PEGASUS: Implement two of the primitive-based DisplayElements

1 files changed, 241 insertions, 0 deletions

diff --git a/engines/pegasus/elements.cpp b/engines/pegasus/elements.cpp
new file mode 100644
index 0000000000..132c19a02a
--- /dev/null
+++ b/engines/pegasus/elements.cpp
@@ -0,0 +1,241 @@
+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * Additional copyright for this file:
+ * Copyright (C) 1995-1997 Presto Studios, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+#include "pegasus/elements.h"
+#include "pegasus/graphics.h"
+
+namespace Pegasus {
+
+DisplayElement::DisplayElement(const tDisplayElementID id) : IDObject(id) {
+	_elementIsDisplaying = false;
+	_elementIsVisible = false;
+	_elementOrder = 0;
+	_triggeredElement = this;
+	_nextElement = 0;
+}
+
+DisplayElement::~DisplayElement() {
+	if (isDisplaying())
+		((PegasusEngine *)g_engine)->_gfx->removeDisplayElement(this);
+}
+
+void DisplayElement::setDisplayOrder(const tDisplayOrder order) {
+	if (_elementOrder != order) {
+		_elementOrder = order;
+		if (isDisplaying()) {
+			((PegasusEngine *)g_engine)->_gfx->removeDisplayElement(this);
+			((PegasusEngine *)g_engine)->_gfx->addDisplayElement(this);
+			triggerRedraw();
+		}
+	}
+}
+
+void DisplayElement::startDisplaying() {
+	if (!isDisplaying()) {
+		((PegasusEngine *)g_engine)->_gfx->addDisplayElement(this);
+		triggerRedraw();
+	}
+}
+
+void DisplayElement::stopDisplaying() {
+	if (isDisplaying()) {
+		triggerRedraw();
+		((PegasusEngine *)g_engine)->_gfx->removeDisplayElement(this);
+	}
+}
+
+void DisplayElement::setBounds(const tCoordType left, const tCoordType top, const tCoordType right, const tCoordType bottom) {
+	_bounds = Common::Rect(left, top, right, bottom);
+}
+
+void DisplayElement::getBounds(Common::Rect &r) const {
+	r = _bounds;
+}
+
+void DisplayElement::sizeElement(const tCoordType h, const tCoordType v) {
+	_bounds.right = _bounds.left + h;
+	_bounds.bottom = _bounds.top + v;
+}
+
+void DisplayElement::moveElementTo(const tCoordType h, const tCoordType v) {
+	_bounds.moveTo(h, v);
+}
+
+void DisplayElement::moveElement(const tCoordType dh, const tCoordType dv) {
+	_bounds.translate(dh, dv);
+}
+
+void DisplayElement::getLocation(tCoordType &h, tCoordType &v) const {
+	h = _bounds.left;
+	v = _bounds.top;
+}
+
+void DisplayElement::centerElementAt(const tCoordType h, const tCoordType v) {
+	_bounds.moveTo(h - (_bounds.width() / 2), v - (_bounds.height() / 2));
+}
+
+void DisplayElement::getCenter(tCoordType &h, tCoordType &v) const {
+	h = (_bounds.left + _bounds.right) / 2;
+	v = (_bounds.top + _bounds.bottom) / 2;
+}
+
+void DisplayElement::setBounds(const Common::Rect &r) {
+	if (r != _bounds) {
+		triggerRedraw();
+		_bounds = r;
+		triggerRedraw();
+	}
+}
+
+void DisplayElement::hide() {
+	if (_elementIsVisible) {
+		triggerRedraw();
+		_elementIsVisible = false;
+	}
+}
+
+void DisplayElement::show() {
+	if (!_elementIsVisible) {
+		_elementIsVisible = true;
+		triggerRedraw();
+	}
+}
+
+//	Only invalidates this element's bounding rectangle if all these conditions are true:
+//	--	The triggered element is this element.
+//	--	The element is displaying on the display list.
+//	--	The element is visible.
+//	--	The element is part of the active layer OR is one of the reserved items.
+void DisplayElement::triggerRedraw() {
+	GraphicsManager *gfx = ((PegasusEngine *)g_engine)->_gfx;
+
+	if (_triggeredElement == this) {
+		if (validToDraw(gfx->getBackOfActiveLayer(), gfx->getFrontOfActiveLayer()))
+			gfx->invalRect(_bounds);
+	} else {
+		_triggeredElement->triggerRedraw();
+	}
+}
+
+void DisplayElement::setTriggeredElement(DisplayElement *element) {
+	if (element)
+		_triggeredElement = element;
+	else
+		_triggeredElement = this;
+}
+
+bool DisplayElement::validToDraw(tDisplayOrder backLayer, tDisplayOrder frontLayer) {
+	return	isDisplaying() && _elementIsVisible &&
+			(getObjectID() <= kHighestReservedElementID ||
+			(getDisplayOrder() >= backLayer &&
+			getDisplayOrder() <= frontLayer));
+}
+
+DropHighlight::DropHighlight(const tDisplayElementID id) : DisplayElement(id) {
+	_highlightColor = g_system->getScreenFormat().RGBToColor(0x48, 0x80, 0xD8);
+	_thickness = 2;
+	_cornerDiameter = 0;
+}
+
+void DropHighlight::draw(const Common::Rect &) {
+	Graphics::Surface *screen = g_system->lockScreen();
+
+	// Since this is only used in two different ways, I'm only
+	// going to implement it in those two ways. Deal with it.
+
+	Common::Rect rect = _bounds;
+	screen->frameRect(rect, _highlightColor);
+	rect.grow(1);
+	screen->frameRect(rect, _highlightColor);
+
+	if (_cornerDiameter == 8 && _thickness == 4) {
+		rect.grow(1);
+		screen->frameRect(rect, _highlightColor);
+		screen->hLine(rect.left + 1, rect.top - 1, rect.right - 2, _highlightColor);
+		screen->hLine(rect.left + 1, rect.bottom, rect.right - 2, _highlightColor);
+		screen->vLine(rect.left - 1, rect.top + 1, rect.bottom - 2, _highlightColor);
+		screen->vLine(rect.right, rect.top + 1, rect.bottom - 2, _highlightColor);
+	}
+
+	g_system->unlockScreen();
+}
+
+EnergyBar::EnergyBar(const tDisplayElementID id) : DisplayElement(id) {
+	_maxEnergy = 0;
+	_energyLevel = 0;
+	_barColor = 0;
+}
+
+void EnergyBar::checkRedraw() {	
+	if (_elementIsVisible) {
+		Common::Rect r;
+		calcLevelRect(r);
+		if (r != _levelRect)
+			triggerRedraw();
+	}
+}
+
+void EnergyBar::setEnergyLevel(const uint32 newLevel) {
+	if (_energyLevel != newLevel) {
+		_energyLevel = newLevel;
+		checkRedraw();
+	}
+}
+
+void EnergyBar::setMaxEnergy(const uint32 newMax) {
+	if (_maxEnergy != newMax) {
+		if (_energyLevel > newMax)
+			_energyLevel = newMax;
+		_maxEnergy = newMax;
+		checkRedraw();
+	}
+}
+
+void EnergyBar::setBounds(const Common::Rect &r) {
+	DisplayElement::setBounds(r);
+	checkRedraw();
+}
+
+void EnergyBar::draw(const Common::Rect &r) {
+	Common::Rect levelRect;
+	calcLevelRect(levelRect);
+
+	if (r.intersects(levelRect)) {
+		Graphics::Surface *screen = g_system->lockScreen();
+		screen->fillRect(levelRect, _barColor);
+		g_system->lockScreen();
+	}
+}
+
+void EnergyBar::calcLevelRect(Common::Rect &r) const {
+	if (_maxEnergy > 0) {
+		r = _bounds;
+		r.left = r.right - _bounds.width() * _energyLevel / _maxEnergy;
+	} else {
+		r = Common::Rect(0, 0, 0, 0);
+	}
+}
+
+} // End of namespace Pegasus