200 lines
3.7 KiB
C
200 lines
3.7 KiB
C
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// 6 september 2015
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#include "uipriv_unix.h"
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#include "draw.h"
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struct uiDrawPath {
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GArray *pieces;
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uiDrawFillMode fillMode;
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gboolean ended;
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};
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struct piece {
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int type;
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double d[8];
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int b;
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};
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enum {
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newFigure,
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newFigureArc,
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lineTo,
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arcTo,
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bezierTo,
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closeFigure,
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addRect,
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};
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uiDrawPath *uiDrawNewPath(uiDrawFillMode mode)
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{
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uiDrawPath *p;
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p = uiprivNew(uiDrawPath);
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p->pieces = g_array_new(FALSE, TRUE, sizeof (struct piece));
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p->fillMode = mode;
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return p;
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}
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void uiDrawFreePath(uiDrawPath *p)
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{
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g_array_free(p->pieces, TRUE);
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uiprivFree(p);
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}
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static void add(uiDrawPath *p, struct piece *piece)
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{
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if (p->ended)
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uiprivUserBug("You cannot modify a uiDrawPath that has been ended. (path: %p)", p);
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g_array_append_vals(p->pieces, piece, 1);
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}
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void uiDrawPathNewFigure(uiDrawPath *p, double x, double y)
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{
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struct piece piece;
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piece.type = newFigure;
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piece.d[0] = x;
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piece.d[1] = y;
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add(p, &piece);
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}
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void uiDrawPathNewFigureWithArc(uiDrawPath *p, double xCenter, double yCenter, double radius, double startAngle, double sweep, int negative)
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{
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struct piece piece;
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if (sweep > 2 * uiPi)
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sweep = 2 * uiPi;
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piece.type = newFigureArc;
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piece.d[0] = xCenter;
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piece.d[1] = yCenter;
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piece.d[2] = radius;
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piece.d[3] = startAngle;
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piece.d[4] = sweep;
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piece.b = negative;
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add(p, &piece);
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}
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void uiDrawPathLineTo(uiDrawPath *p, double x, double y)
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{
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struct piece piece;
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piece.type = lineTo;
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piece.d[0] = x;
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piece.d[1] = y;
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add(p, &piece);
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}
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void uiDrawPathArcTo(uiDrawPath *p, double xCenter, double yCenter, double radius, double startAngle, double sweep, int negative)
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{
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struct piece piece;
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if (sweep > 2 * uiPi)
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sweep = 2 * uiPi;
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piece.type = arcTo;
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piece.d[0] = xCenter;
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piece.d[1] = yCenter;
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piece.d[2] = radius;
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piece.d[3] = startAngle;
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piece.d[4] = sweep;
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piece.b = negative;
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add(p, &piece);
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}
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void uiDrawPathBezierTo(uiDrawPath *p, double c1x, double c1y, double c2x, double c2y, double endX, double endY)
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{
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struct piece piece;
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piece.type = bezierTo;
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piece.d[0] = c1x;
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piece.d[1] = c1y;
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piece.d[2] = c2x;
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piece.d[3] = c2y;
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piece.d[4] = endX;
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piece.d[5] = endY;
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add(p, &piece);
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}
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void uiDrawPathCloseFigure(uiDrawPath *p)
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{
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struct piece piece;
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piece.type = closeFigure;
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add(p, &piece);
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}
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void uiDrawPathAddRectangle(uiDrawPath *p, double x, double y, double width, double height)
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{
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struct piece piece;
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piece.type = addRect;
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piece.d[0] = x;
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piece.d[1] = y;
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piece.d[2] = width;
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piece.d[3] = height;
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add(p, &piece);
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}
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void uiDrawPathEnd(uiDrawPath *p)
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{
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p->ended = TRUE;
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}
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void uiprivRunPath(uiDrawPath *p, cairo_t *cr)
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{
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guint i;
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struct piece *piece;
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void (*arc)(cairo_t *, double, double, double, double, double);
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if (!p->ended)
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uiprivUserBug("You cannot draw with a uiDrawPath that has not been ended. (path: %p)", p);
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cairo_new_path(cr);
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for (i = 0; i < p->pieces->len; i++) {
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piece = &g_array_index(p->pieces, struct piece, i);
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switch (piece->type) {
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case newFigure:
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cairo_move_to(cr, piece->d[0], piece->d[1]);
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break;
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case newFigureArc:
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cairo_new_sub_path(cr);
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// fall through
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case arcTo:
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arc = cairo_arc;
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if (piece->b)
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arc = cairo_arc_negative;
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(*arc)(cr,
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piece->d[0],
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piece->d[1],
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piece->d[2],
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piece->d[3],
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piece->d[3] + piece->d[4]);
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break;
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case lineTo:
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cairo_line_to(cr, piece->d[0], piece->d[1]);
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break;
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case bezierTo:
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cairo_curve_to(cr,
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piece->d[0],
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piece->d[1],
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piece->d[2],
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piece->d[3],
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piece->d[4],
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piece->d[5]);
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break;
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case closeFigure:
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cairo_close_path(cr);
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break;
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case addRect:
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cairo_rectangle(cr,
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piece->d[0],
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piece->d[1],
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piece->d[2],
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piece->d[3]);
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break;
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}
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}
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}
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uiDrawFillMode uiprivPathFillMode(uiDrawPath *path)
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{
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return path->fillMode;
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}
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