static void drawLines(JNIEnv* env, jobject jcanvas, jfloatArray jptsArray,
jint offset, jint count, jobject jpaint) {
doPoints(env, jcanvas, jptsArray, offset, count, jpaint,
SkCanvas::kLines_PointMode);
}
int main(int argc, char **argv) {
int serialFd;
int outFd;
GR_SCREEN_INFO info;
GR_WINDOW_ID calWindow;
GR_EVENT event;
/* Open up the graphics */
if (GrOpen() == -1) {
fprintf(stderr, "Error! Unable to open the graphics engine\n");
return(-1);
}
/* Now open the serial port */
serialFd = calInitSerial("/dev/ttyS1");
if (serialFd == -1) {
fprintf(stderr, "Error! Unable to open the touchscreen device\n");
return(-1);
}
GrGetScreenInfo(&info);
/* Decide which points we are going to touch */
dataPoints[0].scrX = 10;
dataPoints[0].scrY = 10;
dataPoints[1].scrX = 10;
dataPoints[1].scrY = info.rows - 10;
dataPoints[2].scrX = info.cols - 10;
dataPoints[2].scrY = info.rows - 10;
dataPoints[3].scrX = info.cols - 10;
dataPoints[3].scrY = 10;
/* Now, create a window that spans the entire size of the screen */
calWindow = GrNewWindow(GR_ROOT_WINDOW_ID, 0, 0, info.cols, info.rows, 0, BGCOLOR, FGCOLOR);
GrSelectEvents(calWindow, GR_EVENT_MASK_EXPOSURE);
GrMapWindow(calWindow);
/* Wait for exposure */
while(GrPeekEvent(&event) != GR_EVENT_TYPE_EXPOSURE);
/* Ok, now that we have been exposed, draw the instructions */
drawText(calWindow, instructions, 4);
if (!doPoints(calWindow, serialFd)) {
double scrXDelta, rawXDelta;
double scrYDelta, rawYDelta;
double deltaX, deltaY;
scrXDelta = (double) dataPoints[2].scrX - dataPoints[0].scrX;
rawXDelta = (double) dataPoints[2].rawX - dataPoints[0].rawX;
scrYDelta = (double) dataPoints[1].scrY - dataPoints[0].scrY;
rawYDelta = (double) dataPoints[1].rawY - dataPoints[0].rawY;
/* We can now extrapolate and discover the extreme edges of the screen */
/* First, the low values */
deltaX = abs( (rawXDelta / scrXDelta) * ((double) dataPoints[0].scrX));
deltaY = abs( (rawYDelta / scrYDelta) * ((double) dataPoints[0].scrY));
/*
deltaX = abs((double) dataPoints[0].scrX * rawXDelta) / scrXDelta);
deltaY = abs((double) (dataPoints[0].scrY * rawYDelta) / scrYDelta);
*/
/* Print out the raw values, accounting for possible inversion */
if (dataPoints[0].rawX > dataPoints[2].rawX) {
printf("%d ", (int) (dataPoints[0].rawX + deltaX));
printf("%d ", (int) (dataPoints[2].rawX - deltaX));
}
else {
printf("%d ", (int) (dataPoints[0].rawX - deltaX));
printf("%d ", (int) (dataPoints[2].rawX + deltaX));
}
if (dataPoints[0].rawY >dataPoints[1].rawY) {
printf("%d ", (int) (dataPoints[0].rawY + deltaY));
printf("%d\n", (int) (dataPoints[1].rawY - deltaY));
}
else {
printf("%d ", (int) (dataPoints[0].rawY - deltaY));
printf("%d\n", (int) (dataPoints[1].rawY + deltaY));
}
}
else {
fprintf(stderr, "Error - Unable to read the touchscreen\n");
}
/* Close everything down */
calCloseSerial(serialFd);
GrClose();
/* Byebye! */
return(0);
}
