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Medusa is a JavaFX library containing gauges and clocks
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/*
* SPDX-License-Identifier: Apache-2.0
*
* Copyright 2016-2021 Gerrit Grunwald.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package eu.hansolo.medusa.skins;
import eu.hansolo.medusa.Fonts;
import eu.hansolo.medusa.Gauge;
import eu.hansolo.medusa.tools.AngleConicalGradient;
import eu.hansolo.medusa.tools.Helper;
import javafx.beans.InvalidationListener;
import javafx.scene.canvas.Canvas;
import javafx.scene.canvas.GraphicsContext;
import javafx.scene.layout.Pane;
import javafx.scene.paint.Color;
import javafx.scene.paint.Stop;
import javafx.scene.shape.Arc;
import javafx.scene.shape.ArcType;
import javafx.scene.shape.Circle;
import javafx.scene.shape.Line;
import javafx.scene.shape.Rectangle;
import javafx.scene.shape.StrokeLineCap;
import javafx.scene.text.Text;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import static eu.hansolo.medusa.tools.Helper.formatNumber;
public class NasaSkin extends GaugeSkinBase {
private static final double ANGLE_RANGE = 216;
private double size;
private double oldSize;
private Arc lowerFrame;
private Arc barBackground;
private Circle outerCircle;
private Circle innerCircle;
private Line separator;
private Arc bar;
private Canvas canvas;
private GraphicsContext ctx;
private Text titleText;
private Text valueText;
private Text unitText;
private Pane pane;
private AngleConicalGradient gradient;
private Rectangle gradientRect;
private boolean gradientNeedsRefresh;
private InvalidationListener decimalListener;
private InvalidationListener currentValueListener;
// ******************** Constructors **************************************
public NasaSkin(Gauge gauge) {
super(gauge);
if (gauge.isAutoScale()) gauge.calcAutoScale();
decimalListener = o -> handleEvents("DECIMALS");
currentValueListener = o -> setBar(gauge.getCurrentValue());
gradientNeedsRefresh = true;
initGraphics();
registerListeners();
setBar(gauge.getCurrentValue());
}
// ******************** Initialization ************************************
private void initGraphics() {
// Set initial size
if (Double.compare(gauge.getPrefWidth(), 0.0) <= 0 || Double.compare(gauge.getPrefHeight(), 0.0) <= 0 ||
Double.compare(gauge.getWidth(), 0.0) <= 0 || Double.compare(gauge.getHeight(), 0.0) <= 0) {
if (gauge.getPrefWidth() > 0 && gauge.getPrefHeight() > 0) {
gauge.setPrefSize(gauge.getPrefWidth(), gauge.getPrefHeight());
} else {
gauge.setPrefSize(PREFERRED_WIDTH, PREFERRED_HEIGHT);
}
}
outerCircle = new Circle();
outerCircle.setFill(null);
innerCircle = new Circle();
innerCircle.setFill(null);
lowerFrame = new Arc(PREFERRED_WIDTH * 0.5, PREFERRED_HEIGHT * 0.5, PREFERRED_WIDTH * 0.4, PREFERRED_HEIGHT * 0.4, gauge.getStartAngle() + 90, 144);
lowerFrame.setType(ArcType.OPEN);
lowerFrame.setStroke(gauge.getValueColor());
lowerFrame.setStrokeWidth(PREFERRED_WIDTH * 0.06043956);
lowerFrame.setStrokeLineCap(StrokeLineCap.BUTT);
lowerFrame.setFill(null);
barBackground = new Arc(PREFERRED_WIDTH * 0.5, PREFERRED_HEIGHT * 0.5, PREFERRED_WIDTH * 0.4, PREFERRED_HEIGHT * 0.4, gauge.getStartAngle() + 90, -ANGLE_RANGE);
barBackground.setType(ArcType.OPEN);
barBackground.setStroke(gauge.getBarBackgroundColor());
barBackground.setStrokeWidth(PREFERRED_WIDTH * 0.06043956);
barBackground.setStrokeLineCap(StrokeLineCap.BUTT);
barBackground.setFill(null);
separator = new Line();
separator.setStroke(gauge.getValueColor());
separator.setFill(gauge.getValueColor());
separator.setStrokeWidth(Helper.clamp(1, Double.MAX_VALUE, 0.00549451 * PREFERRED_WIDTH));
bar = new Arc(PREFERRED_WIDTH * 0.5, PREFERRED_HEIGHT * 0.5, PREFERRED_WIDTH * 0.4, PREFERRED_HEIGHT * 0.4, gauge.getStartAngle() + 90, 0);
bar.setType(ArcType.OPEN);
bar.setStroke(gauge.getBarColor());
bar.setStrokeWidth(PREFERRED_WIDTH * 0.06043956);
bar.setStrokeLineCap(StrokeLineCap.BUTT);
bar.setFill(null);
canvas = new Canvas(PREFERRED_WIDTH, PREFERRED_HEIGHT);
ctx = canvas.getGraphicsContext2D();
titleText = new Text(gauge.getTitle());
titleText.setFill(gauge.getTitleColor());
Helper.enableNode(titleText, !gauge.getTitle().isEmpty());
valueText = new Text();
valueText.setStroke(null);
valueText.setFill(gauge.getValueColor());
Helper.enableNode(valueText, gauge.isValueVisible());
unitText = new Text();
unitText.setStroke(null);
unitText.setFill(gauge.getUnitColor());
Helper.enableNode(unitText, gauge.isValueVisible() && !gauge.getUnit().isEmpty());
if (gauge.isGradientBarEnabled()) { setupGradient(); }
pane = new Pane(outerCircle, innerCircle, lowerFrame, barBackground, separator, titleText, valueText, unitText, bar, canvas);
getChildren().setAll(pane);
}
@Override protected void registerListeners() {
super.registerListeners();
gauge.decimalsProperty().addListener(decimalListener);
gauge.currentValueProperty().addListener(currentValueListener);
}
// ******************** Methods *******************************************
@Override protected void handleEvents(final String EVENT_TYPE) {
super.handleEvents(EVENT_TYPE);
if ("VISIBILITY".equals(EVENT_TYPE)) {
Helper.enableNode(valueText, gauge.isValueVisible());
Helper.enableNode(titleText, !gauge.getTitle().isEmpty());
Helper.enableNode(unitText, gauge.isValueVisible() && !gauge.getUnit().isEmpty());
}else if ("RECALC".equals(EVENT_TYPE)) {
redraw();
setBar(gauge.getCurrentValue());
}
}
@Override public void dispose() {
gauge.decimalsProperty().removeListener(decimalListener);
gauge.currentValueProperty().removeListener(currentValueListener);
super.dispose();
}
// ******************** Canvas ********************************************
private void setBar( final double VALUE ) {
double barLength = 0;
double barStart = 0;
double min = gauge.getMinValue();
double max = gauge.getMaxValue();
double step = gauge.getAngleStep();
double clampedValue = Helper.clamp(min, max, VALUE);
if (gauge.isStartFromZero()) {
if ( ( VALUE > min || min < 0 ) && ( VALUE < max || max > 0 ) ) {
if ( max < 0 ) {
barStart = gauge.getStartAngle() + 90 - gauge.getAngleRange();
barLength = ( max - clampedValue ) * step;
} else if ( min > 0 ) {
barStart = gauge.getStartAngle() + 90;
barLength = ( min - clampedValue ) * step;
} else {
barStart = gauge.getStartAngle() + 90 + min * step;
barLength = - clampedValue * step;
}
}
} else {
barStart = gauge.getStartAngle() + 90;
barLength = ( min - clampedValue ) * step;
}
bar.setStartAngle(barStart);
bar.setLength(barLength);
if (gauge.isGradientBarEnabled() && gauge.getGradientBarStops().size() > 1) {
bar.setStroke(gauge.getGradientLookup().getColorAt((VALUE - gauge.getMinValue()) / gauge.getRange()));
bar.setStroke(gradient.getImagePattern(gradientRect));
} else {
bar.setStroke(gauge.getBarColor());
}
valueText.setText(formatNumber(gauge.getLocale(), gauge.getFormatString(), gauge.getDecimals(), VALUE));
valueText.setLayoutX((size - valueText.getLayoutBounds().getWidth()) * 0.5);
}
private void drawTicks() {
double stepSize = ANGLE_RANGE / 100;
ctx.clearRect(0, 0, size, size);
Helper.drawRadialTickMarks(gauge, ctx, gauge.getMinValue(), gauge.getMaxValue(), -72, ANGLE_RANGE, stepSize, size * 0.5, size * 0.5, size * 1.045);
}
private void drawBackground() {
outerCircle.setStroke(gauge.getValueColor());
innerCircle.setStroke(gauge.getValueColor());
lowerFrame.setStroke(gauge.getValueColor());
barBackground.setStroke(gauge.getBarBackgroundColor());
separator.setStroke(gauge.getValueColor());
}
// ******************** Resizing ******************************************
private void resizeValueText() {
double maxWidth = size * 0.71;
double fontSize = size * 0.21;
valueText.setFont(Fonts.estrictaMedium(fontSize));
if (valueText.getLayoutBounds().getWidth() > maxWidth) { Helper.adjustTextSize(valueText, maxWidth, fontSize); }
valueText.relocate((size - valueText.getLayoutBounds().getWidth()) * 0.5, (size - valueText.getLayoutBounds().getHeight()) * 0.275);
}
private void resizeStaticText() {
double maxWidth = size * 0.67;
double fontSize = size * 0.13;
titleText.setFont(Fonts.estrictaRegularItalic(fontSize));
if (titleText.getLayoutBounds().getWidth() > maxWidth) { Helper.adjustTextSize(titleText, maxWidth, fontSize); }
titleText.relocate((size - titleText.getLayoutBounds().getWidth()) * 0.5, size * 0.64);
titleText.setFill(Color.RED);
fontSize = size * 0.08;
unitText.setFont(Fonts.estrictaRegularItalic(fontSize));
if (unitText.getLayoutBounds().getWidth() > maxWidth) { Helper.adjustTextSize(unitText, maxWidth, fontSize); }
unitText.relocate((size - unitText.getLayoutBounds().getWidth()) * 0.5, size * 0.52);
}
private void setupGradient() {
List stops = gauge.getGradientBarStops();
Map stopAngleMap = new HashMap<>(stops.size());
for (Stop stop : stops) { stopAngleMap.put(stop.getOffset() * 216, stop.getColor()); }
gradient = new AngleConicalGradient(size * 0.5, size * 0.5, 252, stopAngleMap, gauge.getScaleDirection());
gradientRect = new Rectangle(0, 0, size, size);
gradientNeedsRefresh = false;
}
@Override protected void resize() {
double width = gauge.getWidth() - gauge.getInsets().getLeft() - gauge.getInsets().getRight();
double height = gauge.getHeight() - gauge.getInsets().getTop() - gauge.getInsets().getBottom();
size = width < height ? width : height;
if (width > 0 && height > 0) {
pane.setMaxSize(size, size);
pane.setPrefSize(size, size);
pane.relocate((gauge.getWidth() - size) * 0.5, (gauge.getHeight() - size) * 0.5);
if (oldSize != size) { gradientNeedsRefresh = true; }
if (gauge.isGradientBarEnabled() && gradientNeedsRefresh) { setupGradient(); }
double centerX = size * 0.5;
double centerY = size * 0.5;
outerCircle.setCenterX(centerX);
outerCircle.setCenterY(centerY);
outerCircle.setRadius(size * 0.5);
outerCircle.setStrokeWidth(1);
innerCircle.setCenterX(centerX);
innerCircle.setCenterY(centerY);
innerCircle.setRadius(size * 0.43956044);
innerCircle.setStrokeWidth(1);
lowerFrame.setCenterX(centerX);
lowerFrame.setCenterY(centerY);
lowerFrame.setRadiusX(size * 0.46978022);
lowerFrame.setRadiusY(size * 0.46978022);
lowerFrame.setStrokeWidth(size * 0.06043956);
barBackground.setCenterX(centerX);
barBackground.setCenterY(centerY);
barBackground.setRadiusX(size * 0.46978022);
barBackground.setRadiusY(size * 0.46978022);
barBackground.setStrokeWidth(size * 0.06043956);
separator.setStartX(size * 0.16483516);
separator.setStartY(size * 0.6456044);
separator.setEndX(size * 0.83516484);
separator.setEndY(size * 0.6456044);
separator.setStrokeWidth(Helper.clamp(1, Double.MAX_VALUE, size * 0.00549451));
bar.setCenterX(centerX);
bar.setCenterY(centerY);
bar.setRadiusX(size * 0.46978022);
bar.setRadiusY(size * 0.46978022);
bar.setStrokeWidth(size * 0.06043956);
canvas.setWidth(size);
canvas.setHeight(size);
redraw();
}
oldSize = size;
}
@Override protected void redraw() {
if (gauge.isGradientBarEnabled() && gradientNeedsRefresh) { setupGradient(); }
drawBackground();
setBar(gauge.getCurrentValue());
drawTicks();
resizeValueText();
titleText.setText(gauge.getTitle());
unitText.setText(gauge.getUnit());
resizeStaticText();
titleText.setFill(gauge.getTitleColor());
valueText.setFill(gauge.getValueColor());
unitText.setFill(gauge.getUnitColor());
}
}