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- /*
- * UserPath.m by Bruce Blumberg, NeXT Computer, Inc.
- *
- * You may freely copy,distribute and re-use the code in this example. NeXT
- * disclaims any warranty of any kind, expressed or implied, as to its fitness
- * for any particular purpose
- *
- */
-
- #import "UserPath.h"
- #import <mach/mach_init.h>
- #import <appkit/graphics.h>
- #import <appkit/errors.h>
- #import <math.h>
- #import <libc.h>
-
- static NXZone *upZone = NULL;
-
- NXZone *userPathZone()
- /* Creates a unique zone for use by all user paths */
- {
- if (!upZone) {
- upZone = NXCreateZone(vm_page_size, vm_page_size, 1);
- }
-
- return upZone;
- }
-
- UserPath *newUserPath()
- /* Creates a new User Path in the zone returned by userPathZone */
- {
- UserPath *up;
-
- up = (UserPath *)NXZoneMalloc(userPathZone(), sizeof(UserPath));
- up->max = 32;
- up->points = (float *)NXZoneMalloc(userPathZone(),
- sizeof(float) * up->max);
- up->ops = !0Cr *)NXZoneMalloc(userPathZone(),
- (2 + (up->max / 2)) * sizeof(char));
- up->ping = NO;
-
- return up;
- }
-
- void freeUserPath(UserPath *up)
- /* Frees User Path and its associated buffers */
- {
- free(up->points);
- free(up->ops);
- free(up);
-
- return;
- }
-
- void growUserPath(UserPath *up)
- /*
- * grows the associated buffers as necessary. buffer size doubles on each
- * call. You never need to call grow directly as it is called as needed by the
- * methods and functions which add elements into the buffer
- */
- {
- /* double the size of the internal buffers */
- up->max *= 2;
- up->points = (float *)NXZoneRealloc(userPathZone(), up->points,
- sizeof(float) * up->max);
- up->ops = (char *)NXZoneRealloc(userPathZone(), up->ops,
- (2 + (up->max / 2)) * sizeof(char));
-
- return;
- }
-
- void beginUserPath(UserPath *up, BOOL cache)
- /*
- * Call this to start generating a user path. The cache argument specifies if
- * you want the user path cached at the server (i.e. dps_ucache). In either
- * case, the UserPath object will automatically calculate the bounding box for
- * the path and add the dps_setbbox operator.
- */
- {
- up->numberOfPoints = up->numberOfOps = 0;
- up->cp.x = up->cp.y = 0;
- up->bbox[0] = up->bbox[1] = 1.0e6;
- up->bbox[2] = up->bbox[3] = -1.0e6;
- if (cache) {
- up->ops[up->numberOfOps++] = dps_ucache;
- }
- up->ops[up->numberOfOps++] = dps_setbbox;
- up->opForUserPath = 0;
-
- return;
- }
-
- void endUserPath(UserPath *up, int op)
- /*
- * Call this to stop filling the path. Note this does not send the userpath to
- * the server -- use sendUserPath. The op argument should be one of the
- * following:
- * dps_uappend, dps_ufill ,dps_ueofill, dps_ustroke, dps_ustrokepath,
- * dps_inufill, dps_inueofill, dps_inustroke, dps_def, dps_put.
- * These are defined in <dpsclient/dpsNext.h.
- */
- {
- up->opForUserPath = op;
-
- return;
- }
-
-
- void UPdebug(UserPath *up, BOOL shouldPing)
- /*
- * Sets ping to YES so that after each time a user path is sent down to the
- * window server, an NXPing() is sent after. The purpose is to catch PostScript
- * errors that may be generated by the user path. sendUserPath brackets the
- * download and the NXPing() in an NX_DURING... NX_HANDLER construct. Normally
- * ping is NO.
- */
- {
- up->ping = shouldPing;
-
- return;
- }
-
- int se!0DerPath(UserPath *up)
- /*
- * Call this to send the path down to the server. If ping==YES (set via
- * debug:), the function will send an NXPing() after the Path. In any event,
- * code is bracketed by a NX_DURING ... NX_HANDLER construct which will try to
- * catch postscript errors. If ping==NO (the default) it is unlikely to catch
- * errors, with ping==YES it will. Whether you can recover or not is another
- * matter. sendUserPath returns 0 on success and -1 on failure. If no previous
- * endUserPath: has been sent, will return -2 and will not send the path to the
- * server.
- */
- {
- NXHandler exception;
-
- exception.code = 0;
- if (up->opForUserPath != 0) {
- NX_DURING
- DPSDoUserPath(up->points, up->numberOfPoints, dps_float, up->ops,
- up->numberOfOps, up->bbox, up->opForUserPath);
- if (up->ping) {
- NXPing();
- }
-
- NX_HANDLER
- exception = NXLocalHandler;
- NX_ENDHANDLER
- if (exception.code) {
- NXReportError(&exception);
- if (exception.code == dps_err_ps) {
- return -1;
- }
- } else {
- return 0;
- }
- }
-
- return -1;
- }
-
- void checkBoundingBox(UserPath *up, float x, float y)
- /* Checks if bounding box needs to be enlarged based on x and y */
- {
- if (x < up->bbox[0]) {
- up->bbox[0] = x;
- }
- if (y < up->bbox[1]) {
- up->bbox[1] = y;
- }
- if (x > up->bbox[2]) {
- up->bbox[2] = x;
- }
- if (y > up->bbox[3]) {
- up->bbox[3] = y;
- }
-
- return;
- }
-
- void addPts(UserPath *up, float x, float y)
- /* adds x and y to user path. Updates bounding box as necessary */
- {
- if (!((up->numberOfPoints + 2) < up->max)) {
- growUserPath(up);
- }
-
- up->points[up->numberOfPoints++] = x;
- up->points[up->numberOfPoints++] = y;
- checkBoundingBox(up, x, y);
-
- return;
- }
-
- void addOp(UserPath *up, int op)
- /*
- * adds operator to user path. Operator should be one of the following:
- * dps_moveto, dps_rmoveto, dps_lineto, dps_rlineto, dps_curveto,
- * dps_rcurveto, dps_arc, dps_arcn, dps_arct, dps_closepath.
- */
- {
- up->ops[up->numberOfOps++] = op;
-
- return;
- }
-
- void add(UserPath *up, int op, float x, float y)
- /*
- * adds operator and x and y to user path. Operator should be one of the
- * operators above
- */
- {
- if (!((up->numberOfPoints + 2) < up->max)) {
- growUserPath(up);
- }
-
- up->ops[up->numberOfOps++] = op;
- up->points[!0EnumberOfPoints++] = x;
- up->points[up->numberOfPoints++] = y;
- checkBoundingBox(up, x, y);
-
- return;
- }
-
- void UPmoveto(UserPath *up, float x, float y)
- /* adds <x y moveto> to user path and updates bounding box */
- {
- add(up, dps_moveto, x, y);
- up->cp.x = x;
- up->cp.y = y;
-
- return;
- }
-
- void UPrmoveto(UserPath *up, float x, float y)
- /* adds <x y rmoveto> to user path and updates bounding box */
- {
- if (!((up->numberOfPoints + 2) < up->max)) {
- growUserPath(up);
- }
- up->ops[up->numberOfOps++] = dps_rmoveto;
- up->points[up->numberOfPoints++] = x;
- up->points[up->numberOfPoints++] = y;
- up->cp.x += x;
- up->cp.y += y;
- checkBoundingBox(up, up->cp.x, up->cp.y);
-
- return;
- }
-
- void UPlineto(UserPath *up, float x, float y)
- /* adds <x y lineto> to user path and updates bounding box */
- {
- add(up, dps_lineto, x, y);
- up->cp.x = x;
- up->cp.y = y;
-
- return;
- }
-
- void UPrlineto(UserPath *up, float x, float y)
- /* adds <x y rlineto> to user path and updates bounding box */
- {
- if (!((up->numberOfPoints + 2) < up->max)) {
- growUserPath(up);
- }
- up->ops[up->numberOfOps++] = dps_rlineto;
- up->points[up->numberOfPoints++] = x;
- up->points[up->numberOfPoints++] = y;
- up->cp.x += x;
- up->cp.y += y;
- checkBoundingBox(up, up->cp.x, up->cp.y);
-
- return;
- }
-
- void UPcurveto(UserPath *up, float x1, float y1, float x2, float y2, float x3,
- float y3)
- /* adds <x1 y1 x2 y2 curveto> to user path and updates bounding box */
- {
- addPts(up, x1, y1);
- addPts(up, x2, y2);
- add(up, dps_curveto, x3, y3);
- up->cp.x = x3;
- up->cp.y = y3;
-
- return;
- }
-
- void UPrcurveto(UserPath *up, float dx1, float dy1, float dx2, float dy2,
- float dx3, float dy3)
- /* adds <x1 y1 x2 y2 rcurveto> to user path and updates bounding box */
- {
- if (!((up->numberOfPoints + 6) < up->max)) {
- growUserPath(up);
- }
- up->ops[up->numberOfOps++] = dps_rcurveto;
- up->points[up->numberOfPoints++] = dx1;
- up->points[up->numberOfPoints++] = dy1;
- up->points[up->numberOfPoints++] = dx2;
- up->points[up->numberOfPoints++] = dy2;
- up->points[up->numberOfPoints++] = dx3;
- up->points[up->numberOfPoints++] = dy3;
- checkBoundingBox(up, up->cp.x + dx1, up->cp.y + dy1);
- checkBoundingBox(up, up->cp.x + dx2, up->cp.y + dy2);
- checkBound!0Fox(up, up->cp.x + dx3, up->cp.y + dy3);
- up->cp.x = dx3;
- up->cp.y = dy3;
-
- return;
- }
-
- void UParc(UserPath *up, float x, float y, float r, float ang1, float ang2)
- /* adds <x y r ang1 ang2 arc> to user path and updates bounding box */
- {
- if (!((up->numberOfPoints + 5) < up->max)) {
- growUserPath(up);
- }
- up->ops[up->numberOfOps++] = dps_arc;
- up->points[up->numberOfPoints++] = x;
- up->points[up->numberOfPoints++] = y;
- up->points[up->numberOfPoints++] = r;
- up->points[up->numberOfPoints++] = ang1;
- up->points[up->numberOfPoints++] = ang2;
- checkBoundingBox(up, x + r, y + r);
- checkBoundingBox(up, x - r, y - r);
- up->cp.x = x + cos(ang2 / 57.3) * r;
- up->cp.y = y + sin(ang2 / 57.3) * r;
-
- return;
- }
-
- void UParcn(UserPath *up, float x, float y, float r, float ang1, float ang2)
- /* adds <x y r ang1 ang2 arcn> to user path and updates bounding box */
- {
- if (!((up->numberOfPoints + 5) < up->max)) {
- growUserPath(up);
- }
- up->ops[up->numberOfOps++] = dps_arcn;
- up->points[up->numberOfPoints++] = x;
- up->points[up->numberOfPoints++] = y;
- up->points[up->numberOfPoints++] = r;
- up->points[up->numberOfPoints++] = ang1;
- up->points[up->numberOfPoints++] = ang2;
- checkBoundingBox(up, x + r, y + r);
- checkBoundingBox(up, x - r, y - r);
- up->cp.x = x + cos(ang2 / 57.3) * r;
- up->cp.y = y + sin(ang2 / 57.3) * r;
-
- return;
- }
-
- void UParct(UserPath *up, float x1, float y1, float x2, float y2, float r)
- /* adds <x1 y1 x2 y2 r arct> to user path and updates bounding box */
- {
- if (!((up->numberOfPoints + 5) < up->max)) {
- growUserPath(up);
- }
- up->ops[up->numberOfOps++] = dps_arcn;
- up->points[up->numberOfPoints++] = x1;
- up->points[up->numberOfPoints++] = y1;
- up->points[up->numberOfPoints++] = x2;
- up->points[up->numberOfPoints++] = y2;
- up->points[up->numberOfPoints++] = r;
- checkBoundingBox(up, x1, y1);
- checkBoundingBox(up, x2, y2);
- up->cp.x = x2;
- up->cp.y = y2;
-
- return;
- }
-
- void closePath(UserPath *up)
- /* adds <closepath> to user path and updates bounding box */
- {
- up->ops[up->numberOfOps++] = dps_closepath;
-
- return;
- }
-