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moved splines rendering code into wxDCBase

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@9524 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Václav Slavík
2001-03-13 23:38:57 +00:00
parent 99b02ec0d8
commit fe2e43661e
15 changed files with 168 additions and 1338 deletions
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236
src/os2/dc.cpp
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@@ -1369,239 +1369,3 @@ void wxDC::DoGetTextExtent(const wxString& string, float *x, float *y,
}
#endif
// ---------------------------------------------------------------------------
// spline drawing code
// ---------------------------------------------------------------------------
#if wxUSE_SPLINES
class wxSpline: public wxObject
{
public:
int type;
wxList *points;
wxSpline(wxList *list);
void DeletePoints();
// Doesn't delete points
~wxSpline();
};
void wx_draw_open_spline(wxDC *dc, wxSpline *spline);
void wx_quadratic_spline(double a1, double b1, double a2, double b2,
double a3, double b3, double a4, double b4);
void wx_clear_stack();
int wx_spline_pop(double *x1, double *y1, double *x2, double *y2, double *x3,
double *y3, double *x4, double *y4);
void wx_spline_push(double x1, double y1, double x2, double y2, double x3, double y3,
double x4, double y4);
static bool wx_spline_add_point(double x, double y);
static void wx_spline_draw_point_array(wxDC *dc);
wxSpline *wx_make_spline(int x1, int y1, int x2, int y2, int x3, int y3);
void wxDC::DoDrawSpline(wxList *list)
{
wxSpline spline(list);
wx_draw_open_spline(this, &spline);
}
wxList wx_spline_point_list;
void wx_draw_open_spline(wxDC *dc, wxSpline *spline)
{
wxPoint *p;
double cx1, cy1, cx2, cy2, cx3, cy3, cx4, cy4;
double x1, y1, x2, y2;
wxNode *node = spline->points->First();
p = (wxPoint *)node->Data();
x1 = p->x;
y1 = p->y;
node = node->Next();
p = (wxPoint *)node->Data();
x2 = p->x;
y2 = p->y;
cx1 = (double)((x1 + x2) / 2);
cy1 = (double)((y1 + y2) / 2);
cx2 = (double)((cx1 + x2) / 2);
cy2 = (double)((cy1 + y2) / 2);
wx_spline_add_point(x1, y1);
while ((node = node->Next()) != NULL)
{
p = (wxPoint *)node->Data();
x1 = x2;
y1 = y2;
x2 = p->x;
y2 = p->y;
cx4 = (double)(x1 + x2) / 2;
cy4 = (double)(y1 + y2) / 2;
cx3 = (double)(x1 + cx4) / 2;
cy3 = (double)(y1 + cy4) / 2;
wx_quadratic_spline(cx1, cy1, cx2, cy2, cx3, cy3, cx4, cy4);
cx1 = cx4;
cy1 = cy4;
cx2 = (double)(cx1 + x2) / 2;
cy2 = (double)(cy1 + y2) / 2;
}
wx_spline_add_point((double)wx_round(cx1), (double)wx_round(cy1));
wx_spline_add_point(x2, y2);
wx_spline_draw_point_array(dc);
}
/********************* CURVES FOR SPLINES *****************************
The following spline drawing routine is from
"An Algorithm for High-Speed Curve Generation"
by George Merrill Chaikin,
Computer Graphics and Image Processing, 3, Academic Press,
1974, 346-349.
and
"On Chaikin's Algorithm" by R. F. Riesenfeld,
Computer Graphics and Image Processing, 4, Academic Press,
1975, 304-310.
***********************************************************************/
#define half(z1, z2) ((z1+z2)/2.0)
#define THRESHOLD 5
/* iterative version */
void wx_quadratic_spline(double a1, double b1, double a2, double b2, double a3, double b3, double a4,
double b4)
{
register double xmid, ymid;
double x1, y1, x2, y2, x3, y3, x4, y4;
wx_clear_stack();
wx_spline_push(a1, b1, a2, b2, a3, b3, a4, b4);
while (wx_spline_pop(&x1, &y1, &x2, &y2, &x3, &y3, &x4, &y4)) {
xmid = (double)half(x2, x3);
ymid = (double)half(y2, y3);
if (fabs(x1 - xmid) < THRESHOLD && fabs(y1 - ymid) < THRESHOLD &&
fabs(xmid - x4) < THRESHOLD && fabs(ymid - y4) < THRESHOLD) {
wx_spline_add_point((double)wx_round(x1), (double)wx_round(y1));
wx_spline_add_point((double)wx_round(xmid), (double)wx_round(ymid));
} else {
wx_spline_push(xmid, ymid, (double)half(xmid, x3), (double)half(ymid, y3),
(double)half(x3, x4), (double)half(y3, y4), x4, y4);
wx_spline_push(x1, y1, (double)half(x1, x2), (double)half(y1, y2),
(double)half(x2, xmid), (double)half(y2, ymid), xmid, ymid);
}
}
}
/* utilities used by spline drawing routines */
typedef struct wx_spline_stack_struct {
double x1, y1, x2, y2, x3, y3, x4, y4;
}
Stack;
#define SPLINE_STACK_DEPTH 20
static Stack wx_spline_stack[SPLINE_STACK_DEPTH];
static Stack *wx_stack_top;
static int wx_stack_count;
void wx_clear_stack()
{
wx_stack_top = wx_spline_stack;
wx_stack_count = 0;
}
void wx_spline_push(double x1, double y1, double x2, double y2, double x3, double y3, double x4, double y4)
{
wx_stack_top->x1 = x1;
wx_stack_top->y1 = y1;
wx_stack_top->x2 = x2;
wx_stack_top->y2 = y2;
wx_stack_top->x3 = x3;
wx_stack_top->y3 = y3;
wx_stack_top->x4 = x4;
wx_stack_top->y4 = y4;
wx_stack_top++;
wx_stack_count++;
}
int wx_spline_pop(double *x1, double *y1, double *x2, double *y2,
double *x3, double *y3, double *x4, double *y4)
{
if (wx_stack_count == 0)
return (0);
wx_stack_top--;
wx_stack_count--;
*x1 = wx_stack_top->x1;
*y1 = wx_stack_top->y1;
*x2 = wx_stack_top->x2;
*y2 = wx_stack_top->y2;
*x3 = wx_stack_top->x3;
*y3 = wx_stack_top->y3;
*x4 = wx_stack_top->x4;
*y4 = wx_stack_top->y4;
return (1);
}
static bool wx_spline_add_point(double x, double y)
{
wxPoint *point = new wxPoint;
point->x = (int) x;
point->y = (int) y;
wx_spline_point_list.Append((wxObject*)point);
return TRUE;
}
static void wx_spline_draw_point_array(wxDC *dc)
{
dc->DrawLines(&wx_spline_point_list, 0, 0);
wxNode *node = wx_spline_point_list.First();
while (node)
{
wxPoint *point = (wxPoint *)node->Data();
delete point;
delete node;
node = wx_spline_point_list.First();
}
}
wxSpline::wxSpline(wxList *list)
{
points = list;
}
wxSpline::~wxSpline()
{
}
void wxSpline::DeletePoints()
{
for(wxNode *node = points->First(); node; node = points->First())
{
wxPoint *point = (wxPoint *)node->Data();
delete point;
delete node;
}
delete points;
}
#endif // wxUSE_SPLINES