annotate layer/LogNumericalScale.cpp @ 983:04337eb34f23 osx-retina

Render LED button direct to widget, making it look OK on retina screen
author Chris Cannam
date Tue, 30 Jun 2015 15:00:23 +0100
parents 4fe7a09be0fe
children 5144d7185fb5
rev   line source
Chris@696 1 /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
Chris@696 2
Chris@696 3 /*
Chris@696 4 Sonic Visualiser
Chris@696 5 An audio file viewer and annotation editor.
Chris@696 6 Centre for Digital Music, Queen Mary, University of London.
Chris@696 7 This file copyright 2006-2013 Chris Cannam and QMUL.
Chris@696 8
Chris@696 9 This program is free software; you can redistribute it and/or
Chris@696 10 modify it under the terms of the GNU General Public License as
Chris@696 11 published by the Free Software Foundation; either version 2 of the
Chris@696 12 License, or (at your option) any later version. See the file
Chris@696 13 COPYING included with this distribution for more information.
Chris@696 14 */
Chris@696 15
Chris@696 16 #include "LogNumericalScale.h"
Chris@696 17 #include "VerticalScaleLayer.h"
Chris@696 18
Chris@696 19 #include "base/LogRange.h"
Chris@696 20
Chris@696 21 #include <QPainter>
Chris@696 22
Chris@696 23 #include <cmath>
Chris@696 24
Chris@696 25 #include "view/View.h"
Chris@696 26
Chris@696 27 //#define DEBUG_TIME_VALUE_LAYER 1
Chris@696 28
Chris@696 29 int
Chris@918 30 LogNumericalScale::getWidth(LayerGeometryProvider *,
Chris@696 31 QPainter &paint)
Chris@696 32 {
Chris@699 33 return paint.fontMetrics().width("-000.00") + 10;
Chris@696 34 }
Chris@696 35
Chris@696 36 void
Chris@918 37 LogNumericalScale::paintVertical(LayerGeometryProvider *v,
Chris@696 38 const VerticalScaleLayer *layer,
Chris@696 39 QPainter &paint,
Chris@696 40 int x0,
Chris@904 41 double minlog,
Chris@904 42 double maxlog)
Chris@696 43 {
Chris@696 44 int w = getWidth(v, paint) + x0;
Chris@696 45
Chris@696 46 int n = 10;
Chris@696 47
Chris@904 48 double val = minlog;
Chris@904 49 double inc = (maxlog - val) / n; // even increments of log scale
Chris@696 50
Chris@696 51 // smallest increment as displayed
Chris@904 52 double minDispInc = LogRange::unmap(minlog + inc) - LogRange::unmap(minlog);
Chris@696 53
Chris@696 54 #ifdef DEBUG_TIME_VALUE_LAYER
Chris@696 55 cerr << "min = " << minlog << ", max = " << maxlog << ", inc = " << inc << ", minDispInc = " << minDispInc << endl;
Chris@696 56 #endif
Chris@696 57
Chris@864 58 const int buflen = 40;
Chris@864 59 char buffer[buflen];
Chris@696 60
Chris@904 61 double round = 1.f;
Chris@696 62 int dp = 0;
Chris@696 63
Chris@696 64 if (minDispInc > 0) {
Chris@905 65 int prec = int(trunc(log10(minDispInc)));
Chris@696 66 if (prec < 0) dp = -prec;
Chris@905 67 round = pow(10.0, prec);
Chris@704 68 if (dp > 4) dp = 4;
Chris@696 69 #ifdef DEBUG_TIME_VALUE_LAYER
Chris@696 70 cerr << "round = " << round << ", prec = " << prec << ", dp = " << dp << endl;
Chris@696 71 #endif
Chris@696 72 }
Chris@696 73
Chris@696 74 int prevy = -1;
Chris@696 75
Chris@696 76 for (int i = 0; i < n; ++i) {
Chris@696 77
Chris@696 78 int y, ty;
Chris@696 79 bool drawText = true;
Chris@696 80
Chris@696 81 if (i == n-1 &&
Chris@918 82 v->getPaintHeight() < paint.fontMetrics().height() * (n*2)) {
Chris@696 83 if (layer->getScaleUnits() != "") drawText = false;
Chris@696 84 }
Chris@696 85
Chris@904 86 double dispval = LogRange::unmap(val);
Chris@696 87 dispval = floor(dispval / round) * round;
Chris@696 88
Chris@696 89 #ifdef DEBUG_TIME_VALUE_LAYER
Chris@696 90 cerr << "val = " << val << ", dispval = " << dispval << endl;
Chris@696 91 #endif
Chris@696 92
Chris@696 93 y = layer->getYForValue(v, dispval);
Chris@696 94
Chris@696 95 ty = y - paint.fontMetrics().height() + paint.fontMetrics().ascent() + 2;
Chris@696 96
Chris@696 97 if (prevy >= 0 && (prevy - y) < paint.fontMetrics().height()) {
Chris@696 98 val += inc;
Chris@696 99 continue;
Chris@696 100 }
Chris@696 101
Chris@905 102 int digits = int(trunc(log10(dispval)));
Chris@696 103 int sf = dp + (digits > 0 ? digits : 0);
Chris@696 104 if (sf < 4) sf = 4;
Chris@704 105 #ifdef DEBUG_TIME_VALUE_LAYER
Chris@704 106 cerr << "sf = " << sf << endl;
Chris@704 107 #endif
Chris@864 108 snprintf(buffer, buflen, "%.*g", sf, dispval);
Chris@696 109
Chris@696 110 QString label = QString(buffer);
Chris@696 111
Chris@696 112 paint.drawLine(w - 5, y, w, y);
Chris@696 113
Chris@696 114 if (drawText) {
Chris@696 115 paint.drawText(w - paint.fontMetrics().width(label) - 6,
Chris@696 116 ty, label);
Chris@696 117 }
Chris@696 118
Chris@696 119 prevy = y;
Chris@696 120 val += inc;
Chris@696 121 }
Chris@696 122 }