import javafx.scene.shape.Path; //導入方法依賴的package包/類

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);

}

}

ring = new Path();

ring.setFillRule(FillRule.EVEN_ODD);

ring.setStroke(null);

ring.setFill(Gauge.DARK_COLOR);

ring.setEffect(new InnerShadow(BlurType.TWO_PASS_BOX, Color.rgb(255, 255, 255, 0.35), 1, 0, 0, 1));

sectionsCanvas = new Canvas(PREFERRED_WIDTH, PREFERRED_HEIGHT);

sectionsCtx = sectionsCanvas.getGraphicsContext2D();

mask = new Circle();

mask.setStroke(null);

mask.setFill(gauge.getBackgroundPaint());

knob = new Circle();

knob.setStroke(null);

knob.setFill(gauge.getKnobColor());

angleStep = ANGLE_RANGE / (gauge.getRange());

double targetAngle = 180 - START_ANGLE + (gauge.getValue() - gauge.getMinValue()) * angleStep;

needleRotate = new Rotate(180 - START_ANGLE);

needleRotate.setAngle(Helper.clamp(180 - START_ANGLE, 180 - START_ANGLE + ANGLE_RANGE, targetAngle));

needle = new Path();

needle.setFillRule(FillRule.EVEN_ODD);

needle.setStroke(null);

needle.getTransforms().setAll(needleRotate);

valueText = new Text(formatNumber(gauge.getLocale(), gauge.getFormatString(), gauge.getDecimals(), gauge.getMinValue()) + gauge.getUnit());

valueText.setMouseTransparent(true);

valueText.setTextOrigin(VPos.CENTER);

valueText.setFill(gauge.getValueColor());

Helper.enableNode(valueText, gauge.isValueVisible());

titleText = new Text(gauge.getTitle());

titleText.setTextOrigin(VPos.CENTER);

titleText.setFill(gauge.getTitleColor());

Helper.enableNode(titleText, !gauge.getTitle().isEmpty());

// Add all nodes

pane = new Pane(ring, sectionsCanvas, mask, knob, needle, valueText, titleText);

getChildren().setAll(pane);

}

總結

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