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Diffstat (limited to 'src/graphs/VerticalLabels.qml')
-rw-r--r-- | src/graphs/VerticalLabels.qml | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/src/graphs/VerticalLabels.qml b/src/graphs/VerticalLabels.qml new file mode 100644 index 0000000..5cb796b --- /dev/null +++ b/src/graphs/VerticalLabels.qml @@ -0,0 +1,79 @@ +/* + * Copyright (C) 2023 Arseniy Movshev <dodoradio@outlook.com> + * + * 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 3 of the License, or + * (at your option) any later version. + * + * This program 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 this program. If not, see <http://www.gnu.org/licenses/>. + */ + +import QtQuick 2.15 +import org.asteroid.controls 1.0 + +Item { + id: root + property real startValue: 0 + property real endValue: 0 + property int minLabels: 3 + property int maxLabels: 8 + property real valueDivisionsInterval: 0 + property real startValueDivision: 0 + property real valuesDelta + onStartValueChanged: update() + onEndValueChanged: update() + onMinLabelsChanged: update() + onMaxLabelsChanged: update() + + function update() { // this tries to guess how to generate nice looking labels + valuesDelta = endValue - startValue + var powTen = Math.pow(10,Math.trunc(Math.log10(valuesDelta))) + var interval = powTen + var numLabel = Math.floor(valuesDelta/interval) + if (numLabel > maxLabels) { + interval = powTen*2 + numLabel = valuesDelta/interval + if (numLabel > maxLabels) { + interval = powTen*5 + numLabel = valuesDelta/interval + if (numLabel > maxLabels) { + interval = powTen*10 + numLabel = valuesDelta/interval + } + } + } + if (numLabel < minLabels) { + interval = powTen/2 + numLabel = valuesDelta/interval + if (numLabel < minLabels) { + interval = powTen/5 + numLabel = valuesDelta/interval + if (numLabel < minLabels) { + interval = powTen/10 + numLabel = valuesDelta/interval + } + } + } + valueDivisionsInterval = interval + labelsRepeater.model = Math.round(numLabel) + 1 + startValueDivision = powTen*Math.trunc(startValue/powTen) + } + Repeater { + id: labelsRepeater + delegate: Label { + anchors.right: parent.right + property real value: root.startValueDivision + root.valueDivisionsInterval*index + text: value > 1000 ? value/1000 + "k" : value + font.pixelSize: Dims.w(5) + y: parent.height - (parent.height)*(value/root.valuesDelta) - height/2 + verticalAlignment: Text.AlignVCenter + } + } +} |