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1 /*
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2
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3 Copyright (C) 2016 Queen Mary University of London
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4 Author: Fiore Martin
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5
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6 This file is part of Collidoscope.
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7
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8 Collidoscope is free software: you can redistribute it and/or modify
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9 it under the terms of the GNU General Public License as published by
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10 the Free Software Foundation, either version 3 of the License, or
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11 (at your option) any later version.
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12
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13 This program is distributed in the hope that it will be useful,
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14 but WITHOUT ANY WARRANTY; without even the implied warranty of
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15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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16 GNU General Public License for more details.
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17
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18 You should have received a copy of the GNU General Public License
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19 along with this program. If not, see <http://www.gnu.org/licenses/>.
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20 */
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21
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22 #pragma once
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23
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24 #include "cinder/Area.h"
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25
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26 /**
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27 * The DrawInfo class holds size information for drawing the waves in the screen.
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28 * Every time the screen is resized the draw info is updated with the new information about the window size.
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29 *
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30 * Every wave has its own drawInfo.
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31 *
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32 */
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33 class DrawInfo
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34 {
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35 public:
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36
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37 /**
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38 * Constructor. Takes the index of the wave as argument.
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39 */
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40 DrawInfo( size_t waveIndex ):
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41 mWaveIndex( waveIndex ),
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42 mWindowWidth(0),
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43 mWindowHeight(0),
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44 mSelectionBarHeight(0),
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45 mShrinkFactor(1)
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46 {}
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47
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48 /**
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49 * Reset this DrawInfo using the new bounding area for the wave. \a shrinkFactor
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50 * makes the wave shrink on the y axis with respect to the area. A factor 1 makes the wave as big as the area, whereas a factor >1 makes it shrink.
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51 */
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52 void reset( const ci::Area &bounds, float shrinkFactor )
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53 {
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54 mWindowWidth = bounds.getWidth();
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55 mWindowHeight = bounds.getHeight();
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56 mSelectionBarHeight = mWindowHeight / NUM_WAVES;
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57 mShrinkFactor = shrinkFactor;
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58 }
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59
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60 /**
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61 * Maps a value in the audio space [-1.0, 1.0] to a position on the y axis of this DrawInf's bounding area.
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62 *
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63 */
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64 float audioToHeigt(float audioSample) const {
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65 /* clip into range [-1.1] */
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66 if (audioSample < -1.0f) {
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67 audioSample = -1.0f;
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68 }
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69 else if ( audioSample > 1.0f ){
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70 audioSample = 1.0f;
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71 }
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72
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73 /* map from [-1,1] to [0,1] */
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74 float ratio = (audioSample - (-1.0f)) * 0.5f; // 2 = 1 - (-1)
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75
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76 /* get bottom and add the scaled height */
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77 return ratio * mSelectionBarHeight; //remove bounds.getY1() bound only needed for size of tier
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78 }
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79
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80 float getMaxChunkHeight() const
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81 {
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82 return mSelectionBarHeight * mShrinkFactor;
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83 }
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84
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85 float getSelectionBarHeight() const
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86 {
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87 return mSelectionBarHeight;
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88 }
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89
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90 /**
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91 * Returns the center position on the y axis of this DrawInfo's the bounding area.
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92 */
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93 int32_t getWaveCenterY() const
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94 {
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95 if ( mWaveIndex == 0 )
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96 return mWindowHeight * 0.75f + 1;
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97 else
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98 return mWindowHeight / (NUM_WAVES * 2);
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99 }
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100
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101 /**
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102 * Flips y according to the index of the wave. It is needed because the second wave in collidoscope is upside down from the orientation oftthe screen.
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103 */
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104 int flipY(int y) const
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105 {
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106 if ( mWaveIndex == 0)
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107 return mWindowHeight - y;
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108 else
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109 return y;
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110 }
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111
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112 /**
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113 * Returns x. not used at he moment.
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114 *
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115 */
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116 int flipX(int x) const
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117 {
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118 return x;
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119 }
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120
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121
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122 // how much the wave is shrunk on the y axis with respect to the wave's tier
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123 float getShrinkFactor() const
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124 {
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125 return mShrinkFactor;
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126 }
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127
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128 int32_t getWindowWidth() const
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129 {
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130 return mWindowWidth;
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131 }
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132
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133 int32_t getWindowHeight() const
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134 {
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135 return mWindowHeight;
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136 }
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137
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138 /**
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139 * Draw infos cannot be copied and should be passed as const reference.
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140 */
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141 DrawInfo( const DrawInfo &original ) = delete;
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142 DrawInfo & operator=( const DrawInfo &original ) = delete;
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143
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144 private:
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145 const size_t mWaveIndex;
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146
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147 int32_t mWindowHeight;
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148 int32_t mWindowWidth;
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149 int32_t mSelectionBarHeight;
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150
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151 float mShrinkFactor;
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152
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153 };
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