Class HiDPIUtils

java.lang.Object
com.formdev.flatlaf.util.HiDPIUtils

public class HiDPIUtils extends Object
  • Field Details

    • useTextYCorrection

      private static Boolean useTextYCorrection
    • SCALE_FACTORS

      private static final float[] SCALE_FACTORS
    • CORRECTION_SEGOE_UI

      private static final float[] CORRECTION_SEGOE_UI
    • CORRECTION_TAHOMA

      private static final float[] CORRECTION_TAHOMA
    • CORRECTION_INTER

      private static final float[] CORRECTION_INTER
    • CORRECTION_OPEN_SANS

      private static final float[] CORRECTION_OPEN_SANS
    • useDebugScaleFactor

      private static Boolean useDebugScaleFactor
  • Constructor Details

    • HiDPIUtils

      public HiDPIUtils()
  • Method Details

    • paintAtScale1x

      public static void paintAtScale1x(Graphics2D g, JComponent c, HiDPIUtils.Painter painter)
    • paintAtScale1x

      public static void paintAtScale1x(Graphics2D g, int x, int y, int width, int height, HiDPIUtils.Painter painter)
      Paint at system scale factor 1x to avoid rounding issues at 125%, 150% and 175% scaling.

      Scales the given Graphics2D down to 100% and invokes the given painter passing scaled x, y, width and height.

      Uses the same scaling calculation as the JRE uses.

    • scale

      private static Rectangle2D.Double scale(double scaleX, double scaleY, double px, double py, int width, int height)
      Scales a rectangle in the same way as the JRE does in sun.java2d.pipe.PixelToParallelogramConverter.fillRectangle(), which is used by Graphics.fillRect().
    • normalize

      private static double normalize(double value)
    • useTextYCorrection

      private static boolean useTextYCorrection()
    • computeTextYCorrection

      public static float computeTextYCorrection(Graphics2D g)
      When painting text on HiDPI screens and the JRE scales, then the text is painted too far down on some operating systems. The higher the system scale factor is, the more.

      This method computes a correction value for the Y position.

    • correctionForScaleY

      private static float correctionForScaleY(Graphics2D g, float[] correction)
    • scaleFactor2index

      private static int scaleFactor2index(float scaleFactor)
    • useDebugScaleFactor

      private static boolean useDebugScaleFactor()
    • getUserScaleFactor

      private static float getUserScaleFactor()
    • drawStringWithYCorrection

      public static void drawStringWithYCorrection(JComponent c, Graphics2D g, String text, int x, int y)
      Applies Y correction and draws the given string at the specified location. The provided component is used to query text properties and anti-aliasing hints.

      Use this method instead of Graphics.drawString(String, int, int) for correct anti-aliasing.

      Replacement for SwingUtilities2.drawString().

    • drawStringUnderlineCharAtWithYCorrection

      public static void drawStringUnderlineCharAtWithYCorrection(JComponent c, Graphics2D g, String text, int underlinedIndex, int x, int y)
      Applies Y correction and draws the given string at the specified location underlining the specified character. The provided component is used to query text properties and anti-aliasing hints.

      Replacement for SwingUtilities2.drawStringUnderlineCharAt().

    • createGraphicsTextYCorrection

      public static Graphics2D createGraphicsTextYCorrection(Graphics2D g)
      Creates a graphics object and applies Y correction to string drawing methods. If no Y correction is necessary, the passed in graphics object is returned.