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annotate engine/core/view/camera.h @ 164:5b04a7d3ded6

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typo fix some missing event (de)registrations ability to capture one event multiple times (instead of only having one slot, we have groups and each group has an own slot, the default group is "default" so we are backward compatible
author spq@33b003aa-7bff-0310-803a-e67f0ece8222
date Wed, 15 Oct 2008 14:57:04 +0000
parents 90005975cdbb
children 084004e91d62
rev   line source
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1 /***************************************************************************
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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 * *
46
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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. *
0
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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
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28 // 3rd party library includes
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29
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30 // FIFE includes
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31 // These includes are split up in two parts, separated by one empty line
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32 // First block: files included from the FIFE root src directory
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33 // Second block: files included from the same folder
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34 #include "model/structures/location.h"
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35 #include "util/math/matrix.h"
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36 #include "util/structures/rect.h"
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37
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38 #include "rendererbase.h"
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39
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40 namespace FIFE {
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41
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42 typedef Point3D ScreenPoint;
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43 class Layer;
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44 class Instance;
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45 class ImagePool;
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46 class AnimationPool;
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47 class RenderBackend;
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48 typedef std::map<Layer*, std::vector<Instance*> > t_layer_to_instances;
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49
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50 /** Camera describes properties of a view port shown in the main screen
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51 * Main screen can have multiple cameras active simultanously
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52 * Different cameras can have different properties, like location
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53 * to shoot, zoom or tilt
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54 */
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55 class Camera: public IRendererListener, public IRendererContainer {
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56 public:
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57 /** Constructor
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58 * Camera needs to be added to the view. If not done so, it is not rendered.
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59 * @param id identifier for the camera
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60 * @param layer layer where camera is bind. Camera is bind to a layer for two reasons:
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61 * * camera's scaling is done based on cell image dimensions. Cell image is layer based (@see setCellImageDimensions)
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62 * * camera could be bind to a pather, which operates on layer
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63 * @param viewport used viewport for the camera. Viewport is measured in pixels in relation to game main screen
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64 * @param emc coordinate, where camera is focused on given layer
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65 * @param renderbackend to use with rendering
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66 * @param ipool to use with rendering
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67 * @param apool to use with rendering
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68 */
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69 Camera(const std::string& id,
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70 Layer* layer,
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71 Rect viewport,
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72 ExactModelCoordinate emc,
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73 RenderBackend* renderbackend,
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74 ImagePool* ipool,
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75 AnimationPool* apool);
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76
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77 /** Destructor
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78 */
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79 virtual ~Camera();
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80
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81 /** Gets the identifier for this camera.
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82 */
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83 const std::string& getId() { return m_id; }
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84
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85 /** Sets tilt for the camera.
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86 * e.g. overhead camera has tilt 0, while traditional isometric camera has tilt 45
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87 * @param tilt tilt for the camera
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88 */
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89 void setTilt(double tilt);
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90
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91 /** Gets camera tilt
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92 * @return tilt of camera
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93 */
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94 double getTilt() const;
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95
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96 /** Sets rotation for the camera.
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97 * Rotation can be visualized by thinking camera that rotates around an object
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98 * that it is rendering
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99 * @param rotation rotation for the camera
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100 */
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101 void setRotation(double rotation);
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102
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103 /** Gets camera rotation
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104 * @return rotation of the camera
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105 */
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106 double getRotation() const;
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107
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108 /** Sets zoom for the camera.
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109 * @param zoom zoom for the camera
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110 */
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111 void setZoom(double zoom);
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112
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113 /** Gets camera zoom
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114 * @return zoom of the camera
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115 */
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116 double getZoom() const;
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117
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118 /** Sets screen cell image dimensions.
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119 * Cell image dimension is basically width and height of a bitmap, that covers
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120 * one cell in the layer where camera is bind
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121 * @return Point Point containing x=width and y=height
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122 */
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123 void setCellImageDimensions(unsigned int width, unsigned int height);
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124
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125 /** Gets screen cell image dimensions.
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126 * @see setCellImageDimensions
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127 * @return Point containing x=width and y=height
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128 */
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129 Point getCellImageDimensions();
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130
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131 /** Gets screen cell image dimensions for given layer.
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132 * @return Point Point containing x=width and y=height
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133 */
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134 Point getCellImageDimensions(Layer* layer);
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135
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136 /** Sets the location for camera
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137 * @param location location (center point) to render
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138 */
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139 void setLocation(const Location& location);
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140
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141 /** Gets the location camera is rendering
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142 * @return camera location
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143 */
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144 Location getLocation() const;
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145
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146 /** Gets a reference to the camera location
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147 * @note if you change returned location without calling Camera::setLocation(...),
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148 * remember to call Camera::refresh() (otherwise camera transforms are not updated)
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149 * @return reference to the camera location
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150 */
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151 Location& getLocationRef();
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152
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153 /** Attaches the camera to an instance.
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154 * @param instance Instance to which the camera shall be attached
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155 * @note The camera can only be attached to an instance at the same layer!
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156 */
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157 void attach(Instance *instance);
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158
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159 /** Detaches the camera from an instance.
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160 */
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161 void detach();
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162
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163 /** Returns instance where camera is attached. NULL if not attached
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164 */
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165 bool getAttached() const { return m_attachedto; }
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166
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167 /** Sets the viewport for camera
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168 * viewport is rectangle inside the view where camera renders
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169 * @param viewport area for camera render
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170 */
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171 void setViewPort(const Rect& viewport);
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172
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173 /** Gets the viewport for camera
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174 * @return camera viewport
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175 */
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176 const Rect& getViewPort() const;
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177
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178 /** Transforms given point from screen coordinates to map coordinates
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179 * @param screen_coords screen coordinates to transform
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180 * @param z_calculated if true, z-value (depth cut point) is pre-calculated. If false, camera calculates it
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181 * @return point in map coordinates
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182 */
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183 ExactModelCoordinate toMapCoordinates(ScreenPoint screen_coords, bool z_calculated=true);
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184
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185 /** Transforms given point from map coordinates to screen coordinates
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186 * @return point in screen coordinates
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187 */
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188 ScreenPoint toScreenCoordinates(ExactModelCoordinate map_coords);
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189
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190 /** Sets camera enabled / disabled
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191 */
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192 void setEnabled(bool enabled);
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193
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194 /** Gets if camera is enabled / disabled
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195 */
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196 bool isEnabled();
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197
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198 /** Gets angle of vector defined by given locations and camera properties (e.g. rotation)
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199 * @return angle in polar coordinates
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200 */
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201 inline int getAngleBetween(const Location& loc1, const Location& loc2) {
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202 static const double VECTOR_MULTIP = 100000.0;
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203 ExactModelCoordinate c1 = loc1.getMapCoordinates();
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204 ExactModelCoordinate c2 = loc2.getMapCoordinates();
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205 ExactModelCoordinate cd((c2.x - c1.x) * VECTOR_MULTIP, (c2.y - c1.y) * VECTOR_MULTIP, 0);
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206 c2.x = c1.x + cd.x;
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207 c2.y = c1.y + cd.y;
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208 ScreenPoint pt1 = this->toScreenCoordinates(c1);
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209 ScreenPoint pt2 = this->toScreenCoordinates(c2);
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210 double dy = (pt2.y - pt1.y);
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211 double dx = (pt2.x - pt1.x);
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212 int angle = static_cast<int>(atan2(-dy,dx)*(180.0/M_PI));
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213 return angle;
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214 }
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215
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216 /** Returns instances that match given screen coordinate
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217 * @param screen_coords screen coordinates to be used for hit search
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218 * @param layer layer to use for search
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219 * @param instances list of instances that is filled based on hit test results
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220 */
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221 void getMatchingInstances(ScreenPoint screen_coords, Layer& layer, std::list<Instance*>& instances);
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222
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223 /** Returns instances that match given screen coordinate
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224 * @param screen_point1 top left screen coordinates to be used for hit search
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225 * @param screen_point2 right bottom screen coordinates to be used for hit search
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226 * @param layer layer to use for search
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227 * @param instances list of instances that is filled based on hit test results
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228 */
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229 void getMatchingInstances(Rect screen_rect, Layer& layer, std::list<Instance*>& instances);
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230
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231 /** Returns instances that match given location. Instances are sorted based on camera view, so that "topmost"
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232 * instance is first in returned list
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233 * @param loc location where to fetch instances from
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234 * @param instances list of instances that is filled based on hit test results
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235 * @param use_exactcoordinates if true, comparison is done using exact coordinates. if not, cell coordinates are used
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236 */
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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237 void getMatchingInstances(Location& loc, std::list<Instance*>& instances, bool use_exactcoordinates=false);
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238
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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239 /** General update routine.
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240 * In this function, the camera's position gets updated when its attached
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241 * to another instance.
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242 * @note call this only once in engine update cycle, so that tracking between
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243 * current position and previous position keeps in sync. This information
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244 * is used e.g. by view to fix the pixel wobbling problem
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245 */
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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246 void update();
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247
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248 /** Refreshes camera view in case e.g. location is updated directly (not via setLocation)
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249 * @note calling this function marks camera as "warped", therefore it causes all instance
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250 * positions to be recalculated. If you constantly call this, you end up with pixel wobbling
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251 * effect when camera is moved.
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252 */
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253 void refresh();
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254
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255 /** Returns latest camera movement in screen coordinates (dx, dy)
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256 */
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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257 inline ScreenPoint getLatestMovement() {
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258 return m_prev_origo - m_cur_origo;
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259 }
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260
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261 /** Resets temporary values from last update round, like warped flag
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262 */
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263 void resetUpdates();
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264
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265 /** Adds new renderer on the view. Ownership is transferred to the camera.
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266 */
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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267 void addRenderer(RendererBase* renderer);
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268
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269 /** Gets renderer with given name
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270 */
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271 RendererBase* getRenderer(const std::string& name);
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272
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273 /** resets active layer information on all renderers.
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274 */
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275 void resetRenderers();
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276
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277 /** calculates z-value for given screenpoint
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278 */
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279 void calculateZValue(ScreenPoint& screen_coords);
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280
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281 void onRendererPipelinePositionChanged(RendererBase* renderer);
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282 void onRendererEnabledChanged(RendererBase* renderer);
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283
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284 /** Renders camera
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285 */
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286 void render();
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287
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288 private:
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289 std::string m_id;
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290
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291 /** Updates the camera transformation matrix T with requested values.
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292 * The requests are done using these functions :
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293 * - setLocation
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294 * - setRotation
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295 * - setTilt
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296 */
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297 void updateMatrices();
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298
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299 /** Updates camera reference scale
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300 * Reference scale is in a sense an internal zooming factor,
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301 * which adjusts cell dimensions in logical space to ones shown on
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302 * screen. Calculation is based on current camera properties (e.g. rotation)
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303 * + given cell image dimensions for camera's layer
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304 */
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305 void updateReferenceScale();
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306
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307 /** Gets logical cell image dimensions for given layer
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308 */
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309 DoublePoint getLogicalCellDimensions(Layer* layer);
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310
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311 DoubleMatrix m_matrix;
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312 DoubleMatrix m_inverse_matrix;
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313 double m_tilt;
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314 double m_rotation;
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315 double m_zoom;
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316 Location m_location;
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317 ScreenPoint m_prev_origo;
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318 ScreenPoint m_cur_origo;
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319 Rect m_viewport;
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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320 bool m_view_updated;
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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321 unsigned int m_screen_cell_width;
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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322 unsigned int m_screen_cell_height;
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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323 double m_reference_scale;
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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324 bool m_enabled;
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325 Instance* m_attachedto;
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326 // caches calculated image dimensions for already queried & calculated layers
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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327 std::map<Layer*, Point> m_image_dimensions;
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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328 bool m_iswarped;
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329
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330 // list of renderers managed by the view
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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331 std::map<std::string, RendererBase*> m_renderers;
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332 std::list<RendererBase*> m_pipeline;
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333 bool m_updated; // false, if view has never been updated before
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
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334
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335 RenderBackend* m_renderbackend;
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
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336 ImagePool* m_ipool;
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
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337 AnimationPool* m_apool;
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
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338
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
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339 // caches layer -> instances structure between renders e.g. to fast query of mouse picking order
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340 t_layer_to_instances m_layer_to_instances;
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
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341 };
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342 }
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
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343 #endif