Java 如何在三角形上填充颜色
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How to fill color on triangle
提问by Jessy
I draw a triangle using line. How can I fill color on it? So far I can only success color the line but not fill the color.
我用线画了一个三角形。我怎样才能在上面填充颜色？到目前为止，我只能成功地为线条着色，但不能填充颜色。
public void paintComponent(Graphics g){
super.paintComponents(g);
int k=0;
for (j=0 ; j < numOfLines; j++){ // the values of numOfLines retrieved from other method.
g.setColor(Color.green);
g.drawLine(x[k], x[k+1], x[k+2], x[k+3]);
k = k+4; //index files
}
采纳答案by John Feminella
Make a Polygonfrom the vertices and fill that instead, by calling fillPolygon(...):
做一个Polygon从顶点和填充，而不是通过调用fillPolygon(...)：
// A simple triangle.
x[0]=100; x[1]=150; x[2]=50;
y[0]=100; y[1]=150; y[2]=150;
n = 3;
Polygon p = new Polygon(x, y, n); // This polygon represents a triangle with the above
// vertices.
g.fillPolygon(p); // Fills the triangle above.
回答by Mitch Wheat
You need to specify the vertices of your polygon (in this case, a triangle) and pass to fillPolygon():
您需要指定多边形的顶点（在本例中为三角形）并传递给 fillPolygon():
public void paint(Graphics g)
{
int xpoints[] = {25, 145, 25, 145, 25};
int ypoints[] = {25, 25, 145, 145, 25};
int npoints = 5;
g.fillPolygon(xpoints, ypoints, npoints);
}
回答by LiNKeR
public void paintComponent(Graphics g){
super.paintComponents(g);
int x[] = {1,2,3};
int y[] = {4,5,6};
int npoints = x.length;//or y.length
g.drawPolygon(x, y, npoints);//draws polygon outline
g.fillPolygon(x, y, npoints);//paints a polygon
}
