizeof(struct input_event)); //Read from event interface
         if (ev.type == 3)
 	  switch(ev.code)
 	  {
 	    case absX:
-	      x = ev.value;
+	      xy.x = ev.value;
 	      break;
 	    case absY:
-	      y = ev.value;
+	      xy.y = ev.value;
 	      break;
 	    case absZ: // Pen pressure
 	      z = ev.value;
@@ -139,14 +204,13 @@
     } while (ev.type != 0);
     if(z == DOWN) // If the pen has just been put down, then we record the start x and y cordnates.
     {
-      startx = x;
-      starty = y;
+      start = xy;
       z = 1; // Clear z so we don't record startx and starty untill the pen goes down again
     }
     if(z == 0) // Pen up
     {
       z = 1; //clear z again
-      int code = box(startx, starty, x, y);
+      int code = box(start, xy);
       if (code != -1 && lookup[code] != 0)
       {
         event.type = EV_KEY; 	//indicates the keyboard event
@@ -157,6 +221,7 @@
 	write (uinput, &event, sizeof event);
       }
     }
-  } while(1);
-  return 1; //Right now we will never get here.
-;}
+  }
+  }
+  return 1;
+}


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