Hello all,
I'm new to plplot. While playing with examples I have found that x01
behaves strangely, in particular the "-locate" switch.
After reading some code, I've found that xcairo_get_cursor() in
drivers/cairo.c calls some X API to get a mouse event. But X uses a
coordinate system where origin is located in top-left corner and Y
axis goes down, while plplot uses a coordinate system with Y axis
going up.
Thus, plGetCursor() call works incorrectly, that is, it returns wrong
world coordinates, Y axis is inverted.
I have reduced x01 to a small testcase. Try clicking on the plot --
you'll get "plGetCursor() == 0". Try clicking on the black area
below, you'll get some coordinates.
I've verified that the bug exists in the latest trunk.
Regards,
Dmitri Gribenko
--
main(i,j){for(i=2;;i++){for(j=2;j<i;j++){if(!(i%j)){j=0;break;}}if
(j){printf("%d\n",i);}}} /*Dmitri Gribenko <griboz...@gmail.com>*/
#include <math.h>
#include <string.h>
#include <ctype.h>
#include <plplot.h>
#include <plevent.h>
int main(int argc, const char *argv[])
{
/* Parse and process command line arguments */
plparseopts(&argc, argv, PL_PARSE_FULL);
/* Initialize plplot */
plsdev("xcairo");
plssub(1, 2);
plinit();
/* Draw the box and grid */
plenv(0.0, 15.0, 0, 1.0, 0, 2);
/* Let's get some user input */
PLGraphicsIn gin;
for (;;) {
if (! plGetCursor(&gin))
{
printf("plGetCursor() == 0\n");
continue;
}
if (gin.keysym == PLK_Escape)
break;
pltext();
if (gin.keysym < 0xFF && isprint(gin.keysym))
printf("subwin = %d, wx = %f, wy = %f, dx = %f, dy = %f, c = '%c'\n",
gin.subwindow, gin.wX, gin.wY, gin.dX, gin.dY, gin.keysym);
else
printf("subwin = %d, wx = %f, wy = %f, dx = %f, dy = %f, c = 0x%02x\n",
gin.subwindow, gin.wX, gin.wY, gin.dX, gin.dY, gin.keysym);
plgra();
}
plend();
exit(0);
}
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