下面的代碼應該圍繞一個圓圈繪製文本0-23,就像在鐘面上一樣。這是通過將hoffet參數設置爲drawTextOnPath來完成的。但它只適用於圓圈的上半部分,爲什麼是這個,它是一個錯誤。事實上,它會在圓周上打印0 - 12,但十二個中的2個也會丟失。drawTextOnPath使用hoffset繪製文字繞圓圈?
Path circle = new Path();
circle.addCircle(0, 0, (float) radius, Direction.CW);
Shape shape2 = new PathShape(circle, 1, 1);
shape2.resize(1, 1); // have to call this sets scaling
shape2.draw(canvas, timeFramePaint);
for (int hour=0; hour < 24; ++hour) {
// Text
drawHour(canvas, hour, radius, textPaint, circle);
}
public void drawHour(Canvas canvas, int hour, double radius,
Paint paint, Path path) {
Logger.getAnonymousLogger().info(String.valueOf(hour));
float hOffset = (float) (hour * radius * Constants.Tau/24);
final float vOffset = 0;
canvas.drawTextOnPath(String.valueOf(hour), path, hOffset, vOffset, paint);
}
它似乎與文本對齊有關。如果對齊方式設置爲左側,則所有數字均被繪製,但略向右側偏移。 paint.setTextAlign(Paint.Align.LEFT); –