Dear GRX

I have experienced trouble using GrMouseWarp under Win32(MinGW). Using it seems to position the cursor in the wrong place. Also, GrMouseErase does not seem to remove the cursor. I enclose a sample program. This draws a white cross at the centre. I then try and position the mouse cursor over it using GrMouseWarp. This seems to give the wrong position. Hiding it with GrMouseErase does not seem to work.

I would be grateful of any advice.

/* Program draws a white cross in the centre of the screen */ /* It then attempts to position the mouse at his point. */ /* Using GrMouseWarp(oX,oY) it attempts to match this point */ /* GrMouseEraseCursor() attempts to hide the mouse cursor */ /* Under Win32(MinGW) (W2000 & XP) it fails in these last two tasks */ /* Program is halted by a key press */

#include <stdio.h> #include <grx20.h>

int main() { GrMouseEvent event; /*Mouse event */ int x,y,buttons; /* Mouse position & buttons */ int xMax,yMax,oX,oY; /* Size of screen & centre */ GrGraphicsMode gM; GrVideoAdapter gV;

GrSetMode(GR_default_graphics);

GrMouseInit(); /* In this order */ xMax = GrSizeX(); yMax = GrSizeY(); oX = xMax/2; oY = yMax/2; GrMouseWarp(oX,oY); GrMouseEraseCursor();

printf("xMax = %d yMax = %d\n",xMax,yMax); printf("oX = %d oY = %d\n",oX,oY);

gM = GrCurrentMode(); printf("Graphics mode = %d\n",gM);

gV = GrAdapterType(); printf("Video adapter = %d\n",gV);

while(1) { GrMouseGetEvent(GR_M_MOTION,&event); GrLine(oX-4,oY,oX+4,oY,GrWhite()); GrLine(oX,oY-4,oX,oY+4,GrWhite()); if(GrKeyPressed()) break; } GrMouseUnInit();

return 0; }