1 // panel_io.cxx - I/O for 2D panel.
3 // Written by David Megginson, started January 2000.
5 // This program is free software; you can redistribute it and/or
6 // modify it under the terms of the GNU General Public License as
7 // published by the Free Software Foundation; either version 2 of the
8 // License, or (at your option) any later version.
10 // This program is distributed in the hope that it will be useful, but
11 // WITHOUT ANY WARRANTY; without even the implied warranty of
12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 // General Public License for more details.
15 // You should have received a copy of the GNU General Public License
16 // along with this program; if not, write to the Free Software
17 // Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
29 #include <string.h> // for strcmp()
31 #include <simgear/compiler.h>
32 #include <simgear/misc/exception.hxx>
34 #include <simgear/misc/sg_path.hxx>
35 #include <simgear/debug/logstream.hxx>
36 #include <simgear/misc/props.hxx>
42 #include <Main/globals.hxx>
43 #include <Main/fg_props.hxx>
48 #include "panel_io.hxx"
51 #include "built_in/FGMagRibbon.hxx"
53 SG_USING_STD(istream);
54 SG_USING_STD(ifstream);
59 ////////////////////////////////////////////////////////////////////////
60 // Read and construct a panel.
62 // The panel is specified as a regular property list, and each of the
63 // instruments is its own, separate property list (and thus, a separate
64 // XML document). The functions in this section read in the files
65 // as property lists, then extract properties to set up the panel
68 // A panel contains zero or more instruments.
70 // An instrument contains one or more layers and zero or more actions.
72 // A layer contains zero or more transformations.
74 // Some special types of layers also contain other objects, such as
75 // chunks of text or other layers.
77 // There are currently four types of layers:
79 // 1. Textured Layer (type="texture"), the default
80 // 2. Text Layer (type="text")
81 // 3. Switch Layer (type="switch")
82 // 4. Built-in Layer (type="built-in", must also specify class)
84 // The only built-in layer so far is the ribbon for the magnetic compass
85 // (class="compass-ribbon").
87 // There are three types of actions:
89 // 1. Adjust (type="adjust"), the default
90 // 2. Swap (type="swap")
91 // 3. Toggle (type="toggle")
93 // There are three types of transformations:
95 // 1. X shift (type="x-shift"), the default
96 // 2. Y shift (type="y-shift")
97 // 3. Rotation (type="rotation")
99 // Each of these may be associated with a property, so that a needle
100 // will rotate with the airspeed, for example, or may have a fixed
101 // floating-point value.
102 ////////////////////////////////////////////////////////////////////////
106 * Read a cropped texture from the instrument's property list.
108 * The x1 and y1 properties give the starting position of the texture
109 * (between 0.0 and 1.0), and the the x2 and y2 properties give the
110 * ending position. For example, to use the bottom-left quarter of a
111 * texture, x1=0.0, y1=0.0, x2=0.5, y2=0.5.
113 static FGCroppedTexture
114 readTexture (const SGPropertyNode * node)
116 FGCroppedTexture texture(node->getStringValue("path"),
117 node->getFloatValue("x1"),
118 node->getFloatValue("y1"),
119 node->getFloatValue("x2", 1.0),
120 node->getFloatValue("y2", 1.0));
121 SG_LOG(SG_COCKPIT, SG_DEBUG, "Read texture " << node->getName());
127 * Test for a condition in the current node.
130 ////////////////////////////////////////////////////////////////////////
131 // Read a condition and use it if necessary.
132 ////////////////////////////////////////////////////////////////////////
135 readConditions (FGConditional * component, const SGPropertyNode * node)
137 const SGPropertyNode * conditionNode = node->getChild("condition");
138 if (conditionNode != 0)
139 // The top level is implicitly AND
140 component->setCondition(fgReadCondition(conditionNode));
145 * Read an action from the instrument's property list.
147 * The action will be performed when the user clicks a mouse button
148 * within the specified region of the instrument. Actions always work
149 * by modifying the value of a property (see the SGPropertyNode
152 * The following action types are defined:
154 * "adjust" - modify the value of a floating-point property by
155 * the increment specified. This is the default.
157 * "swap" - swap the values of two-floating-point properties.
159 * "toggle" - toggle the value of a boolean property between true and
162 * For the adjust action, it is possible to specify an increment
163 * (use a negative number for a decrement), a minimum allowed value,
164 * a maximum allowed value, and a flag to indicate whether the value
165 * should freeze or wrap-around when it reachs the minimum or maximum.
167 * The action will be scaled automatically if the instrument is not
168 * being drawn at its regular size.
170 static FGPanelAction *
171 readAction (const SGPropertyNode * node, float w_scale, float h_scale)
173 string name = node->getStringValue("name");
175 int button = node->getIntValue("button");
176 int x = int(node->getIntValue("x") * w_scale);
177 int y = int(node->getIntValue("y") * h_scale);
178 int w = int(node->getIntValue("w") * w_scale);
179 int h = int(node->getIntValue("h") * h_scale);
180 bool repeatable = node->getBoolValue("repeatable", true);
182 FGPanelAction * action = new FGPanelAction(button, x, y, w, h, repeatable);
184 vector<SGPropertyNode_ptr>bindings = node->getChildren("binding");
187 for (i = 0; i < bindings.size(); i++) {
188 SG_LOG(SG_INPUT, SG_INFO, "Reading binding "
189 << bindings[i]->getStringValue("command"));
190 action->addBinding(new FGBinding(bindings[i]), 0);
193 if (node->hasChild("mod-up")) {
194 bindings = node->getChild("mod-up")->getChildren("binding");
195 for (i = 0; i < bindings.size(); i++) {
196 action->addBinding(new FGBinding(bindings[i]), 1);
200 readConditions(action, node);
206 * Read a transformation from the instrument's property list.
208 * The panel module uses the transformations to slide or spin needles,
209 * knobs, and other indicators, and to place layers in the correct
210 * positions. Every layer starts centered exactly on the x,y co-ordinate,
211 * and many layers need to be moved or rotated simply to display the
212 * instrument correctly.
214 * There are three types of transformations:
216 * "x-shift" - move the layer horizontally.
218 * "y-shift" - move the layer vertically.
220 * "rotation" - rotate the layer.
222 * Each transformation may have a fixed offset, and may also have
223 * a floating-point property value to add to the offset. The
224 * floating-point property may be clamped to a minimum and/or
225 * maximum range and scaled (after clamping).
227 * Note that because of the way OpenGL works, transformations will
228 * appear to be applied backwards.
230 static FGPanelTransformation *
231 readTransformation (const SGPropertyNode * node, float w_scale, float h_scale)
233 FGPanelTransformation * t = new FGPanelTransformation;
235 string name = node->getName();
236 string type = node->getStringValue("type");
237 string propName = node->getStringValue("property", "");
238 SGPropertyNode * target = 0;
241 SG_LOG( SG_COCKPIT, SG_ALERT,
242 "No type supplied for transformation " << name
243 << " assuming \"rotation\"" );
247 if (!propName.empty()) {
248 target = fgGetNode(propName.c_str(), true);
252 t->min = node->getFloatValue("min", -9999999);
253 t->max = node->getFloatValue("max", 99999999);
254 t->factor = node->getFloatValue("scale", 1.0);
255 t->offset = node->getFloatValue("offset", 0.0);
257 // Check for an interpolation table
258 const SGPropertyNode * trans_table = node->getNode("interpolation");
259 if (trans_table != 0) {
260 SG_LOG( SG_COCKPIT, SG_INFO, "Found interpolation table with "
261 << trans_table->nChildren() << "children" );
262 t->table = new SGInterpTable();
263 for(int i = 0; i < trans_table->nChildren(); i++) {
264 const SGPropertyNode * node = trans_table->getChild(i);
265 if (!strcmp(node->getName(), "entry")) {
266 double ind = node->getDoubleValue("ind", 0.0);
267 double dep = node->getDoubleValue("dep", 0.0);
268 SG_LOG( SG_COCKPIT, SG_INFO, "Adding interpolation entry "
269 << ind << "==>" << dep );
270 t->table->addEntry(ind, dep);
272 SG_LOG( SG_COCKPIT, SG_INFO, "Skipping " << node->getName()
273 << " in interpolation" );
280 // Move the layer horizontally.
281 if (type == "x-shift") {
282 t->type = FGPanelTransformation::XSHIFT;
283 // t->min *= w_scale; //removed by Martin Dressler
284 // t->max *= w_scale; //removed by Martin Dressler
285 t->offset *= w_scale;
286 t->factor *= w_scale; //Added by Martin Dressler
289 // Move the layer vertically.
290 else if (type == "y-shift") {
291 t->type = FGPanelTransformation::YSHIFT;
292 //t->min *= h_scale; //removed
293 //t->max *= h_scale; //removed
294 t->offset *= h_scale;
295 t->factor *= h_scale; //Added
298 // Rotate the layer. The rotation
299 // is in degrees, and does not need
300 // to scale with the instrument size.
301 else if (type == "rotation") {
302 t->type = FGPanelTransformation::ROTATION;
306 SG_LOG( SG_COCKPIT, SG_ALERT, "Unrecognized transformation type " << type );
311 readConditions(t, node);
312 SG_LOG( SG_COCKPIT, SG_DEBUG, "Read transformation " << name );
318 * Read a chunk of text from the instrument's property list.
320 * A text layer consists of one or more chunks of text. All chunks
321 * share the same font size and color (and eventually, font), but
322 * each can come from a different source. There are three types of
325 * "literal" - a literal text string (the default)
327 * "text-value" - the current value of a string property
329 * "number-value" - the current value of a floating-point property.
331 * All three may also include a printf-style format string.
334 readTextChunk (const SGPropertyNode * node)
336 FGTextLayer::Chunk * chunk;
337 string name = node->getStringValue("name");
338 string type = node->getStringValue("type");
339 string format = node->getStringValue("format");
341 // Default to literal text.
343 SG_LOG( SG_COCKPIT, SG_INFO, "No type provided for text chunk " << name
344 << " assuming \"literal\"");
348 // A literal text string.
349 if (type == "literal") {
350 string text = node->getStringValue("text");
351 chunk = new FGTextLayer::Chunk(text, format);
354 // The value of a string property.
355 else if (type == "text-value") {
356 SGPropertyNode * target =
357 fgGetNode(node->getStringValue("property"), true);
358 chunk = new FGTextLayer::Chunk(FGTextLayer::TEXT_VALUE, target, format);
361 // The value of a float property.
362 else if (type == "number-value") {
363 string propName = node->getStringValue("property");
364 float scale = node->getFloatValue("scale", 1.0);
365 SGPropertyNode * target = fgGetNode(propName.c_str(), true);
366 chunk = new FGTextLayer::Chunk(FGTextLayer::DOUBLE_VALUE, target,
372 SG_LOG( SG_COCKPIT, SG_ALERT, "Unrecognized type " << type
373 << " for text chunk " << name );
377 readConditions(chunk, node);
383 * Read a single layer from an instrument's property list.
385 * Each instrument consists of one or more layers stacked on top
386 * of each other; the lower layers show through only where the upper
387 * layers contain an alpha component. Each layer can be moved
388 * horizontally and vertically and rotated using transformations.
390 * This module currently recognizes four kinds of layers:
392 * "texture" - a layer containing a texture (the default)
394 * "text" - a layer containing text
396 * "switch" - a layer that switches between two other layers
397 * based on the current value of a boolean property.
399 * "built-in" - a hard-coded layer supported by C++ code in FlightGear.
401 * Currently, the only built-in layer class is "compass-ribbon".
403 static FGInstrumentLayer *
404 readLayer (const SGPropertyNode * node, float w_scale, float h_scale)
406 FGInstrumentLayer * layer = NULL;
407 string name = node->getStringValue("name");
408 string type = node->getStringValue("type");
409 int w = node->getIntValue("w", -1);
410 int h = node->getIntValue("h", -1);
412 w = int(w * w_scale);
414 h = int(h * h_scale);
418 SG_LOG( SG_COCKPIT, SG_ALERT,
419 "No type supplied for layer " << name
420 << " assuming \"texture\"" );
425 // A textured instrument layer.
426 if (type == "texture") {
427 FGCroppedTexture texture = readTexture(node->getNode("texture"));
428 layer = new FGTexturedLayer(texture, w, h);
431 // A group of sublayers.
432 else if (type == "group") {
433 layer = new FGGroupLayer();
434 for (int i = 0; i < node->nChildren(); i++) {
435 const SGPropertyNode * child = node->getChild(i);
436 cerr << "Trying child " << child->getName() << endl;
437 if (!strcmp(child->getName(), "layer")) {
438 cerr << "succeeded!" << endl;
439 ((FGGroupLayer *)layer)->addLayer(readLayer(child, w_scale, h_scale));
445 // A textual instrument layer.
446 else if (type == "text") {
447 FGTextLayer * tlayer = new FGTextLayer(w, h); // FIXME
449 // Set the text color.
450 float red = node->getFloatValue("color/red", 0.0);
451 float green = node->getFloatValue("color/green", 0.0);
452 float blue = node->getFloatValue("color/blue", 0.0);
453 tlayer->setColor(red, green, blue);
455 // Set the point size.
456 float pointSize = node->getFloatValue("point-size", 10.0) * w_scale;
457 tlayer->setPointSize(pointSize);
460 string fontName = node->getStringValue("font", "default");
461 tlayer->setFontName(fontName);
463 const SGPropertyNode * chunk_group = node->getNode("chunks");
464 if (chunk_group != 0) {
465 int nChunks = chunk_group->nChildren();
466 for (int i = 0; i < nChunks; i++) {
467 const SGPropertyNode * node = chunk_group->getChild(i);
468 if (!strcmp(node->getName(), "chunk")) {
469 FGTextLayer::Chunk * chunk = readTextChunk(node);
471 tlayer->addChunk(chunk);
473 SG_LOG( SG_COCKPIT, SG_INFO, "Skipping " << node->getName()
481 // A switch instrument layer.
482 else if (type == "switch") {
483 SGPropertyNode * target =
484 fgGetNode(node->getStringValue("property"), true);
485 FGInstrumentLayer * layer1 =
486 readLayer(node->getNode("layer[0]"), w_scale, h_scale);
487 FGInstrumentLayer * layer2 =
488 readLayer(node->getNode("layer[1]"), w_scale, h_scale);
489 layer = new FGSwitchLayer(w, h, target, layer1, layer2);
492 // A built-in instrument layer.
493 else if (type == "built-in") {
494 string layerclass = node->getStringValue("class");
496 if (layerclass == "mag-ribbon") {
497 layer = new FGMagRibbon(w, h);
500 else if (layerclass.empty()) {
501 SG_LOG( SG_COCKPIT, SG_ALERT, "No class provided for built-in layer "
507 SG_LOG( SG_COCKPIT, SG_ALERT, "Unknown built-in layer class "
515 SG_LOG( SG_COCKPIT, SG_ALERT, "Unrecognized layer type " << type );
521 // Get the transformations for each layer.
523 const SGPropertyNode * trans_group = node->getNode("transformations");
524 if (trans_group != 0) {
525 int nTransformations = trans_group->nChildren();
526 for (int i = 0; i < nTransformations; i++) {
527 const SGPropertyNode * node = trans_group->getChild(i);
528 if (!strcmp(node->getName(), "transformation")) {
529 FGPanelTransformation * t = readTransformation(node, w_scale, h_scale);
531 layer->addTransformation(t);
533 SG_LOG( SG_COCKPIT, SG_INFO, "Skipping " << node->getName()
534 << " in transformations" );
539 readConditions(layer, node);
540 SG_LOG( SG_COCKPIT, SG_DEBUG, "Read layer " << name );
546 * Read an instrument from a property list.
548 * The instrument consists of a preferred width and height
549 * (the panel may override these), together with a list of layers
550 * and a list of actions to be performed when the user clicks
551 * the mouse over the instrument. All co-ordinates are relative
552 * to the instrument's position, so instruments are fully relocatable;
553 * likewise, co-ordinates for actions and transformations will be
554 * scaled automatically if the instrument is not at its preferred size.
556 static FGPanelInstrument *
557 readInstrument (const SGPropertyNode * node)
559 const string name = node->getStringValue("name");
560 int x = node->getIntValue("x", -1);
561 int y = node->getIntValue("y", -1);
562 int real_w = node->getIntValue("w", -1);
563 int real_h = node->getIntValue("h", -1);
564 int w = node->getIntValue("w-base", -1);
565 int h = node->getIntValue("h-base", -1);
567 if (x == -1 || y == -1) {
568 SG_LOG( SG_COCKPIT, SG_ALERT,
569 "x and y positions must be specified and > 0" );
576 w_scale = float(real_w) / float(w);
580 h_scale = float(real_h) / float(h);
584 SG_LOG( SG_COCKPIT, SG_DEBUG, "Reading instrument " << name );
586 FGLayeredInstrument * instrument =
587 new FGLayeredInstrument(x, y, w, h);
590 // Get the actions for the instrument.
592 const SGPropertyNode * action_group = node->getNode("actions");
593 if (action_group != 0) {
594 int nActions = action_group->nChildren();
595 for (int i = 0; i < nActions; i++) {
596 const SGPropertyNode * node = action_group->getChild(i);
597 if (!strcmp(node->getName(), "action")) {
598 FGPanelAction * action = readAction(node, w_scale, h_scale);
600 instrument->addAction(action);
602 SG_LOG( SG_COCKPIT, SG_INFO, "Skipping " << node->getName()
609 // Get the layers for the instrument.
611 const SGPropertyNode * layer_group = node->getNode("layers");
612 if (layer_group != 0) {
613 int nLayers = layer_group->nChildren();
614 for (int i = 0; i < nLayers; i++) {
615 const SGPropertyNode * node = layer_group->getChild(i);
616 if (!strcmp(node->getName(), "layer")) {
617 FGInstrumentLayer * layer = readLayer(node, w_scale, h_scale);
619 instrument->addLayer(layer);
621 SG_LOG( SG_COCKPIT, SG_INFO, "Skipping " << node->getName()
627 readConditions(instrument, node);
628 SG_LOG( SG_COCKPIT, SG_DEBUG, "Done reading instrument " << name );
634 * Construct the panel from a property tree.
637 readPanel (const SGPropertyNode * root)
639 SG_LOG( SG_COCKPIT, SG_INFO, "Reading properties for panel " <<
640 root->getStringValue("name", "[Unnamed Panel]") );
642 FGPanel * panel = new FGPanel();
643 panel->setWidth(root->getIntValue("w", 1024));
644 panel->setHeight(root->getIntValue("h", 443));
647 // Grab the visible external viewing area, default to
649 panel->setViewHeight(root->getIntValue("view-height",
650 768 - panel->getHeight() + 2));
653 // Grab the panel's initial offsets, default to 0, 0.
655 if (!fgHasNode("/sim/panel/x-offset"))
656 fgSetInt("/sim/panel/x-offset", root->getIntValue("x-offset", 0));
658 // conditional removed by jim wilson to allow panel xml code
659 // with y-offset defined to work...
660 if (!fgHasNode("/sim/panel/y-offset"))
661 fgSetInt("/sim/panel/y-offset", root->getIntValue("y-offset", 0));
664 // Assign the background texture, if any, or a bogus chequerboard.
666 string bgTexture = root->getStringValue("background");
667 if (bgTexture.empty())
669 panel->setBackground(FGTextureManager::createTexture(bgTexture.c_str()));
670 SG_LOG( SG_COCKPIT, SG_INFO, "Set background texture to " << bgTexture );
673 // Get multibackground if any...
675 string mbgTexture = root->getStringValue("multibackground[0]");
676 if (!mbgTexture.empty()) {
677 panel->setMultiBackground(FGTextureManager::createTexture(mbgTexture.c_str()), 0);
678 SG_LOG( SG_COCKPIT, SG_INFO, "Set background texture to " << mbgTexture );
680 mbgTexture = root->getStringValue("multibackground[1]");
681 if (mbgTexture.empty())
683 panel->setMultiBackground(FGTextureManager::createTexture(mbgTexture.c_str()), 1);
684 SG_LOG( SG_COCKPIT, SG_INFO, "Set background texture to " << mbgTexture );
686 mbgTexture = root->getStringValue("multibackground[2]");
687 if (mbgTexture.empty())
689 panel->setMultiBackground(FGTextureManager::createTexture(mbgTexture.c_str()), 2);
690 SG_LOG( SG_COCKPIT, SG_INFO, "Set background texture to " << mbgTexture );
692 mbgTexture = root->getStringValue("multibackground[3]");
693 if (mbgTexture.empty())
695 panel->setMultiBackground(FGTextureManager::createTexture(mbgTexture.c_str()), 3);
696 SG_LOG( SG_COCKPIT, SG_INFO, "Set background texture to " << mbgTexture );
698 mbgTexture = root->getStringValue("multibackground[4]");
699 if (mbgTexture.empty())
701 panel->setMultiBackground(FGTextureManager::createTexture(mbgTexture.c_str()), 4);
702 SG_LOG( SG_COCKPIT, SG_INFO, "Set background texture to " << mbgTexture );
704 mbgTexture = root->getStringValue("multibackground[5]");
705 if (mbgTexture.empty())
707 panel->setMultiBackground(FGTextureManager::createTexture(mbgTexture.c_str()), 5);
708 SG_LOG( SG_COCKPIT, SG_INFO, "Set background texture to " << mbgTexture );
710 mbgTexture = root->getStringValue("multibackground[6]");
711 if (mbgTexture.empty())
713 panel->setMultiBackground(FGTextureManager::createTexture(mbgTexture.c_str()), 6);
714 SG_LOG( SG_COCKPIT, SG_INFO, "Set background texture to " << mbgTexture );
716 mbgTexture = root->getStringValue("multibackground[7]");
717 if (mbgTexture.empty())
719 panel->setMultiBackground(FGTextureManager::createTexture(mbgTexture.c_str()), 7);
720 SG_LOG( SG_COCKPIT, SG_INFO, "Set background texture to " << mbgTexture );
727 // Create each instrument.
729 SG_LOG( SG_COCKPIT, SG_INFO, "Reading panel instruments" );
730 const SGPropertyNode * instrument_group = root->getChild("instruments");
731 if (instrument_group != 0) {
732 int nInstruments = instrument_group->nChildren();
733 for (int i = 0; i < nInstruments; i++) {
734 const SGPropertyNode * node = instrument_group->getChild(i);
735 if (!strcmp(node->getName(), "instrument")) {
736 FGPanelInstrument * instrument = readInstrument(node);
738 panel->addInstrument(instrument);
740 SG_LOG( SG_COCKPIT, SG_INFO, "Skipping " << node->getName()
741 << " in instruments section" );
745 SG_LOG( SG_COCKPIT, SG_INFO, "Done reading panel instruments" );
749 // Return the new panel.
756 * Read a panel from a property list.
758 * Each panel instrument will appear in its own, separate
759 * property list. The top level simply names the panel and
760 * places the instruments in their appropriate locations (and
761 * optionally resizes them if necessary).
763 * Returns 0 if the read fails for any reason.
766 fgReadPanel (istream &input)
771 readProperties(input, &root);
772 } catch (const sg_exception &e) {
773 guiErrorMessage("Error reading panel: ", e);
776 return readPanel(&root);
781 * Read a panel from a property list.
783 * This function opens a stream to a file, then invokes the
784 * main fgReadPanel() function.
787 fgReadPanel (const string &relative_path)
789 SGPath path(globals->get_fg_root());
790 path.append(relative_path);
794 readProperties(path.str(), &root);
795 } catch (const sg_exception &e) {
796 guiErrorMessage("Error reading panel: ", e);
799 return readPanel(&root);
804 // end of panel_io.cxx