[8/10] gdiplus: use atan2 instead of atan
Evan Stade
estade at gmail.com
Wed Jul 18 21:40:05 CDT 2007
Hi,
changelog:
*use atan2 to make sure angle is in correct quadrant
dlls/gdiplus/graphics.c | 21 ++++++++++-----------
1 files changed, 10 insertions(+), 11 deletions(-)
--
Evan Stade
-------------- next part --------------
diff --git a/dlls/gdiplus/graphics.c b/dlls/gdiplus/graphics.c
index 6123b69..0720163 100644
--- a/dlls/gdiplus/graphics.c
+++ b/dlls/gdiplus/graphics.c
@@ -112,17 +112,16 @@ static void draw_cap(HDC hdc, COLORREF c
HBRUSH brush;
HPEN pen;
POINT pt[4];
- REAL theta, dsmall, dbig, dx, dy, invert;
+ REAL theta, dsmall, dbig, dx, dy;
if(x2 != x1)
- theta = atan((y2 - y1) / (x2 - x1));
+ theta = atan2(y2 - y1, x2 - x1);
else if(y2 != y1){
theta = M_PI_2 * (y2 > y1 ? 1.0 : -1.0);
}
else
return;
- invert = ((x2 - x1) >= 0.0 ? 1.0 : -1.0);
brush = CreateSolidBrush(color);
pen = CreatePen(PS_SOLID, 1, color);
oldbrush = SelectObject(hdc, brush);
@@ -164,14 +163,14 @@ static void draw_cap(HDC hdc, COLORREF c
case LineCapArrowAnchor:
size = size * 4.0 / sqrt(3.0);
- dx = cos(M_PI / 6.0 + theta) * size * invert;
- dy = sin(M_PI / 6.0 + theta) * size * invert;
+ dx = cos(M_PI / 6.0 + theta) * size;
+ dy = sin(M_PI / 6.0 + theta) * size;
pt[0].x = roundr(x2 - dx);
pt[0].y = roundr(y2 - dy);
- dx = cos(- M_PI / 6.0 + theta) * size * invert;
- dy = sin(- M_PI / 6.0 + theta) * size * invert;
+ dx = cos(- M_PI / 6.0 + theta) * size;
+ dy = sin(- M_PI / 6.0 + theta) * size;
pt[1].x = roundr(x2 - dx);
pt[1].y = roundr(y2 - dy);
@@ -203,8 +202,8 @@ static void draw_cap(HDC hdc, COLORREF c
pt[1].x = roundr(pt[0].x + 2.0 * dx);
pt[1].y = roundr(pt[0].y + 2.0 * dy);
- dx = cos(theta) * size * invert;
- dy = sin(theta) * size * invert;
+ dx = cos(theta) * size;
+ dy = sin(theta) * size;
pt[2].x = roundr(x2 + dx);
pt[2].y = roundr(y2 + dy);
@@ -213,8 +212,8 @@ static void draw_cap(HDC hdc, COLORREF c
break;
case LineCapRound:
- dx = -cos(M_PI_2 + theta) * size * invert;
- dy = -sin(M_PI_2 + theta) * size * invert;
+ dx = -cos(M_PI_2 + theta) * size;
+ dy = -sin(M_PI_2 + theta) * size;
pt[0].x = ((x2 - x1) >= 0 ? floorf(x2 - dx) : ceilf(x2 - dx));
pt[0].y = ((y2 - y1) >= 0 ? floorf(y2 - dy) : ceilf(y2 - dy));
--
1.4.1
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