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Diffstat (limited to 'plugingui/knob.cc')
| -rw-r--r-- | plugingui/knob.cc | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/plugingui/knob.cc b/plugingui/knob.cc new file mode 100644 index 0000000..b843106 --- /dev/null +++ b/plugingui/knob.cc @@ -0,0 +1,188 @@ +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/*************************************************************************** + * knob.cc + * + * Thu Feb 28 07:37:27 CET 2013 + * Copyright 2013 Bent Bisballe Nyeng + * deva@aasimon.org + ****************************************************************************/ + +/* + * This file is part of DrumGizmo. + * + * DrumGizmo 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. + * + * DrumGizmo is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with DrumGizmo; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. + */ +#include "knob.h" + +#include "painter.h" + +#include <hugin.hpp> +#include <stdio.h> + +// M_PI is not defined in math.h if __STRICT_ANSI__ is defined. +#ifdef __STRICT_ANSI__ +#undef __STRICT_ANSI__ +#endif +#include <math.h> + +namespace GUI { + +Knob::Knob(Widget *parent) + : Widget(parent) + , img_knob(":knob.png") +{ + state = up; + + maximum = 1.0; + minimum = 0.0; + + currentValue = minimum; + + mouse_offset_x = 0; +} + +void Knob::setValue(float value) +{ + internalSetValue(value); +} + +float Knob::value() +{ + return currentValue; +} + +void Knob::scrollEvent(ScrollEvent *e) +{ + float value = currentValue - (e->delta / 200.0); + internalSetValue(value); +} + +void Knob::mouseMoveEvent(MouseMoveEvent *e) +{ + if(state == down) { + if(mouse_offset_x == (e->x + -1 * e->y)) { + return; + } + + float dval = mouse_offset_x - (e->x + -1 * e->y); + float value = currentValue - (dval / 300.0); + + internalSetValue(value); + + mouse_offset_x = e->x + -1 * e->y; + } +} + +void Knob::keyEvent(KeyEvent *e) +{ + if(e->direction != -1) { + return; + } + + float value = currentValue; + switch(e->keycode) { + case KeyEvent::KEY_UP: + value += 0.01; + break; + case KeyEvent::KEY_DOWN: + value -= 0.01; + break; + case KeyEvent::KEY_RIGHT: + value += 0.01; + break; + case KeyEvent::KEY_LEFT: + value -= 0.01; + break; + case KeyEvent::KEY_HOME: + value = 0; + break; + case KeyEvent::KEY_END: + value = 1; + break; + default: + break; + } + + internalSetValue(value); +} + +void Knob::buttonEvent(ButtonEvent *e) +{ + if(e->direction == 1) { + state = down; + mouse_offset_x = e->x + -1*e->y; + } + if(e->direction == -1) { + state = up; + mouse_offset_x = e->x + -1*e->y; + clicked(); + } +} + +void Knob::repaintEvent(RepaintEvent *e) +{ + int diameter = (width()>height()?height():width()); + int radius = diameter / 2; + int center_x = width() / 2; + int center_y = height() / 2; + + Painter p(this); + + p.clear(); + p.drawImageStretched(0, 0, &img_knob, diameter, diameter); + + char buf[64]; + sprintf(buf, "%.2f", currentValue * maximum); + Font font; + p.drawText(center_x - font.textWidth(buf) / 2 + 1, + center_y + font.textHeight(buf) / 2 + 1, font, buf); + + // Make it start from 20% and stop at 80% + double padval = currentValue * 0.8 + 0.1; + + double from_x = sin((-1 * padval + 1) * 2 * M_PI) * radius * 0.6; + double from_y = cos((-1 * padval + 1) * 2 * M_PI) * radius * 0.6; + + double to_x = sin((-1 * padval + 1) * 2 * M_PI) * radius * 0.8; + double to_y = cos((-1 * padval + 1) * 2 * M_PI) * radius * 0.8; + + // Draw "fat" line by drawing 9 lines with moved start/ending points. + p.setColour(Colour(1, 0, 0, 1)); + for(int _x = -1; _x < 2; _x++) { + for(int _y = -1; _y < 2; _y++) { + p.drawLine(from_x + center_x + _x, + from_y + center_y + _y, + to_x + center_x + _x, + to_y + center_y + _y); + + } + } +} + +void Knob::internalSetValue(float value) +{ + if(value < minimum) value = minimum; + if(value > maximum) value = maximum; + + if(value == currentValue) { + return; + } + + currentValue = value; + valueChangedNotifier.notify(currentValue); + repaintEvent(NULL); +} + +} // GUI:: |