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gdi32: Fix ArcTo to use proper starting and ending points.

This commit is contained in:
Misha Koshelev 2007-06-19 01:44:26 -05:00 committed by Alexandre Julliard
parent 2c9c761b56
commit 1dbe178f5e
2 changed files with 36 additions and 20 deletions
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52
dlls/gdi32/painting.c
View File

@ -118,28 +118,44 @@ BOOL WINAPI ArcTo( HDC hdc,
if(!dc) return FALSE;
if(dc->funcs->pArcTo)
{
result = dc->funcs->pArcTo( dc->physDev, left, top, right, bottom,
xstart, ystart, xend, yend );
GDI_ReleaseObj( hdc );
return result;
else
{
double width = fabs(right-left),
height = fabs(bottom-top),
xradius = width/2,
yradius = height/2,
xcenter = right > left ? left+xradius : right+xradius,
ycenter = bottom > top ? top+yradius : bottom+yradius;
/*
* Else emulate it.
* According to the documentation, a line is drawn from the current
* position to the starting point of the arc.
*/
double angle = atan2(
((ystart-ycenter)/height),
((xstart-xcenter)/width));
LineTo(hdc, GDI_ROUND(xcenter+(cos(angle)*xradius)),
GDI_ROUND(ycenter+(sin(angle)*yradius)));
/*
* Then the arc is drawn.
*/
result = Arc(hdc, left, top, right, bottom, xstart, ystart, xend, yend);
/*
* If no error occurred, the current position is moved to the ending
* point of the arc.
*/
if (result)
{
angle = atan2(
((yend-ycenter)/height),
((xend-xcenter)/width));
MoveToEx(hdc, GDI_ROUND(xcenter+(cos(angle)*xradius)),
GDI_ROUND(ycenter+(sin(angle)*yradius)), NULL);
}
}
GDI_ReleaseObj( hdc );
/*
* Else emulate it.
* According to the documentation, a line is drawn from the current
* position to the starting point of the arc.
*/
LineTo(hdc, xstart, ystart);
/*
* Then the arc is drawn.
*/
result = Arc(hdc, left, top, right, bottom, xstart, ystart, xend, yend);
/*
* If no error occurred, the current position is moved to the ending
* point of the arc.
*/
if (result) MoveToEx(hdc, xend, yend, NULL);
return result;
}

4
dlls/gdi32/tests/path.c
View File

@ -193,7 +193,7 @@ static void ok_path(HDC hdc, const path_test_t *expected, int expected_size, BOO
static const path_test_t arcto_path[] = {
{0, 0, PT_MOVETO, 0, 0}, /* 0 */
{229, 215, PT_LINETO, 0, 1}, /* 1 */
{229, 215, PT_LINETO, 0, 0}, /* 1 */
{248, 205, PT_BEZIERTO, 1, 0}, /* 2 */
{273, 200, PT_BEZIERTO, 0, 0}, /* 3 */
{300, 200, PT_BEZIERTO, 0, 0}, /* 4 */
@ -203,7 +203,7 @@ static const path_test_t arcto_path[] = {
{399, 263, PT_BEZIERTO, 0, 0}, /* 8 */
{389, 275, PT_BEZIERTO, 0, 0}, /* 9 */
{370, 285, PT_BEZIERTO, 0, 0}, /* 10 */
{363, 277, PT_LINETO, 1, 1}, /* 11 */
{363, 277, PT_LINETO, 1, 0}, /* 11 */
{380, 270, PT_BEZIERTO, 1, 0}, /* 12 */
{389, 260, PT_BEZIERTO, 0, 0}, /* 13 */
{389, 250, PT_BEZIERTO, 0, 0}, /* 14 */