com.aspose.words

Example:

Document doc = new Document();
DocumentBuilder builder = new DocumentBuilder(doc);

Shape shape = builder.insertShape(ShapeType.RECTANGLE, 80.0, 80.0);
// Apply One-color gradient fill to the shape with ForeColor of gradient fill.
shape.getFill().oneColorGradient(Color.RED, GradientStyle.HORIZONTAL, GradientVariant.VARIANT_2, 0.1);

Assert.assertEquals(Color.RED.getRGB(), shape.getFill().getForeColor().getRGB());
Assert.assertEquals(GradientStyle.HORIZONTAL, shape.getFill().getGradientStyle());
Assert.assertEquals(GradientVariant.VARIANT_2, shape.getFill().getGradientVariant());
Assert.assertEquals(270, shape.getFill().getGradientAngle());

shape = builder.insertShape(ShapeType.RECTANGLE, 80.0, 80.0);
// Apply Two-color gradient fill to the shape.
shape.getFill().twoColorGradient(GradientStyle.FROM_CORNER, GradientVariant.VARIANT_4);
// Change BackColor of gradient fill.
shape.getFill().setBackColor(Color.YELLOW);
// Note that changes "GradientAngle" for "GradientStyle.FromCorner/GradientStyle.FromCenter"
// gradient fill don't get any effect, it will work only for linear gradient.
shape.getFill().setGradientAngle(15.0);

Assert.assertEquals(Color.YELLOW.getRGB(), shape.getFill().getBackColor().getRGB());
Assert.assertEquals(GradientStyle.FROM_CORNER, shape.getFill().getGradientStyle());
Assert.assertEquals(GradientVariant.VARIANT_4, shape.getFill().getGradientVariant());
Assert.assertEquals(0, shape.getFill().getGradientAngle());

// Use the compliance option to define the shape using DML if you want to get "GradientStyle",
// "GradientVariant" and "GradientAngle" properties after the document saves.
OoxmlSaveOptions saveOptions = new OoxmlSaveOptions(); { saveOptions.setCompliance(OoxmlCompliance.ISO_29500_2008_STRICT); }

doc.save(getArtifactsDir() + "Shape.GradientFill.docx", saveOptions);