J2ME下实现滚动文字效果
J2ME下实现滚动文字也很简单,就是基于剪裁区的应用
看一下效果:
来看一下代码:
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private int tipStringPos = SCREEN_WIDTH; //当前字符串左边的位置 private int tipStringSpeed = 2; //字符串移动速度 private static final int TIPSTR_LEFT = 5 - 5; //左边消失绘制坐标 private static final int TIPSTR_RIGHT = 123 + 5; //右边出现绘制坐标 private static final int FONT_HEIGHT = 11; //字体高度 font.getHeight() 不准确 /** * @param Graphics g - 画刷 * @param String str - 所画字符串 * @param int height - 字符串高度 * @param int rectX - 剪裁区顶点X坐标 * @param int rectY - 剪裁区顶点Y坐标 * @param int rectWidth - 剪裁区宽度 * @param int rectHeight - 剪裁区高度 */ private void drawTipString(Graphics g, String str, int height, int rectX, int rectY, int rectWidth, int rectHeight) { int strWidth = g.getFont().stringWidth(str); int strHeight = FONT_HEIGHT; tipStringPos -= tipStringSpeed; if (tipStringPos + strWidth < TIPSTR_LEFT) { tipStringPos = TIPSTR_RIGHT; } //裁减区 int oldClipX = g.getClipX(); int oldClipY = g.getClipY(); int oldClipWidth = g.getClipWidth(); int oldClipHeight = g.getClipHeight(); g.setClip(rectX, rectY, rectWidth, rectHeight); g.drawString(str, tipStringPos, height - strHeight / 2, Graphics.LEFT | Graphics.TOP); g.setClip(oldClipX, oldClipY, oldClipWidth, oldClipHeight); } |
原理是很简单的,我感觉算法还是比较幼稚的,呵呵,你的算法呢?
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