Initial revision

Change-Id: I97166917246ed4ce407b93cf744c0489dc156aff

1 files changed, 121 insertions, 0 deletions

diff --git a/transform.c b/transform.c
new file mode 100644
index 0000000..9495790
--- /dev/null
+++ b/transform.c
@@ -0,0 +1,121 @@
+/*
+ * transformed coordinate system objects for X
+ */
+/* $XFree86: xc/programs/xeyes/transform.c,v 1.4 2001/08/27 23:35:13 dawes Exp $ */
+
+# include	<X11/Xos.h>
+# include	<stdlib.h>
+# include	<X11/Xlib.h>
+# include	"transform.h"
+
+#if 0
+static XPoint *
+TranslatePoints (TPoint *points, int n_points, Transform *t, int mode)
+{
+	XPoint	*xpoints;
+	int	i;
+	double	xoff = 0.0, yoff = 0.0;
+
+	xpoints = (XPoint *) malloc (n_points * sizeof (*xpoints));
+	if (!xpoints)
+		return NULL;
+	for (i = 0; i < n_points; i++) {
+		xpoints[i].x = Xx(points[i].x + xoff, points[i].y + yoff, t);
+		xpoints[i].y = Xy(points[i].x + xoff, points[i].y + yoff, t);
+		if (mode == CoordModePrevious) {
+			xoff += points[i].x;
+			yoff += points[i].y;
+		}
+	}
+	return xpoints;
+}
+
+static void
+TFillPolygon (
+    Display	*dpy,
+    Drawable	d,
+    GC		gc,
+    Transform	*t,
+    TPoint	*points,
+    int		n_points,
+    int		shape,
+    int		mode)
+{
+	XPoint	*xpoints;
+
+	xpoints = TranslatePoints (points, n_points, t, mode);
+	if (xpoints) {
+		XFillPolygon (dpy, d, gc, xpoints, n_points, shape,
+				CoordModeOrigin);
+		free (xpoints);
+	}
+}
+
+static void
+TDrawArc (
+    Display	*dpy,
+    Drawable	d,
+    GC		gc,
+    Transform	*t,
+    double	x,
+    double	y,
+    double	width,
+    double	height,
+    int		angle1,
+    int		angle2)
+{
+	int	xx, xy, xw, xh;
+
+	xx = Xx(x,y,t);
+	xy = Xy(x,y,t);
+	xw = Xwidth (width, height, t);
+	xh = Xheight (width, height, t);
+	if (xw < 0) {
+		xx += xw;
+		xw = -xw;
+	}
+	if (xh < 0) {
+		xy += xh;
+		xh = -xh;
+	}
+	XDrawArc (dpy, d, gc, xx, xy, xw, xh, angle1, angle2);
+}
+#endif
+
+void
+TFillArc (dpy, d, gc, t, x, y, width, height, angle1, angle2)
+    Display	*dpy;
+    Drawable	d;
+    GC		gc;
+    Transform	*t;
+    double	x, y, width, height;
+    int		angle1, angle2;
+{
+	int	xx, xy, xw, xh;
+
+	xx = Xx(x,y,t);
+	xy = Xy(x,y,t);
+	xw = Xwidth (width, height, t);
+	xh = Xheight (width, height, t);
+	if (xw < 0) {
+		xx += xw;
+		xw = -xw;
+	}
+	if (xh < 0) {
+		xy += xh;
+		xh = -xh;
+	}
+	XFillArc (dpy, d, gc, xx, xy, xw, xh, angle1, angle2);
+}
+
+void
+SetTransform (t, xx1, xx2, xy1, xy2, tx1, tx2, ty1, ty2)
+    Transform	*t;
+    int		xx1, xx2, xy1, xy2;
+    double	tx1, tx2, ty1, ty2;
+{
+	t->mx = ((double) xx2 - xx1) / (tx2 - tx1);
+	t->bx = ((double) xx1) - t->mx * tx1;
+	t->my = ((double) xy2 - xy1) / (ty2 - ty1);
+	t->by = ((double) xy1) - t->my * ty1;
+}