Examples of java.awt.LinearGradientPaint

java.awt.LinearGradientPaint
The {@code LinearGradientPaint} class provides a way to filla {@link java.awt.Shape} with a linear color gradient pattern. The usermay specify two or more gradient colors, and this paint will provide an interpolation between each color. The user also specifies start and end points which define where in user space the color gradient should begin and end.
The user must provide an array of floats specifying how to distribute the colors along the gradient. These values should range from 0.0 to 1.0 and act like keyframes along the gradient (they mark where the gradient should be exactly a particular color).
In the event that the user does not set the first keyframe value equal to 0 and/or the last keyframe value equal to 1, keyframes will be created at these positions and the first and last colors will be replicated there. So, if a user specifies the following arrays to construct a gradient:
```
 {Color.BLUE, Color.RED}, {.3f, .7f} 
```
this will be converted to a gradient with the following keyframes:
```
 {Color.BLUE, Color.BLUE, Color.RED, Color.RED}, {0f, .3f, .7f, 1f} 
```
The user may also select what action the {@code LinearGradientPaint}should take when filling color outside the start and end points. If no cycle method is specified, {@code NO_CYCLE} will be chosen bydefault, which means the endpoint colors will be used to fill the remaining area.
The colorSpace parameter allows the user to specify in which colorspace the interpolation should be performed, default sRGB or linearized RGB.
The following code demonstrates typical usage of {@code LinearGradientPaint}:
```
 Point2D start = new Point2D.Float(0, 0); Point2D end = new Point2D.Float(50, 50); float[] dist = {0.0f, 0.2f, 1.0f}; Color[] colors = {Color.RED, Color.WHITE, Color.BLUE}; LinearGradientPaint p = new LinearGradientPaint(start, end, dist, colors); 
```
This code will create a {@code LinearGradientPaint} which interpolatesbetween red and white for the first 20% of the gradient and between white and blue for the remaining 80%.
This image demonstrates the example code above for each of the three cycle methods:

@see java.awt.Paint @see java.awt.Graphics2D#setPaint @author Nicholas Talian, Vincent Hardy, Jim Graham, Jerry Evans @since 1.6

            case COLOR: return Color.red;
            case GRADIENT: return
                new GradientPaint(startx, starty, Color.red,
                                  endx, endy, Color.green);
            case LINEAR_GRADIENT: return
                new LinearGradientPaint(startx, starty, endx, endy,
                    new float[] { 0.0f, 0.999f, 1.0f },
                    new Color[] { Color.red, Color.green, Color.blue });
            case RADIAL_GRADIENT: return
                new RadialGradientPaint(startx, starty,
                    (float)Math.sqrt(w * w + h * h),

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    private static class LinearGradient extends MultiGradient {
        private LinearGradient() {}


        @Override
        boolean isPaintValid(SunGraphics2D sg2d) {
            LinearGradientPaint paint = (LinearGradientPaint)sg2d.paint;


            if (paint.getFractions().length == 2 &&
                paint.getCycleMethod() != CycleMethod.REPEAT &&
                paint.getColorSpace() != ColorSpaceType.LINEAR_RGB)
            {
                D3DSurfaceData dstData = (D3DSurfaceData)sg2d.surfaceData;
                D3DGraphicsDevice gd = (D3DGraphicsDevice)
                    dstData.getDeviceConfiguration().getDevice();
                if (gd.isCapPresent(CAPS_LCD_SHADER)) {

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    for (int i = 0; i < cnt; i++) {
      fractions[i] = ((Number) params.get(4 + i * 2)).floatValue();
      colors[i] = (Color) params.get(5 + i * 2);
    }


    return new LinearGradientPaint(x1, y1, x2, y2, fractions, colors);
  }

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  public static Paint buildPaint(Paint p, double x, double y, double w, double h) {
    if (p instanceof Color) return p;


    if (p instanceof LinearGradientPaint) {
      LinearGradientPaint gp = (LinearGradientPaint) p;
      double x1 = gp.getStartPoint().getX() * w + x;
      double y1 = gp.getStartPoint().getY() * h + y;
      double x2 = gp.getEndPoint().getX() * w + x;
      double y2 = gp.getEndPoint().getY() * h + y;
      return new LinearGradientPaint(new Point2D.Double(x1, y1), new Point2D.Double(x2, y2), gp.getFractions(), gp.getColors());
    }


    assert false;
    return null;
  }

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                    Color color = decodeColor(JSON.getString(stop, COLOR_KEY));
                    colors[i] = color;
                }


                paint = new LinearGradientPaint(startX, startY, endX, endY, fractions, colors);
                break;
            }


            case RADIAL_GRADIENT: {
                float centerX = JSON.getFloat(dictionary, CENTER_X_KEY);

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              .getUltraLightColor()
              : scheme.getLightColor();
          Color rightColor = ((fillKind == MenuGutterFillKind.SOFT_FILL) || (fillKind == MenuGutterFillKind.SOFT)) ? scheme
              .getUltraLightColor()
              : scheme.getLightColor();
          LinearGradientPaint gp = new LinearGradientPaint(0, 0,
              textOffset, 0, new float[] { 0.0f, 1.0f },
              new Color[] { leftColor, rightColor },
              CycleMethod.REPEAT);
          graphics.setComposite(LafWidgetUtilities.getAlphaComposite(
              menuItem, 0.7f, g));


          // System.out.println(menuItem.getText()
          // + "["
          // + menuItem.isEnabled()
          // + "] : "
          // + ((AlphaComposite) graphics.getComposite())
          // .getAlpha() + ", " + leftColor + "->"
          // + rightColor);
          //
          graphics.setPaint(gp);
          graphics.fillRect(0, 0, textOffset - 2, menuHeight);
        }
      } else {
        // fix for defect 125 - support of RTL menus
        MenuGutterFillKind fillKind = SubstanceCoreUtilities
            .getMenuGutterFillKind();
        if (fillKind != MenuGutterFillKind.NONE) {
          SubstanceColorScheme scheme = SubstanceColorSchemeUtilities
              .getColorScheme(menuItem, ComponentState.ENABLED);
          Color leftColor = ((fillKind == MenuGutterFillKind.HARD_FILL) || (fillKind == MenuGutterFillKind.HARD)) ? scheme
              .getLightColor()
              : scheme.getUltraLightColor();
          Color rightColor = ((fillKind == MenuGutterFillKind.HARD_FILL) || (fillKind == MenuGutterFillKind.SOFT)) ? scheme
              .getLightColor()
              : scheme.getUltraLightColor();


          LinearGradientPaint gp = new LinearGradientPaint(
              textOffset, 0, menuWidth, 0, new float[] { 0.0f,
                  1.0f },
              new Color[] { leftColor, rightColor },
              CycleMethod.REPEAT);
          graphics.setComposite(LafWidgetUtilities.getAlphaComposite(

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                final float fStep = 1.0f / (COL_ROBOT.length-1);
                final float[] fractions = new float[COL_ROBOT.length];
                for (int i = 1; i < fractions.length; ++i) {
                    fractions[i] = fractions[i - 1] + fStep;
                }
                thePaint = new LinearGradientPaint(0, 0, 0, this.height, fractions, COL_ROBOT, MultipleGradientPaint.CycleMethod.REPEAT);
            } else {
                thePaint = new GradientPaint(0, 0, COL_ROBOT[this.goal.robotNumber], 0, this.height, Color.DARK_GRAY);
            }
            g2d.setPaint(thePaint);
            final Shape outerShape = new Rectangle2D.Double(0, 0, this.width, this.height);

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                final float fStep = 1.0f / (COL_ROBOT.length-1);
                final float[] fractions = new float[COL_ROBOT.length];
                for (int i = 1; i < fractions.length; ++i) {
                    fractions[i] = fractions[i - 1] + fStep;
                }
                thePaint = new LinearGradientPaint(0, 0, 0, this.height, fractions, COL_ROBOT, MultipleGradientPaint.CycleMethod.REPEAT);
            } else {
                thePaint = new GradientPaint(0, 0, COL_ROBOT[this.goal.robotNumber], 0, this.height, Color.DARK_GRAY);
            }
            g2d.setPaint(thePaint);
            final Shape outerShape = new Rectangle2D.Double(0, 0, this.width, this.height);

View Full Code Here

                final float fStep = 1.0f / (COL_ROBOT.length-1);
                final float[] fractions = new float[COL_ROBOT.length];
                for (int i = 1; i < fractions.length; ++i) {
                    fractions[i] = fractions[i - 1] + fStep;
                }
                thePaint = new LinearGradientPaint(0, 0, 0, this.height, fractions, COL_ROBOT, MultipleGradientPaint.CycleMethod.REPEAT);
            } else {
                thePaint = new GradientPaint(0, 0, COL_ROBOT[this.goal.robotNumber], 0, this.height, Color.DARK_GRAY);
            }
            g2d.setPaint(thePaint);
            final Shape outerShape = new Rectangle2D.Double(0, 0, this.width, this.height);

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                        final float fStep = 1.0f / (COL_ROBOT.length-1);
                        final float[] fractions = new float[COL_ROBOT.length];
                        for (int i = 1; i < fractions.length; ++i) {
                            fractions[i] = fractions[i - 1] + fStep;
                        }
                        thePaint = new LinearGradientPaint(vWallWidth*2, hWallWidth*2, vWallWidth*2, height-1-hWallWidth*2, fractions, COL_ROBOT, MultipleGradientPaint.CycleMethod.REPEAT);
                    } else {
                        thePaint = new GradientPaint(0, 0, COL_ROBOT[goal.robotNumber], 0, height-1, Color.DARK_GRAY);
                    }
                    g2d.setPaint(thePaint);
                    final Shape outerShape = new Rectangle2D.Double(

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