First Commit

libui-ng/unix/drawpath.c

@@ -0,0 +1,204 @@
+// 6 september 2015
+#include "uipriv_unix.h"
+#include "draw.h"
+
+struct uiDrawPath {
+	GArray *pieces;
+	uiDrawFillMode fillMode;
+	gboolean ended;
+};
+
+struct piece {
+	int type;
+	double d[8];
+	int b;
+};
+
+enum {
+	newFigure,
+	newFigureArc,
+	lineTo,
+	arcTo,
+	bezierTo,
+	closeFigure,
+	addRect,
+};
+
+uiDrawPath *uiDrawNewPath(uiDrawFillMode mode)
+{
+	uiDrawPath *p;
+
+	p = uiprivNew(uiDrawPath);
+	p->pieces = g_array_new(FALSE, TRUE, sizeof (struct piece));
+	p->fillMode = mode;
+	return p;
+}
+
+void uiDrawFreePath(uiDrawPath *p)
+{
+	g_array_free(p->pieces, TRUE);
+	uiprivFree(p);
+}
+
+static void add(uiDrawPath *p, struct piece *piece)
+{
+	if (p->ended)
+		uiprivUserBug("You cannot modify a uiDrawPath that has been ended. (path: %p)", p);
+	g_array_append_vals(p->pieces, piece, 1);
+}
+
+void uiDrawPathNewFigure(uiDrawPath *p, double x, double y)
+{
+	struct piece piece;
+
+	piece.type = newFigure;
+	piece.d[0] = x;
+	piece.d[1] = y;
+	add(p, &piece);
+}
+
+void uiDrawPathNewFigureWithArc(uiDrawPath *p, double xCenter, double yCenter, double radius, double startAngle, double sweep, int negative)
+{
+	struct piece piece;
+
+	if (sweep > 2 * uiPi)
+		sweep = 2 * uiPi;
+	piece.type = newFigureArc;
+	piece.d[0] = xCenter;
+	piece.d[1] = yCenter;
+	piece.d[2] = radius;
+	piece.d[3] = startAngle;
+	piece.d[4] = sweep;
+	piece.b = negative;
+	add(p, &piece);
+}
+
+void uiDrawPathLineTo(uiDrawPath *p, double x, double y)
+{
+	struct piece piece;
+
+	piece.type = lineTo;
+	piece.d[0] = x;
+	piece.d[1] = y;
+	add(p, &piece);
+}
+
+void uiDrawPathArcTo(uiDrawPath *p, double xCenter, double yCenter, double radius, double startAngle, double sweep, int negative)
+{
+	struct piece piece;
+
+	if (sweep > 2 * uiPi)
+		sweep = 2 * uiPi;
+	piece.type = arcTo;
+	piece.d[0] = xCenter;
+	piece.d[1] = yCenter;
+	piece.d[2] = radius;
+	piece.d[3] = startAngle;
+	piece.d[4] = sweep;
+	piece.b = negative;
+	add(p, &piece);
+}
+
+void uiDrawPathBezierTo(uiDrawPath *p, double c1x, double c1y, double c2x, double c2y, double endX, double endY)
+{
+	struct piece piece;
+
+	piece.type = bezierTo;
+	piece.d[0] = c1x;
+	piece.d[1] = c1y;
+	piece.d[2] = c2x;
+	piece.d[3] = c2y;
+	piece.d[4] = endX;
+	piece.d[5] = endY;
+	add(p, &piece);
+}
+
+void uiDrawPathCloseFigure(uiDrawPath *p)
+{
+	struct piece piece;
+
+	piece.type = closeFigure;
+	add(p, &piece);
+}
+
+void uiDrawPathAddRectangle(uiDrawPath *p, double x, double y, double width, double height)
+{
+	struct piece piece;
+
+	piece.type = addRect;
+	piece.d[0] = x;
+	piece.d[1] = y;
+	piece.d[2] = width;
+	piece.d[3] = height;
+	add(p, &piece);
+}
+
+void uiDrawPathEnd(uiDrawPath *p)
+{
+	p->ended = TRUE;
+}
+
+int uiDrawPathEnded(uiDrawPath *p)
+{
+	return p->ended == TRUE ? 1 : 0;
+}
+
+void uiprivRunPath(uiDrawPath *p, cairo_t *cr)
+{
+	guint i;
+	struct piece *piece;
+	void (*arc)(cairo_t *, double, double, double, double, double);
+
+	if (!p->ended)
+		uiprivUserBug("You cannot draw with a uiDrawPath that has not been ended. (path: %p)", p);
+	cairo_new_path(cr);
+	for (i = 0; i < p->pieces->len; i++) {
+		piece = &g_array_index(p->pieces, struct piece, i);
+		switch (piece->type) {
+		case newFigure:
+			cairo_move_to(cr, piece->d[0], piece->d[1]);
+			break;
+		case newFigureArc:
+			cairo_new_sub_path(cr);
+			// fall through
+		case arcTo:
+			arc = cairo_arc;
+			if (piece->b)
+				arc = cairo_arc_negative;
+			(*arc)(cr,
+				piece->d[0],
+				piece->d[1],
+				piece->d[2],
+				piece->d[3],
+				piece->d[3] + piece->d[4]);
+			break;
+		case lineTo:
+			cairo_line_to(cr, piece->d[0], piece->d[1]);
+			break;
+		case bezierTo:
+			cairo_curve_to(cr,
+				piece->d[0],
+				piece->d[1],
+				piece->d[2],
+				piece->d[3],
+				piece->d[4],
+				piece->d[5]);
+			break;
+		case closeFigure:
+			cairo_close_path(cr);
+			break;
+		case addRect:
+			cairo_rectangle(cr,
+				piece->d[0],
+				piece->d[1],
+				piece->d[2],
+				piece->d[3]);
+			break;
+		}
+	}
+}
+
+uiDrawFillMode uiprivPathFillMode(uiDrawPath *path)
+{
+	return path->fillMode;
+}