Hi,
I would like to be able to create a bitmap dynamically - in some
cases it will be a bitmap on a form, in other cases it will be a
bitmap to be used in a graphic button. For now, I'm just trying to
get the form bitmap to work.
I am creating the bitmap, using Win draw functions to draw the
bitmap, then storing it in my own resource database, and attempting a
FrmNewBitmap. Unfortunately, nothing is showing up. I was hoping
that someone might tell me where I'm going astray.
Ugly code below... I know this is not how you would normally do this.
(It is just a test for now.) Also, there is a FrmDrawForm call
following this function.
static const UInt32 kDBType = 'data';
DmOpenRef bm_dbR; // reference to bitmap database
void DynWidgetTest ()
{
BitmapType *bmpP;
FormPtr frmP;
WinHandle win;
Err error;
MemHandle bmH; // handle to bitmap
RectangleType onScreenRect;
// making a simple b&w (depth=1) bitmap
bmpP = BmpCreate(10, 10, 1, NULL, &error);
if (bmpP) {
win = WinCreateBitmapWindow(bmpP, &error);
if (win) {
WinSetDrawWindow(win);
WinDrawPixel (1,1);
WinDrawPixel (2,2);
WinDrawPixel (3,3);
WinDrawPixel (4,4);
WinDrawPixel (4,6);
WinDrawPixel (3,7);
WinDrawPixel (2,8);
WinDrawPixel (1,9);
// is this proper use of WinSetBounds? is this nec?
onScreenRect.topLeft.x = 0;
onScreenRect.topLeft.y = 0;
onScreenRect.extent.x = 9;
onScreenRect.extent.y = 9;
WinSetBounds(win, &onScreenRect);
// for now... create a resource db
error = DmCreateDatabase (0, "PB",
MY_FILE_CREATOR, kDBType, true);
if (!error) {
// now open the db
bm_dbR = DmOpenDatabaseByTypeCreator (kDBType,
MY_FILE_CREATOR,
dmModeReadWrite);
// did it open?
if (bm_dbR) {
// now store the bitmap in the resource db
bmH = DmNewResource (bm_dbR, 'Tbmp', 3333, BmpSize(bmpP));
if (bmH) {
// draw it on the current form
frmP = FrmGetActiveForm();
// Not so sure about these parameters ... esp. the first 3333
FrmNewBitmap(&frmP, 3333, 3333, 50, 100);
}
... more below ... releasing resources .. closing db...and displaying
form
I'm really uncertain about the FrmNewBitmap call. I don't know if the
first index parameter is correct - or what it should be. I'm also uneasy
with the WinSetBounds. Is there another (and better) way to do this?
Thanks for any help,
Ellen
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