如何在BlackBerry应用程序中制作半圆形

Question

在电子邮件下方，用户将在密码下方输入电子邮件n，用户将输入密码，我可以制作正方形，但上方应为上侧曲线和下侧下方。

Answer 1

我认为我会做出你想做的事情。您只需将它们添加到此Manager即可。请注意，我认为我没有补偿margin或padding之类的内容，所以你可以用paint()方法计算它，或者只是将它包含在另一个具有正确填充/边距的Manager中：< / p>

public class GroupFieldManager extends VerticalFieldManager {
    private int _rounding;
    private int _bgColor;
    private int _borderColor;

    private boolean _divider;
    private int _dividerColor;

    public GroupFieldManager(boolean divider, long style) {
        super(style);
        _rounding = 20;
        _bgColor = 0xFFFFFF;
        _borderColor = 0xAAAAAA;
        _divider = divider;
        _dividerColor = 0xAAAAAA;
    }

    public GroupFieldManager(boolean divider) {
        this(divider, 0);
    }

    public GroupFieldManager() {
        this(false, 0);
    }

    /**
     * Sets whether or not to draw a divider
     * @param on
     */
    public void setDivider(boolean on) {
        _divider = on;
    }

    /**
     * Sets the color for the divider (also turns divider on)
     * @param color
     */
    public void setDividerColor(int color){
        _dividerColor = color;
        _divider = true;
    }

    /**
     * Sets the background color for the grouping
     * @param color
     */
    public void setBackgroundColor(int color) {
        _bgColor = color;
    }

    /**
     * Sets the border color for the grouping
     * @param color
     */
    public void setBorderColor(int color) {
        _borderColor = color;
    }

    /**
     * Sets the amount of rounding for the border
     * @param rounding
     */
    public void setRounding(int rounding) {
        _rounding = rounding;
    }

    protected void paint(Graphics graphics) {
        int oldColor = graphics.getColor();

        //draw the background
        graphics.setColor(_bgColor);
        graphics.fillRoundRect(0, 0, getWidth(), getHeight(), _rounding, _rounding);

        //draw the border
        graphics.setColor(_borderColor);
        graphics.drawRoundRect(0, 0, getWidth(), getHeight(), _rounding, _rounding);

        //draw dividers
        if(_divider) {
            graphics.setColor(_dividerColor);
            int y = 0;

            //go through each field, figure it's height, and draw a line under it
            for(int i=0;i<getFieldCount();i++) {
                if(i != getFieldCount() - 1) {
                    int height = getField(i).getHeight();
                    y += height;

                    graphics.drawLine(0, y, getWidth(), y);
                }
            }
        }

        graphics.setColor(oldColor);
        super.paint(graphics);
    }
}

Answer 2

由于只有可用于绘制四个圆角的方法，因此您可以使用剪切矩形将绘图剪切为直线，即您实际绘制一个较大的圆角矩形，但剪切它的下部（或上部）。 / p>