view layer/LinearColourScale.cpp @ 789:9fd1bdf214dd tonioni

Play pointer: when user drags pane during playback such that the pointer is no longer visible, accept that and stop trying to track it until pointer naturally comes back within visible area
author Chris Cannam
date Thu, 12 Jun 2014 12:48:11 +0100
parents 1a1448f7beb2
children 1d526ba11a24
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/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */

/*
    Sonic Visualiser
    An audio file viewer and annotation editor.
    Centre for Digital Music, Queen Mary, University of London.
    This file copyright 2006-2013 Chris Cannam and QMUL.
    
    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License as
    published by the Free Software Foundation; either version 2 of the
    License, or (at your option) any later version.  See the file
    COPYING included with this distribution for more information.
*/

#include "LinearColourScale.h"
#include "ColourScaleLayer.h"

#include <QPainter>

#include <cmath>

#include "view/View.h"

int
LinearColourScale::getWidth(View *v,
			    QPainter &paint)
{
    return paint.fontMetrics().width("-000.00") + 15;
}

void
LinearColourScale::paintVertical(View *v,
				 const ColourScaleLayer *layer,
				 QPainter &paint,
				 int x0,
				 float min,
				 float max)
{
    int h = v->height();

    int n = 10;

    float val = min;
    float inc = (max - val) / n;

    char buffer[40];

    int w = getWidth(v, paint) + x0;

    int boxx = 5, boxy = 5;
    if (layer->getScaleUnits() != "") {
        boxy += paint.fontMetrics().height();
    }
    int boxw = 10, boxh = h - boxy - 5;

    int tx = 5 + boxx + boxw;
    paint.drawRect(boxx, boxy, boxw, boxh);

    paint.save();
    for (int y = 0; y < boxh; ++y) {
	float val = ((boxh - y) * (max - min)) / boxh + min;
	paint.setPen(layer->getColourForValue(v, val));
	paint.drawLine(boxx + 1, y + boxy + 1, boxx + boxw, y + boxy + 1);
    }
    paint.restore();

    float round = 1.f;
    int dp = 0;
    if (inc > 0) {
        int prec = trunc(log10f(inc));
        prec -= 1;
        if (prec < 0) dp = -prec;
        round = powf(10.f, prec);
#ifdef DEBUG_TIME_VALUE_LAYER
        cerr << "inc = " << inc << ", round = " << round << ", dp = " << dp << endl;
#endif
    }

    for (int i = 0; i < n; ++i) {

	int y, ty;

	y = boxy + int(boxh - ((val - min) * boxh) / (max - min));

	ty = y - paint.fontMetrics().height() +
	    paint.fontMetrics().ascent() + 2;

	sprintf(buffer, "%.*f", dp, val);
	QString label = QString(buffer);

	paint.drawLine(boxx + boxw - boxw/3, y, boxx + boxw, y);
	paint.drawText(tx, ty, label);

	val += inc;
    }
}