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1 /*
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2 This code accompanies the textbook:
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3
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4 Digital Audio Effects: Theory, Implementation and Application
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5 Joshua D. Reiss and Andrew P. McPherson
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6
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7 ---
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8
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9 Parametric EQ: parametric equaliser adjusting frequency, Q and gain
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10 See textbook Chapter 4: Filter Effects
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11
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12 Code by Andrew McPherson, Brecht De Man and Joshua Reiss
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13
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14 ---
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15
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16 This program is free software: you can redistribute it and/or modify
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17 it under the terms of the GNU General Public License as published by
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18 the Free Software Foundation, either version 3 of the License, or
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19 (at your option) any later version.
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20
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21 This program is distributed in the hope that it will be useful,
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22 but WITHOUT ANY WARRANTY; without even the implied warranty of
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23 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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24 GNU General Public License for more details.
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25
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26 You should have received a copy of the GNU General Public License
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27 along with this program. If not, see <http://www.gnu.org/licenses/>.
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28 */
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29
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30 #include "PluginProcessor.h"
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31 #include "PluginEditor.h"
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32 #include <cstring>
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33
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34 #ifdef _MSC_VER
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35 #define snprintf _snprintf_s //support for pre-2014 versions of Visual Studio
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36 #endif // _MSC_VER
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37
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38 //==============================================================================
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39 ParametricEQAudioProcessorEditor::ParametricEQAudioProcessorEditor (ParametricEQAudioProcessor* ownerFilter)
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40 : AudioProcessorEditor (ownerFilter),
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41 centreFrequencyLabel_("", "Centre frequency (Hz):"),
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42 qLabel_("", "Q:"),
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43 gainDecibelsLabel_("", "Gain (dB):"),
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44 bandwidthLabel_("", "Bandwidth:")
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45 {
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46 // Set up the sliders
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47
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48 addAndMakeVisible(¢reFrequencySlider_);
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49 centreFrequencySlider_.setSliderStyle(Slider::Rotary);
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50 centreFrequencySlider_.addListener(this);
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51 centreFrequencySlider_.setRange(10.0, 20000.0, 0.1);
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52
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53 // Make the centre frequency slider (approximately) logarithmic for a
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54 // more natural feel
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55 centreFrequencySlider_.setSkewFactorFromMidPoint(sqrt(10.0 * 20000.0));
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56
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57 addAndMakeVisible(&qSlider_);
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58 qSlider_.setSliderStyle(Slider::Rotary);
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59 qSlider_.addListener(this);
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60 qSlider_.setRange(0.1, 20.0, 0.01);
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61
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62 addAndMakeVisible(&gainDecibelsSlider_);
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63 gainDecibelsSlider_.setSliderStyle(Slider::Rotary);
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64 gainDecibelsSlider_.addListener(this);
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65 gainDecibelsSlider_.setRange(-12.0, 12.0, 0.1);
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66
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67 // This label is informational and exists apart from other controls
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68 // The other labels are attached to sliders and combo boxes
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69 addAndMakeVisible(&bandwidthLabel_);
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70 bandwidthLabel_.setFont(Font (12.0f));
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71
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72 centreFrequencyLabel_.attachToComponent(¢reFrequencySlider_, false);
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73 centreFrequencyLabel_.setFont(Font (11.0f));
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74
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75 qLabel_.attachToComponent(&qSlider_, false);
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76 qLabel_.setFont(Font (11.0f));
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77
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78 gainDecibelsLabel_.attachToComponent(&gainDecibelsSlider_, false);
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79 gainDecibelsLabel_.setFont(Font (11.0f));
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80
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81 // add the triangular resizer component for the bottom-right of the UI
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82 addAndMakeVisible(resizer_ = new ResizableCornerComponent (this, &resizeLimits_));
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83 resizeLimits_.setSizeLimits(550, 100, 550, 160);
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84
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85 // set our component's initial size to be the last one that was stored in the filter's settings
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86 setSize(ownerFilter->lastUIWidth_,
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87 ownerFilter->lastUIHeight_);
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88
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89 startTimer(50);
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90 }
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91
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92 ParametricEQAudioProcessorEditor::~ParametricEQAudioProcessorEditor()
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93 {
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94 }
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95
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96 //==============================================================================
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97 void ParametricEQAudioProcessorEditor::paint (Graphics& g)
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98 {
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99 g.fillAll (Colours::grey);
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100 }
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101
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102 void ParametricEQAudioProcessorEditor::resized()
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103 {
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104 centreFrequencySlider_.setBounds(20, 20, 150, 40);
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105 qSlider_.setBounds(200, 20, 150, 40);
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106 gainDecibelsSlider_.setBounds(380, 20, 150, 40);
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107 bandwidthLabel_.setBounds(20, 70, 350, 20);
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108
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109 resizer_->setBounds(getWidth() - 16, getHeight() - 16, 16, 16);
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110
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111 getProcessor()->lastUIWidth_ = getWidth();
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112 getProcessor()->lastUIHeight_ = getHeight();
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113 }
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114
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115 //==============================================================================
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116 // This timer periodically checks whether any of the filter's parameters have changed...
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117 void ParametricEQAudioProcessorEditor::timerCallback()
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118 {
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119 ParametricEQAudioProcessor* ourProcessor = getProcessor();
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120
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121 centreFrequencySlider_.setValue(ourProcessor->centreFrequency_, dontSendNotification);
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122 qSlider_.setValue(ourProcessor->q_, dontSendNotification);
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123 gainDecibelsSlider_.setValue(ourProcessor->gainDecibels_, dontSendNotification);
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124 updateBandwidthLabel();
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125 }
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126
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127 // This is our Slider::Listener callback, when the user drags a slider.
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128 void ParametricEQAudioProcessorEditor::sliderValueChanged (Slider* slider)
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129 {
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130 // It's vital to use setParameterNotifyingHost to change any parameters that are automatable
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131 // by the host, rather than just modifying them directly, otherwise the host won't know
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132 // that they've changed.
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133
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134 if (slider == ¢reFrequencySlider_)
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135 {
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136 getProcessor()->setParameterNotifyingHost (ParametricEQAudioProcessor::kCentreFrequencyParam,
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137 (float)centreFrequencySlider_.getValue());
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138 updateBandwidthLabel();
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139 }
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140 else if (slider == &qSlider_)
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141 {
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142 getProcessor()->setParameterNotifyingHost (ParametricEQAudioProcessor::kQParam,
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143 (float)qSlider_.getValue());
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144 updateBandwidthLabel();
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145 }
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146 else if (slider == &gainDecibelsSlider_)
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147 {
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148 getProcessor()->setParameterNotifyingHost (ParametricEQAudioProcessor::kGainDecibelsParam,
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149 (float)gainDecibelsSlider_.getValue());
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150 }
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151 }
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152
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153 void ParametricEQAudioProcessorEditor::updateBandwidthLabel()
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154 {
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155 char str[64];
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156 ParametricEQAudioProcessor* ourProcessor = getProcessor();
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157
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158 snprintf(str, 64, "Bandwidth: %.1f Hz", ourProcessor->centreFrequency_ / ourProcessor->q_);
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159
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160 bandwidthLabel_.setText(str, dontSendNotification);
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161 } |