OK, I have two versions of my code. The first appears to work (mostly) and the 2nd gives me the Uncaught Error in the topic name.
var VID_WID = 640;
var VID_HIGH = 360;
var OUT_WID = 480;
var OUT_HIGH = 320;
var NUM_WID = 3;
var NUM_HIGH = 3;
var TILE_WIDTH = VID_WID / NUM_WID;
var TILE_HEIGHT = VID_HIGH / NUM_HIGH;
var OUT_WIDTH = OUT_WID / NUM_WID;
var OUT_HEIGHT = OUT_HIGH / NUM_HIGH;
tile.sx = x*TILE_WIDTH;
tile.sy = y*TILE_HEIGHT;
tile.dx = x*OUT_WIDTH;
tile.dy = y*OUT_HEIGHT;
draw.drawImage(copycanvas, tile.sx, tile.sy,
tile.sx = x;
tile.sy = y;
tile.dx = x;
tile.dy = y;
draw.drawImage(copycanvas, tile.sx*TILE_WIDTH, tile.sy*TILE_HEIGHT,
The ONLY difference I see is WHERE I am doing the multiply by the WIDTH and HEIGHT parameters. Yet one works and the other gives the exception.
I WANT to use the latter code so I can compoare the x and y values of the .sx and .dx directly against x, instead of sx/TILE_WIDTH == dx/OUT_WIDTH. I guess I can always add yet another couple of fields to duplicate the effort, but it seems that I should NOT have to do that.
Any idea why one works and the other doesn't?