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annotate engine/core/view/camera.h @ 18:40a7c9618ade

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* new function which lists instances in a rect
author spq@33b003aa-7bff-0310-803a-e67f0ece8222
date Mon, 07 Jul 2008 01:40:57 +0000
parents 4a0efb7baf70
children 90005975cdbb
rev   line source
0
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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 * *
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6 * FIFE is free software; you can redistribute it and/or modify *
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7 * it under the terms of the GNU General Public License as published by *
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8 * the Free Software Foundation; either version 2 of the License, or *
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9 * (at your option) any later version. *
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10 * *
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11 * This program 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 *
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14 * GNU 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 General Public License *
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17 * along with this program; if not, write to the *
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18 * Free Software Foundation, Inc., *
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19 * 51 Franklin St, 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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237 void getMatchingInstances(Location& loc, std::list<Instance*>& instances, bool use_exactcoordinates=false);
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238
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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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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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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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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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320 bool m_view_updated;
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321 unsigned int m_screen_cell_width;
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322 unsigned int m_screen_cell_height;
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323 double m_reference_scale;
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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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327 std::map<Layer*, Point> m_image_dimensions;
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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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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
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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;
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337 AnimationPool* m_apool;
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338
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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 }
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343 #endif