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annotate engine/core/view/camera.h @ 238:d76169461729

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Removed HelpText from C++. Moved helptext to base widget. Now all widgets may have a helptext.
author phoku@33b003aa-7bff-0310-803a-e67f0ece8222
date Tue, 24 Mar 2009 16:06:02 +0000
parents 44919eb74c40
children ed1565a5a2a0
rev   line source
0
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1 /***************************************************************************
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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2 * Copyright (C) 2005-2008 by the FIFE team *
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3 * http://www.fifengine.de *
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4 * This file is part of FIFE. *
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5 * *
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90005975cdbb * Final LGPL switch step by adjusting the file headers
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6 * FIFE is free software; you can redistribute it and/or *
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7 * modify it under the terms of the GNU Lesser General Public *
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8 * License as published by the Free Software Foundation; either *
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9 * version 2.1 of the License, or (at your option) any later version. *
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10 * *
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11 * This library is distributed in the hope that it will be useful, *
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12 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
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13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
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14 * Lesser General Public License for more details. *
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15 * *
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16 * You should have received a copy of the GNU Lesser General Public *
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17 * License along with this library; if not, write to the *
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18 * Free Software Foundation, Inc., *
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19 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA *
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20 ***************************************************************************/
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21
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22 #ifndef FIFE_VIEW_CAMERA_H
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23 #define FIFE_VIEW_CAMERA_H
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24
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25 // Standard C++ library includes
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26 #include <string>
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27 #include <map>
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28
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29 // 3rd party library includes
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30
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31 // FIFE includes
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32 // These includes are split up in two parts, separated by one empty line
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33 // First block: files included from the FIFE root src directory
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34 // Second block: files included from the same folder
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35 #include "model/structures/location.h"
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36 #include "util/math/matrix.h"
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37 #include "util/structures/rect.h"
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38
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39 #include "rendererbase.h"
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40
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41 namespace FIFE {
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42
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43 typedef Point3D ScreenPoint;
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44 class Layer;
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45 class Instance;
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46 class ImagePool;
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47 class AnimationPool;
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48 class RenderBackend;
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49 typedef std::map<Layer*, std::vector<Instance*> > t_layer_to_instances;
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50
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51 /** Camera describes properties of a view port shown in the main screen
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52 * Main screen can have multiple cameras active simultanously
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53 * Different cameras can have different properties, like location
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54 * to shoot, zoom or tilt
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55 */
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56 class Camera: public IRendererListener, public IRendererContainer {
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57 public:
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58 /** Constructor
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59 * Camera needs to be added to the view. If not done so, it is not rendered.
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60 * @param id identifier for the camera
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61 * @param layer layer where camera is bind. Camera is bind to a layer for two reasons:
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62 * * camera's scaling is done based on cell image dimensions. Cell image is layer based (@see setCellImageDimensions)
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63 * * camera could be bind to a pather, which operates on layer
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64 * @param viewport used viewport for the camera. Viewport is measured in pixels in relation to game main screen
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65 * @param emc coordinate, where camera is focused on given layer
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66 * @param renderbackend to use with rendering
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67 * @param ipool to use with rendering
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68 * @param apool to use with rendering
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69 */
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70 Camera(const std::string& id,
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71 Layer* layer,
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72 Rect viewport,
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73 ExactModelCoordinate emc,
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74 RenderBackend* renderbackend,
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75 ImagePool* ipool,
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76 AnimationPool* apool);
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77
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78 /** Destructor
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79 */
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80 virtual ~Camera();
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81
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82 /** Gets the identifier for this camera.
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83 */
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84 const std::string& getId() { return m_id; }
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85
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86 /** Sets tilt for the camera.
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87 * e.g. overhead camera has tilt 0, while traditional isometric camera has tilt 45
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88 * @param tilt tilt for the camera
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89 */
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90 void setTilt(double tilt);
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91
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92 /** Gets camera tilt
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93 * @return tilt of camera
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94 */
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95 double getTilt() const;
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96
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97 /** Sets rotation for the camera.
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98 * Rotation can be visualized by thinking camera that rotates around an object
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99 * that it is rendering
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100 * @param rotation rotation for the camera
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101 */
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102 void setRotation(double rotation);
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103
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104 /** Gets camera rotation
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105 * @return rotation of the camera
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106 */
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107 double getRotation() const;
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108
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109 /** Sets zoom for the camera.
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110 * @param zoom zoom for the camera
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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111 */
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
112 void setZoom(double zoom);
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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113
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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114 /** Gets camera zoom
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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115 * @return zoom of the camera
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116 */
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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117 double getZoom() const;
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118
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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119 /** Sets screen cell image dimensions.
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120 * Cell image dimension is basically width and height of a bitmap, that covers
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121 * one cell in the layer where camera is bind
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122 * @return Point Point containing x=width and y=height
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123 */
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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124 void setCellImageDimensions(unsigned int width, unsigned int height);
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125
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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126 /** Gets screen cell image dimensions.
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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127 * @see setCellImageDimensions
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128 * @return Point containing x=width and y=height
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129 */
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130 Point getCellImageDimensions();
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131
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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132 /** Gets screen cell image dimensions for given layer.
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133 * @return Point Point containing x=width and y=height
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134 */
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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135 Point getCellImageDimensions(Layer* layer);
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136
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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137 /** Sets the location for camera
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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138 * @param location location (center point) to render
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139 */
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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140 void setLocation(const Location& location);
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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141
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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142 /** Gets the location camera is rendering
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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143 * @return camera location
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144 */
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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145 Location getLocation() const;
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146
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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147 /** Gets a reference to the camera location
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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148 * @note if you change returned location without calling Camera::setLocation(...),
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149 * remember to call Camera::refresh() (otherwise camera transforms are not updated)
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150 * @return reference to the camera location
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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151 */
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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152 Location& getLocationRef();
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153
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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154 /** Attaches the camera to an instance.
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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155 * @param instance Instance to which the camera shall be attached
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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156 * @note The camera can only be attached to an instance at the same layer!
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157 */
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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158 void attach(Instance *instance);
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159
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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160 /** Detaches the camera from an instance.
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161 */
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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162 void detach();
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163
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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164 /** Returns instance where camera is attached. NULL if not attached
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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165 */
200
084004e91d62 the function getAttached() in FIFE::Camera was returning a FIFE::Instance* but the function return value was a bool. Changed the function so now its prototype is correct.
vtchill@33b003aa-7bff-0310-803a-e67f0ece8222
parents: 46
diff changeset
166 Instance* getAttached() const { return m_attachedto; }
0
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167
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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168 /** Sets the viewport for camera
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169 * viewport is rectangle inside the view where camera renders
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170 * @param viewport area for camera render
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171 */
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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172 void setViewPort(const Rect& viewport);
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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173
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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174 /** Gets the viewport for camera
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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175 * @return camera viewport
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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176 */
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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177 const Rect& getViewPort() const;
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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178
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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179 /** Transforms given point from screen coordinates to map coordinates
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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180 * @param screen_coords screen coordinates to transform
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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181 * @param z_calculated if true, z-value (depth cut point) is pre-calculated. If false, camera calculates it
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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182 * @return point in map coordinates
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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183 */
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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184 ExactModelCoordinate toMapCoordinates(ScreenPoint screen_coords, bool z_calculated=true);
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185
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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186 /** Transforms given point from map coordinates to screen coordinates
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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187 * @return point in screen coordinates
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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188 */
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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189 ScreenPoint toScreenCoordinates(ExactModelCoordinate map_coords);
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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190
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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191 /** Sets camera enabled / disabled
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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192 */
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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193 void setEnabled(bool enabled);
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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194
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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195 /** Gets if camera is enabled / disabled
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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196 */
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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197 bool isEnabled();
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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198
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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199 /** Gets angle of vector defined by given locations and camera properties (e.g. rotation)
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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200 * @return angle in polar coordinates
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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201 */
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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202 inline int getAngleBetween(const Location& loc1, const Location& loc2) {
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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203 static const double VECTOR_MULTIP = 100000.0;
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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204 ExactModelCoordinate c1 = loc1.getMapCoordinates();
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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205 ExactModelCoordinate c2 = loc2.getMapCoordinates();
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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206 ExactModelCoordinate cd((c2.x - c1.x) * VECTOR_MULTIP, (c2.y - c1.y) * VECTOR_MULTIP, 0);
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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207 c2.x = c1.x + cd.x;
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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208 c2.y = c1.y + cd.y;
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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209 ScreenPoint pt1 = this->toScreenCoordinates(c1);
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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210 ScreenPoint pt2 = this->toScreenCoordinates(c2);
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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211 double dy = (pt2.y - pt1.y);
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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212 double dx = (pt2.x - pt1.x);
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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213 int angle = static_cast<int>(atan2(-dy,dx)*(180.0/M_PI));
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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214 return angle;
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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215 }
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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216
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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217 /** Returns instances that match given screen coordinate
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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218 * @param screen_coords screen coordinates to be used for hit search
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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219 * @param layer layer to use for search
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220 * @param instances list of instances that is filled based on hit test results
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221 */
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222 void getMatchingInstances(ScreenPoint screen_coords, Layer& layer, std::list<Instance*>& instances);
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223
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224 /** Returns instances that match given screen coordinate
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225 * @param screen_point1 top left screen coordinates to be used for hit search
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226 * @param screen_point2 right bottom screen coordinates to be used for hit search
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227 * @param layer layer to use for search
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228 * @param instances list of instances that is filled based on hit test results
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229 */
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230 void getMatchingInstances(Rect screen_rect, Layer& layer, std::list<Instance*>& instances);
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231
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232 /** Returns instances that match given location. Instances are sorted based on camera view, so that "topmost"
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233 * instance is first in returned list
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234 * @param loc location where to fetch instances from
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235 * @param instances list of instances that is filled based on hit test results
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236 * @param use_exactcoordinates if true, comparison is done using exact coordinates. if not, cell coordinates are used
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237 */
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238 void getMatchingInstances(Location& loc, std::list<Instance*>& instances, bool use_exactcoordinates=false);
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239
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240 /** General update routine.
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241 * In this function, the camera's position gets updated when its attached
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242 * to another instance.
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243 * @note call this only once in engine update cycle, so that tracking between
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244 * current position and previous position keeps in sync. This information
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245 * is used e.g. by view to fix the pixel wobbling problem
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246 */
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247 void update();
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248
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249 /** Refreshes camera view in case e.g. location is updated directly (not via setLocation)
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250 * @note calling this function marks camera as "warped", therefore it causes all instance
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251 * positions to be recalculated. If you constantly call this, you end up with pixel wobbling
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252 * effect when camera is moved.
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253 */
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254 void refresh();
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255
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256 /** Returns latest camera movement in screen coordinates (dx, dy)
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257 */
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258 inline ScreenPoint getLatestMovement() {
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259 return m_prev_origo - m_cur_origo;
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260 }
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261
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262 /** Resets temporary values from last update round, like warped flag
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263 */
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264 void resetUpdates();
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265
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266 /** Adds new renderer on the view. Ownership is transferred to the camera.
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267 */
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268 void addRenderer(RendererBase* renderer);
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269
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270 /** Gets renderer with given name
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271 */
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272 RendererBase* getRenderer(const std::string& name);
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273
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274 /** resets active layer information on all renderers.
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275 */
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276 void resetRenderers();
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277
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278 /** calculates z-value for given screenpoint
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279 */
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280 void calculateZValue(ScreenPoint& screen_coords);
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281
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282 void onRendererPipelinePositionChanged(RendererBase* renderer);
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283 void onRendererEnabledChanged(RendererBase* renderer);
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284
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285 /** Renders camera
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286 */
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287 void render();
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288
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289 private:
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290 std::string m_id;
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291
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292 /** Updates the camera transformation matrix T with requested values.
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293 * The requests are done using these functions :
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294 * - setLocation
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295 * - setRotation
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296 * - setTilt
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297 */
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298 void updateMatrices();
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299
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300 /** Updates camera reference scale
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301 * Reference scale is in a sense an internal zooming factor,
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302 * which adjusts cell dimensions in logical space to ones shown on
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303 * screen. Calculation is based on current camera properties (e.g. rotation)
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304 * + given cell image dimensions for camera's layer
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305 */
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306 void updateReferenceScale();
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307
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308 /** Gets logical cell image dimensions for given layer
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309 */
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310 DoublePoint getLogicalCellDimensions(Layer* layer);
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311
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312 DoubleMatrix m_matrix;
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313 DoubleMatrix m_inverse_matrix;
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314 double m_tilt;
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315 double m_rotation;
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316 double m_zoom;
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317 Location m_location;
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318 ScreenPoint m_prev_origo;
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319 ScreenPoint m_cur_origo;
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320 Rect m_viewport;
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321 bool m_view_updated;
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322 unsigned int m_screen_cell_width;
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323 unsigned int m_screen_cell_height;
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324 double m_reference_scale;
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325 bool m_enabled;
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326 Instance* m_attachedto;
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327 // caches calculated image dimensions for already queried & calculated layers
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328 std::map<Layer*, Point> m_image_dimensions;
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329 bool m_iswarped;
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330
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331 // list of renderers managed by the view
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332 std::map<std::string, RendererBase*> m_renderers;
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333 std::list<RendererBase*> m_pipeline;
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334 bool m_updated; // false, if view has never been updated before
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335
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336 RenderBackend* m_renderbackend;
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
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337 ImagePool* m_ipool;
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
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338 AnimationPool* m_apool;
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339
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340 // caches layer -> instances structure between renders e.g. to fast query of mouse picking order
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341 t_layer_to_instances m_layer_to_instances;
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342 };
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343 }
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344 #endif