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我有这段代码。 只有第一个drawLine被绘制,其余2个不是。任何人都可以解释为什么另外两条曲线在目前的情况下不起作用吗? 如果在drawLine()语句中将“factor”替换为“1/2”,它们将起作用。 由于在Canvas.drawLine()中使用常量
公共类的RenderView延伸查看{
Paint paint;
private float factor = 1/2;
public RenderView(Context context) {
// TODO Auto-generated constructor stub
super(context);
paint = new Paint(Paint.ANTI_ALIAS_FLAG);
}
@Override
protected void onDraw(Canvas canvas) {
int screenWidth = canvas.getWidth();
int screenHeight = canvas.getHeight();
paint.setColor(Color.RED);
canvas.drawLine(0, 0, screenWidth, screenHeight, paint);
canvas.drawLine(factor*screenWidth, 0, factor*screenWidth, screenHeight, paint);
canvas.drawLine(0, factor*screenHeight, screenWidth, factor*screenHeight, paint);
invalidate();
}
}