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 <simgear/compiler.h>
30 #include <simgear/misc/exception.hxx>
32 #include <simgear/misc/sg_path.hxx>
33 #include <simgear/debug/logstream.hxx>
34 #include <simgear/misc/props.hxx>
40 #include <Main/globals.hxx>
41 #include <Main/fg_props.hxx>
47 #include "panel_io.hxx"
49 #if !defined (SG_HAVE_NATIVE_SGI_COMPILERS)
50 SG_USING_STD(istream);
51 SG_USING_STD(ifstream);
57 ////////////////////////////////////////////////////////////////////////
58 // Built-in layer for the magnetic compass ribbon layer.
60 // TODO: move this out into a special directory for built-in
61 // layers of various sorts.
62 ////////////////////////////////////////////////////////////////////////
64 class FGMagRibbon : public FGTexturedLayer
67 FGMagRibbon (int w, int h);
68 virtual ~FGMagRibbon () {}
73 FGMagRibbon::FGMagRibbon (int w, int h)
74 : FGTexturedLayer(w, h)
76 FGCroppedTexture texture("Aircraft/c172/Instruments/Textures/compass-ribbon.rgb");
83 double heading = FGSteam::get_MH_deg();
84 double xoffset, yoffset;
86 while (heading >= 360.0) {
89 while (heading < 0.0) {
93 if (heading >= 60.0 && heading <= 180.0) {
94 xoffset = heading / 240.0;
96 } else if (heading >= 150.0 && heading <= 270.0) {
97 xoffset = (heading - 90.0) / 240.0;
99 } else if (heading >= 240.0 && heading <= 360.0) {
100 xoffset = (heading - 180.0) / 240.0;
105 xoffset = (heading - 270.0) / 240.0;
109 xoffset = 1.0 - xoffset;
110 // Adjust to put the number in the centre
113 FGCroppedTexture &t = getTexture();
114 t.setCrop(xoffset, yoffset, xoffset + 0.5, yoffset + 0.25);
115 FGTexturedLayer::draw();
120 ////////////////////////////////////////////////////////////////////////
121 // Read and construct a panel.
123 // The panel is specified as a regular property list, and each of the
124 // instruments is its own, separate property list (and thus, a separate
125 // XML document). The functions in this section read in the files
126 // as property lists, then extract properties to set up the panel
129 // A panel contains zero or more instruments.
131 // An instrument contains one or more layers and zero or more actions.
133 // A layer contains zero or more transformations.
135 // Some special types of layers also contain other objects, such as
136 // chunks of text or other layers.
138 // There are currently four types of layers:
140 // 1. Textured Layer (type="texture"), the default
141 // 2. Text Layer (type="text")
142 // 3. Switch Layer (type="switch")
143 // 4. Built-in Layer (type="built-in", must also specify class)
145 // The only built-in layer so far is the ribbon for the magnetic compass
146 // (class="compass-ribbon").
148 // There are three types of actions:
150 // 1. Adjust (type="adjust"), the default
151 // 2. Swap (type="swap")
152 // 3. Toggle (type="toggle")
154 // There are three types of transformations:
156 // 1. X shift (type="x-shift"), the default
157 // 2. Y shift (type="y-shift")
158 // 3. Rotation (type="rotation")
160 // Each of these may be associated with a property, so that a needle
161 // will rotate with the airspeed, for example, or may have a fixed
162 // floating-point value.
163 ////////////////////////////////////////////////////////////////////////
167 * Read a cropped texture from the instrument's property list.
169 * The x1 and y1 properties give the starting position of the texture
170 * (between 0.0 and 1.0), and the the x2 and y2 properties give the
171 * ending position. For example, to use the bottom-left quarter of a
172 * texture, x1=0.0, y1=0.0, x2=0.5, y2=0.5.
174 static FGCroppedTexture
175 readTexture (const SGPropertyNode * node)
177 FGCroppedTexture texture(node->getStringValue("path"),
178 node->getFloatValue("x1"),
179 node->getFloatValue("y1"),
180 node->getFloatValue("x2", 1.0),
181 node->getFloatValue("y2", 1.0));
182 SG_LOG(SG_COCKPIT, SG_DEBUG, "Read texture " << node->getName());
188 * Read an action from the instrument's property list.
190 * The action will be performed when the user clicks a mouse button
191 * within the specified region of the instrument. Actions always work
192 * by modifying the value of a property (see the SGPropertyNode
195 * The following action types are defined:
197 * "adjust" - modify the value of a floating-point property by
198 * the increment specified. This is the default.
200 * "swap" - swap the values of two-floating-point properties.
202 * "toggle" - toggle the value of a boolean property between true and
205 * For the adjust action, it is possible to specify an increment
206 * (use a negative number for a decrement), a minimum allowed value,
207 * a maximum allowed value, and a flag to indicate whether the value
208 * should freeze or wrap-around when it reachs the minimum or maximum.
210 * The action will be scaled automatically if the instrument is not
211 * being drawn at its regular size.
213 static FGPanelAction *
214 readAction (const SGPropertyNode * node, float w_scale, float h_scale)
216 string name = node->getStringValue("name");
218 int button = node->getIntValue("button");
219 int x = int(node->getIntValue("x") * w_scale);
220 int y = int(node->getIntValue("y") * h_scale);
221 int w = int(node->getIntValue("w") * w_scale);
222 int h = int(node->getIntValue("h") * h_scale);
224 FGPanelAction * action = new FGPanelAction(button, x, y, w, h);
226 vector<const SGPropertyNode *>bindings = node->getChildren("binding");
227 for (int i = 0; i < bindings.size(); i++) {
228 SG_LOG(SG_INPUT, SG_INFO, "Reading binding "
229 << bindings[i]->getStringValue("command"));
230 action->addBinding(FGBinding(bindings[i])); // TODO: allow modifiers
238 * Read a transformation from the instrument's property list.
240 * The panel module uses the transformations to slide or spin needles,
241 * knobs, and other indicators, and to place layers in the correct
242 * positions. Every layer starts centered exactly on the x,y co-ordinate,
243 * and many layers need to be moved or rotated simply to display the
244 * instrument correctly.
246 * There are three types of transformations:
248 * "x-shift" - move the layer horizontally.
250 * "y-shift" - move the layer vertically.
252 * "rotation" - rotate the layer.
254 * Each transformation may have a fixed offset, and may also have
255 * a floating-point property value to add to the offset. The
256 * floating-point property may be clamped to a minimum and/or
257 * maximum range and scaled (after clamping).
259 * Note that because of the way OpenGL works, transformations will
260 * appear to be applied backwards.
262 static FGPanelTransformation *
263 readTransformation (const SGPropertyNode * node, float w_scale, float h_scale)
265 FGPanelTransformation * t = new FGPanelTransformation;
267 string name = node->getName();
268 string type = node->getStringValue("type");
269 string propName = node->getStringValue("property", "");
270 SGPropertyNode * target = 0;
273 SG_LOG( SG_COCKPIT, SG_ALERT,
274 "No type supplied for transformation " << name
275 << " assuming \"rotation\"" );
279 if (propName != (string)"") {
280 target = fgGetNode(propName, true);
284 t->min = node->getFloatValue("min", -9999999);
285 t->max = node->getFloatValue("max", 99999999);
286 t->factor = node->getFloatValue("scale", 1.0);
287 t->offset = node->getFloatValue("offset", 0.0);
289 // Check for an interpolation table
290 const SGPropertyNode * trans_table = node->getNode("interpolation");
291 if (trans_table != 0) {
292 SG_LOG( SG_COCKPIT, SG_INFO, "Found interpolation table with "
293 << trans_table->nChildren() << "children" );
294 t->table = new SGInterpTable();
295 for(int i = 0; i < trans_table->nChildren(); i++) {
296 const SGPropertyNode * node = trans_table->getChild(i);
297 if (node->getName() == "entry") {
298 double ind = node->getDoubleValue("ind", 0.0);
299 double dep = node->getDoubleValue("dep", 0.0);
300 SG_LOG( SG_COCKPIT, SG_INFO, "Adding interpolation entry "
301 << ind << "==>" << dep );
302 t->table->addEntry(ind, dep);
304 SG_LOG( SG_COCKPIT, SG_INFO, "Skipping " << node->getName()
305 << " in interpolation" );
312 // Move the layer horizontally.
313 if (type == "x-shift") {
314 t->type = FGPanelTransformation::XSHIFT;
315 // t->min *= w_scale; //removed by Martin Dressler
316 // t->max *= w_scale; //removed by Martin Dressler
317 t->offset *= w_scale;
318 t->factor *= w_scale; //Added by Martin Dressler
321 // Move the layer vertically.
322 else if (type == "y-shift") {
323 t->type = FGPanelTransformation::YSHIFT;
324 //t->min *= h_scale; //removed
325 //t->max *= h_scale; //removed
326 t->offset *= h_scale;
327 t->factor *= h_scale; //Added
330 // Rotate the layer. The rotation
331 // is in degrees, and does not need
332 // to scale with the instrument size.
333 else if (type == "rotation") {
334 t->type = FGPanelTransformation::ROTATION;
338 SG_LOG( SG_COCKPIT, SG_ALERT, "Unrecognized transformation type " << type );
343 SG_LOG( SG_COCKPIT, SG_DEBUG, "Read transformation " << name );
349 * Read a chunk of text from the instrument's property list.
351 * A text layer consists of one or more chunks of text. All chunks
352 * share the same font size and color (and eventually, font), but
353 * each can come from a different source. There are three types of
356 * "literal" - a literal text string (the default)
358 * "text-value" - the current value of a string property
360 * "number-value" - the current value of a floating-point property.
362 * All three may also include a printf-style format string.
365 readTextChunk (const SGPropertyNode * node)
367 FGTextLayer::Chunk * chunk;
368 string name = node->getStringValue("name");
369 string type = node->getStringValue("type");
370 string format = node->getStringValue("format");
372 // Default to literal text.
374 SG_LOG( SG_COCKPIT, SG_INFO, "No type provided for text chunk " << name
375 << " assuming \"literal\"");
379 // A literal text string.
380 if (type == "literal") {
381 string text = node->getStringValue("text");
382 chunk = new FGTextLayer::Chunk(text, format);
385 // The value of a string property.
386 else if (type == "text-value") {
387 SGPropertyNode * target =
388 fgGetNode(node->getStringValue("property"), true);
389 chunk = new FGTextLayer::Chunk(FGTextLayer::TEXT_VALUE, target, format);
392 // The value of a float property.
393 else if (type == "number-value") {
394 string propName = node->getStringValue("property");
395 float scale = node->getFloatValue("scale", 1.0);
396 SGPropertyNode * target = fgGetNode(propName, true);
397 chunk = new FGTextLayer::Chunk(FGTextLayer::DOUBLE_VALUE, target,
403 SG_LOG( SG_COCKPIT, SG_ALERT, "Unrecognized type " << type
404 << " for text chunk " << name );
413 * Read a single layer from an instrument's property list.
415 * Each instrument consists of one or more layers stacked on top
416 * of each other; the lower layers show through only where the upper
417 * layers contain an alpha component. Each layer can be moved
418 * horizontally and vertically and rotated using transformations.
420 * This module currently recognizes four kinds of layers:
422 * "texture" - a layer containing a texture (the default)
424 * "text" - a layer containing text
426 * "switch" - a layer that switches between two other layers
427 * based on the current value of a boolean property.
429 * "built-in" - a hard-coded layer supported by C++ code in FlightGear.
431 * Currently, the only built-in layer class is "compass-ribbon".
433 static FGInstrumentLayer *
434 readLayer (const SGPropertyNode * node, float w_scale, float h_scale)
436 FGInstrumentLayer * layer = NULL;
437 string name = node->getStringValue("name");
438 string type = node->getStringValue("type");
439 int w = node->getIntValue("w", -1);
440 int h = node->getIntValue("h", -1);
442 w = int(w * w_scale);
444 h = int(h * h_scale);
448 SG_LOG( SG_COCKPIT, SG_ALERT,
449 "No type supplied for layer " << name
450 << " assuming \"texture\"" );
455 // A textured instrument layer.
456 if (type == "texture") {
457 FGCroppedTexture texture = readTexture(node->getNode("texture"));
458 layer = new FGTexturedLayer(texture, w, h);
462 // A textual instrument layer.
463 else if (type == "text") {
464 FGTextLayer * tlayer = new FGTextLayer(w, h); // FIXME
466 // Set the text color.
467 float red = node->getFloatValue("color/red", 0.0);
468 float green = node->getFloatValue("color/green", 0.0);
469 float blue = node->getFloatValue("color/blue", 0.0);
470 tlayer->setColor(red, green, blue);
472 // Set the point size.
473 float pointSize = node->getFloatValue("point-size", 10.0) * w_scale;
474 tlayer->setPointSize(pointSize);
479 const SGPropertyNode * chunk_group = node->getNode("chunks");
480 if (chunk_group != 0) {
481 int nChunks = chunk_group->nChildren();
482 for (int i = 0; i < nChunks; i++) {
483 const SGPropertyNode * node = chunk_group->getChild(i);
484 if (node->getName() == "chunk") {
485 FGTextLayer::Chunk * chunk = readTextChunk(node);
487 tlayer->addChunk(chunk);
489 SG_LOG( SG_COCKPIT, SG_INFO, "Skipping " << node->getName()
497 // A switch instrument layer.
498 else if (type == "switch") {
499 SGPropertyNode * target =
500 fgGetNode(node->getStringValue("property"), true);
501 FGInstrumentLayer * layer1 =
502 readLayer(node->getNode("layer[0]"), w_scale, h_scale);
503 FGInstrumentLayer * layer2 =
504 readLayer(node->getNode("layer[1]"), w_scale, h_scale);
505 layer = new FGSwitchLayer(w, h, target, layer1, layer2);
508 // A built-in instrument layer.
509 else if (type == "built-in") {
510 string layerclass = node->getStringValue("class");
512 if (layerclass == "mag-ribbon") {
513 layer = new FGMagRibbon(w, h);
516 else if (layerclass == "") {
517 SG_LOG( SG_COCKPIT, SG_ALERT, "No class provided for built-in layer "
523 SG_LOG( SG_COCKPIT, SG_ALERT, "Unknown built-in layer class "
531 SG_LOG( SG_COCKPIT, SG_ALERT, "Unrecognized layer type " << type );
537 // Get the transformations for each layer.
539 const SGPropertyNode * trans_group = node->getNode("transformations");
540 if (trans_group != 0) {
541 int nTransformations = trans_group->nChildren();
542 for (int i = 0; i < nTransformations; i++) {
543 const SGPropertyNode * node = trans_group->getChild(i);
544 if (node->getName() == "transformation") {
545 FGPanelTransformation * t = readTransformation(node, w_scale, h_scale);
547 layer->addTransformation(t);
549 SG_LOG( SG_COCKPIT, SG_INFO, "Skipping " << node->getName()
550 << " in transformations" );
555 SG_LOG( SG_COCKPIT, SG_DEBUG, "Read layer " << name );
561 * Read an instrument from a property list.
563 * The instrument consists of a preferred width and height
564 * (the panel may override these), together with a list of layers
565 * and a list of actions to be performed when the user clicks
566 * the mouse over the instrument. All co-ordinates are relative
567 * to the instrument's position, so instruments are fully relocatable;
568 * likewise, co-ordinates for actions and transformations will be
569 * scaled automatically if the instrument is not at its preferred size.
571 static FGPanelInstrument *
572 readInstrument (const SGPropertyNode * node)
574 const string &name = node->getStringValue("name");
575 int x = node->getIntValue("x", -1);
576 int y = node->getIntValue("y", -1);
577 int real_w = node->getIntValue("w", -1);
578 int real_h = node->getIntValue("h", -1);
579 int w = node->getIntValue("w-base", -1);
580 int h = node->getIntValue("h-base", -1);
582 if (x == -1 || y == -1) {
583 SG_LOG( SG_COCKPIT, SG_ALERT,
584 "x and y positions must be specified and > 0" );
591 w_scale = float(real_w) / float(w);
595 h_scale = float(real_h) / float(h);
599 SG_LOG( SG_COCKPIT, SG_DEBUG, "Reading instrument " << name );
601 FGLayeredInstrument * instrument =
602 new FGLayeredInstrument(x, y, w, h);
605 // Get the actions for the instrument.
607 const SGPropertyNode * action_group = node->getNode("actions");
608 if (action_group != 0) {
609 int nActions = action_group->nChildren();
610 for (int i = 0; i < nActions; i++) {
611 const SGPropertyNode * node = action_group->getChild(i);
612 if (node->getName() == "action") {
613 FGPanelAction * action = readAction(node, w_scale, h_scale);
615 instrument->addAction(action);
617 SG_LOG( SG_COCKPIT, SG_INFO, "Skipping " << node->getName()
624 // Get the layers for the instrument.
626 const SGPropertyNode * layer_group = node->getNode("layers");
627 if (layer_group != 0) {
628 int nLayers = layer_group->nChildren();
629 for (int i = 0; i < nLayers; i++) {
630 const SGPropertyNode * node = layer_group->getChild(i);
631 if (node->getName() == "layer") {
632 FGInstrumentLayer * layer = readLayer(node, w_scale, h_scale);
634 instrument->addLayer(layer);
636 SG_LOG( SG_COCKPIT, SG_INFO, "Skipping " << node->getName()
642 SG_LOG( SG_COCKPIT, SG_DEBUG, "Done reading instrument " << name );
648 * Construct the panel from a property tree.
651 readPanel (const SGPropertyNode * root)
653 SG_LOG( SG_COCKPIT, SG_INFO, "Reading properties for panel " <<
654 root->getStringValue("name", "[Unnamed Panel]") );
656 FGPanel * panel = new FGPanel();
657 panel->setWidth(root->getIntValue("w", 1024));
658 panel->setHeight(root->getIntValue("h", 443));
661 // Grab the visible external viewing area, default to
663 panel->setViewHeight(root->getIntValue("view-height",
664 768 - panel->getHeight() + 2));
667 // Grab the panel's initial offsets, default to 0, 0.
669 if (!fgHasNode("/sim/panel/x-offset"))
670 fgSetInt("/sim/panel/x-offset", root->getIntValue("x-offset", 0));
672 if (!fgHasNode("/sim/panel/y-offset"))
673 fgSetInt("/sim/panel/y-offset", root->getIntValue("y-offset", 0));
676 // Assign the background texture, if any, or a bogus chequerboard.
678 string bgTexture = root->getStringValue("background");
681 panel->setBackground(FGTextureManager::createTexture(bgTexture.c_str()));
682 SG_LOG( SG_COCKPIT, SG_INFO, "Set background texture to " << bgTexture );
686 // Create each instrument.
688 SG_LOG( SG_COCKPIT, SG_INFO, "Reading panel instruments" );
689 const SGPropertyNode * instrument_group = root->getChild("instruments");
690 if (instrument_group != 0) {
691 int nInstruments = instrument_group->nChildren();
692 for (int i = 0; i < nInstruments; i++) {
693 const SGPropertyNode * node = instrument_group->getChild(i);
694 if (node->getName() == "instrument") {
695 FGPanelInstrument * instrument = readInstrument(node);
697 panel->addInstrument(instrument);
699 SG_LOG( SG_COCKPIT, SG_INFO, "Skipping " << node->getName()
700 << " in instruments section" );
704 SG_LOG( SG_COCKPIT, SG_INFO, "Done reading panel instruments" );
708 // Return the new panel.
715 * Read a panel from a property list.
717 * Each panel instrument will appear in its own, separate
718 * property list. The top level simply names the panel and
719 * places the instruments in their appropriate locations (and
720 * optionally resizes them if necessary).
722 * Returns 0 if the read fails for any reason.
725 fgReadPanel (istream &input)
730 readProperties(input, &root);
731 } catch (const sg_exception &e) {
732 guiErrorMessage("Error reading panel: ", e);
735 return readPanel(&root);
740 * Read a panel from a property list.
742 * This function opens a stream to a file, then invokes the
743 * main fgReadPanel() function.
746 fgReadPanel (const string &relative_path)
748 SGPath path(globals->get_fg_root());
749 path.append(relative_path);
753 readProperties(path.str(), &root);
754 } catch (const sg_exception &e) {
755 guiErrorMessage("Error reading panel: ", e);
758 return readPanel(&root);
763 // end of panel_io.cxx