diff options
author | Bent Bisballe Nyeng <deva@aasimon.org> | 2017-02-17 20:24:10 +0100 |
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committer | Bent Bisballe Nyeng <deva@aasimon.org> | 2017-02-17 20:24:10 +0100 |
commit | ed5366c2c39d6f06dc0c394feff75047e30b8a55 (patch) | |
tree | 02a353681c566d0f0d69eff8f2b02ac0f7ac4843 /plugingui/knob.cc | |
parent | 2edbdee2c1c9db7c30a699b1f0c2eeebfd9e3d6b (diff) |
Make Knob support ranges other than [0; 1].
Diffstat (limited to 'plugingui/knob.cc')
-rw-r--r-- | plugingui/knob.cc | 56 |
1 files changed, 40 insertions, 16 deletions
diff --git a/plugingui/knob.cc b/plugingui/knob.cc index 0655a68..0c7159f 100644 --- a/plugingui/knob.cc +++ b/plugingui/knob.cc @@ -37,7 +37,8 @@ #endif #include <math.h> -namespace GUI { +namespace GUI +{ Knob::Knob(Widget *parent) : Widget(parent) @@ -48,24 +49,33 @@ Knob::Knob(Widget *parent) maximum = 1.0; minimum = 0.0; - currentValue = minimum; + current_value = 0.0; mouse_offset_x = 0; } void Knob::setValue(float value) { + value -= minimum; + value /= (maximum - minimum); internalSetValue(value); } +void Knob::setRange(float minimum, float maximum) +{ + this->minimum = minimum; + this->maximum = maximum; + internalSetValue(current_value); +} + float Knob::value() { - return currentValue; + return current_value * (maximum - minimum) + minimum; } void Knob::scrollEvent(ScrollEvent* scrollEvent) { - float value = currentValue - (scrollEvent->delta / 200.0); + float value = (current_value - (scrollEvent->delta / 200.0)); internalSetValue(value); } @@ -80,7 +90,7 @@ void Knob::mouseMoveEvent(MouseMoveEvent* mouseMoveEvent) float dval = mouse_offset_x - (mouseMoveEvent->x + (-1 * mouseMoveEvent->y)); - float value = currentValue - (dval / 300.0); + float value = current_value - (dval / 300.0); internalSetValue(value); @@ -95,7 +105,7 @@ void Knob::keyEvent(KeyEvent* keyEvent) return; } - float value = currentValue; + float value = current_value; switch(keyEvent->keycode) { case Key::up: value += 0.01; @@ -156,13 +166,27 @@ void Knob::repaintEvent(RepaintEvent* repaintEvent) p.clear(); p.drawImageStretched(0, 0, img_knob, diameter, diameter); + float range = maximum - minimum; + + // Show 0, 1 or 2 decimal point depending on the size of the range char buf[64]; - sprintf(buf, "%.2f", currentValue * maximum); + if(range> 100.0f) + { + sprintf(buf, "%.0f", current_value * range + minimum); + } + else if(range > 10.0f) + { + sprintf(buf, "%.1f", current_value * range + minimum); + } + else + { + sprintf(buf, "%.2f", current_value * range + minimum); + } 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 padval = current_value * 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; @@ -184,25 +208,25 @@ void Knob::repaintEvent(RepaintEvent* repaintEvent) } } -void Knob::internalSetValue(float value) +void Knob::internalSetValue(float new_value) { - if(value < minimum) + if(new_value < 0.0) { - value = minimum; + new_value = 0.0; } - if(value > maximum) + if(new_value > 1.0) { - value = maximum; + new_value = 1.0; } - if(value == currentValue) + if(new_value == current_value) { return; } - currentValue = value; - valueChangedNotifier(currentValue); + current_value = new_value; + valueChangedNotifier(value()); redraw(); } |