如何将着色模式添加到自定义形状 [英] How to add a shading pattern to a custom shape
问题描述
我使用iText绘制了一个等边三角形
canvas.setColorStroke(BaseColor.BLACK);
int x = start.getX();
int y = start.getY();
canvas.moveTo(x,y);
canvas.lineTo(x + side,y);
canvas.lineTo(x +(side / 2),(float)(y +(side * Math.sin(convertToRadian(60)))));
canvas.closePathStroke();
我想在这个形状中使用多色渐变,即用 BaseColor.PINK
和 BaseColor.BLUE
。我只是找不到用iText做这个的方法吗?
我创建了一个名为获取完整的源代码。
I have drawn an equilateral triangle as follows using iText
canvas.setColorStroke(BaseColor.BLACK);
int x = start.getX();
int y = start.getY();
canvas.moveTo(x,y);
canvas.lineTo(x + side,y);
canvas.lineTo(x + (side/2), (float)(y+(side*Math.sin(convertToRadian(60)))));
canvas.closePathStroke();
I wish to multi color gradient in this shape i.e. fill it with shading comprising of BaseColor.PINK
and BaseColor.BLUE
. I just can't find a way to do this with iText ?
I've created an example called ShadedFill that fills the triangle you are drawing using a shading pattern that goes from pink to blue as show in the shaded_fill.pdf:
PdfContentByte canvas = writer.getDirectContent();
float x = 36;
float y = 740;
float side = 70;
PdfShading axial = PdfShading.simpleAxial(writer, x, y,
x + side, y, BaseColor.PINK, BaseColor.BLUE);
PdfShadingPattern shading = new PdfShadingPattern(axial);
canvas.setShadingFill(shading);
canvas.moveTo(x,y);
canvas.lineTo(x + side, y);
canvas.lineTo(x + (side / 2), (float)(y + (side * Math.sin(Math.PI / 3))));
canvas.closePathFillStroke();
As you can see, you need to create a PdfShading
object. I created an axial shading that varies from pink to blue from the coordinate (x, y)
to the coordinate (x + side, y)
. With this axial shading, you can create a PdfShadingPattern
that can be used as a parameter of the setShadingFill()
method to set the fill color for the canvas
.
See ShadedFill for the full source code.
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