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Diffstat (limited to 'src/libui_sdl/libui/windows/drawpath.cpp')
| -rw-r--r-- | src/libui_sdl/libui/windows/drawpath.cpp | 246 |
1 files changed, 0 insertions, 246 deletions
diff --git a/src/libui_sdl/libui/windows/drawpath.cpp b/src/libui_sdl/libui/windows/drawpath.cpp deleted file mode 100644 index 49855be..0000000 --- a/src/libui_sdl/libui/windows/drawpath.cpp +++ /dev/null @@ -1,246 +0,0 @@ -// 7 september 2015 -#include "uipriv_windows.hpp" -#include "draw.hpp" - -// TODO -// - write a test for transform followed by clip and clip followed by transform to make sure they work the same as on gtk+ and cocoa -// - write a test for nested transforms for gtk+ - -struct uiDrawPath { - ID2D1PathGeometry *path; - ID2D1GeometrySink *sink; - BOOL inFigure; -}; - -uiDrawPath *uiDrawNewPath(uiDrawFillMode fillmode) -{ - uiDrawPath *p; - HRESULT hr; - - p = uiNew(uiDrawPath); - hr = d2dfactory->CreatePathGeometry(&(p->path)); - if (hr != S_OK) - logHRESULT(L"error creating path", hr); - hr = p->path->Open(&(p->sink)); - if (hr != S_OK) - logHRESULT(L"error opening path", hr); - switch (fillmode) { - case uiDrawFillModeWinding: - p->sink->SetFillMode(D2D1_FILL_MODE_WINDING); - break; - case uiDrawFillModeAlternate: - p->sink->SetFillMode(D2D1_FILL_MODE_ALTERNATE); - break; - } - return p; -} - -void uiDrawFreePath(uiDrawPath *p) -{ - if (p->inFigure) - p->sink->EndFigure(D2D1_FIGURE_END_OPEN); - if (p->sink != NULL) - // TODO close sink first? - p->sink->Release(); - p->path->Release(); - uiFree(p); -} - -void uiDrawPathNewFigure(uiDrawPath *p, double x, double y) -{ - D2D1_POINT_2F pt; - - if (p->inFigure) - p->sink->EndFigure(D2D1_FIGURE_END_OPEN); - pt.x = x; - pt.y = y; - p->sink->BeginFigure(pt, D2D1_FIGURE_BEGIN_FILLED); - p->inFigure = TRUE; -} - -// Direct2D arcs require a little explanation. -// An arc in Direct2D is defined by the chord between the endpoints. -// There are four possible arcs with the same two endpoints that you can draw this way. -// See https://www.youtube.com/watch?v=ATS0ANW1UxQ for a demonstration. -// There is a property rotationAngle which deals with the rotation /of the entire ellipse that forms an ellpitical arc/ - it's effectively a transformation on the arc. -// That is to say, it's NOT THE SWEEP. -// The sweep is defined by the start and end points and whether the arc is "large". -// As a result, this design does not allow for full circles or ellipses with a single arc; they have to be simulated with two. - -struct arc { - double xCenter; - double yCenter; - double radius; - double startAngle; - double sweep; - int negative; -}; - -// this is used for the comparison below -// if it falls apart it can be changed later -#define aerMax 6 * DBL_EPSILON - -static void drawArc(uiDrawPath *p, struct arc *a, void (*startFunction)(uiDrawPath *, double, double)) -{ - double sinx, cosx; - double startX, startY; - double endX, endY; - D2D1_ARC_SEGMENT as; - BOOL fullCircle; - double absSweep; - - // as above, we can't do a full circle with one arc - // simulate it with two half-circles - // of course, we have a dragon: equality on floating-point values! - // I've chosen to do the AlmostEqualRelative() technique in https://randomascii.wordpress.com/2012/02/25/comparing-floating-point-numbers-2012-edition/ - fullCircle = FALSE; - // use the absolute value to tackle both ≥2π and ≤-2π at the same time - absSweep = fabs(a->sweep); - if (absSweep > (2 * uiPi)) // this part is easy - fullCircle = TRUE; - else { - double aerDiff; - - aerDiff = fabs(absSweep - (2 * uiPi)); - // if we got here then we know a->sweep is larger (or the same!) - fullCircle = aerDiff <= absSweep * aerMax; - } - // TODO make sure this works right for the negative direction - if (fullCircle) { - a->sweep = uiPi; - drawArc(p, a, startFunction); - a->startAngle += uiPi; - drawArc(p, a, NULL); - return; - } - - // first, figure out the arc's endpoints - // unfortunately D2D1SinCos() is only defined on Windows 8 and newer - // the MSDN page doesn't say this, but says it requires d2d1_1.h, which is listed as only supported on Windows 8 and newer elsewhere on MSDN - // so we must use sin() and cos() and hope it's right... - sinx = sin(a->startAngle); - cosx = cos(a->startAngle); - startX = a->xCenter + a->radius * cosx; - startY = a->yCenter + a->radius * sinx; - sinx = sin(a->startAngle + a->sweep); - cosx = cos(a->startAngle + a->sweep); - endX = a->xCenter + a->radius * cosx; - endY = a->yCenter + a->radius * sinx; - - // now do the initial step to get the current point to be the start point - // this is either creating a new figure, drawing a line, or (in the case of our full circle code above) doing nothing - if (startFunction != NULL) - (*startFunction)(p, startX, startY); - - // now we can draw the arc - as.point.x = endX; - as.point.y = endY; - as.size.width = a->radius; - as.size.height = a->radius; - as.rotationAngle = 0; // as above, not relevant for circles - if (a->negative) - as.sweepDirection = D2D1_SWEEP_DIRECTION_COUNTER_CLOCKWISE; - else - as.sweepDirection = D2D1_SWEEP_DIRECTION_CLOCKWISE; - // TODO explain the outer if - if (!a->negative) - if (a->sweep > uiPi) - as.arcSize = D2D1_ARC_SIZE_LARGE; - else - as.arcSize = D2D1_ARC_SIZE_SMALL; - else - // TODO especially this part - if (a->sweep > uiPi) - as.arcSize = D2D1_ARC_SIZE_SMALL; - else - as.arcSize = D2D1_ARC_SIZE_LARGE; - p->sink->AddArc(&as); -} - -void uiDrawPathNewFigureWithArc(uiDrawPath *p, double xCenter, double yCenter, double radius, double startAngle, double sweep, int negative) -{ - struct arc a; - - a.xCenter = xCenter; - a.yCenter = yCenter; - a.radius = radius; - a.startAngle = startAngle; - a.sweep = sweep; - a.negative = negative; - drawArc(p, &a, uiDrawPathNewFigure); -} - -void uiDrawPathLineTo(uiDrawPath *p, double x, double y) -{ - D2D1_POINT_2F pt; - - pt.x = x; - pt.y = y; - p->sink->AddLine(pt); -} - -void uiDrawPathArcTo(uiDrawPath *p, double xCenter, double yCenter, double radius, double startAngle, double sweep, int negative) -{ - struct arc a; - - a.xCenter = xCenter; - a.yCenter = yCenter; - a.radius = radius; - a.startAngle = startAngle; - a.sweep = sweep; - a.negative = negative; - drawArc(p, &a, uiDrawPathLineTo); -} - -void uiDrawPathBezierTo(uiDrawPath *p, double c1x, double c1y, double c2x, double c2y, double endX, double endY) -{ - D2D1_BEZIER_SEGMENT s; - - s.point1.x = c1x; - s.point1.y = c1y; - s.point2.x = c2x; - s.point2.y = c2y; - s.point3.x = endX; - s.point3.y = endY; - p->sink->AddBezier(&s); -} - -void uiDrawPathCloseFigure(uiDrawPath *p) -{ - p->sink->EndFigure(D2D1_FIGURE_END_CLOSED); - p->inFigure = FALSE; -} - -void uiDrawPathAddRectangle(uiDrawPath *p, double x, double y, double width, double height) -{ - // this is the same algorithm used by cairo and Core Graphics, according to their documentations - uiDrawPathNewFigure(p, x, y); - uiDrawPathLineTo(p, x + width, y); - uiDrawPathLineTo(p, x + width, y + height); - uiDrawPathLineTo(p, x, y + height); - uiDrawPathCloseFigure(p); -} - -void uiDrawPathEnd(uiDrawPath *p) -{ - HRESULT hr; - - if (p->inFigure) { - p->sink->EndFigure(D2D1_FIGURE_END_OPEN); - // needed for uiDrawFreePath() - p->inFigure = FALSE; - } - hr = p->sink->Close(); - if (hr != S_OK) - logHRESULT(L"error closing path", hr); - p->sink->Release(); - // also needed for uiDrawFreePath() - p->sink = NULL; -} - -ID2D1PathGeometry *pathGeometry(uiDrawPath *p) -{ - if (p->sink != NULL) - userbug("You cannot draw with a uiDrawPath that was not ended. (path: %p)", p); - return p->path; -} |