/**
* 得到以start开始end结束的内存地址在屏幕上的显示区域<p>
* @param start 开始地址,包括
* @param end 结束地址,不包括
* @return 该内存区域在屏幕显示区域的最小覆盖矩形;如果不存在现存或该内存块不与显存相交,则返回一个空的Area
*/
public Area intersectWithGraph(int start, int end)
{
if (graphRam == null)
{
return(Area.EMPTY_AREA);
}
if (start >= graphRam.getStartAddr() + graphRam.size() || end <= graphRam.getStartAddr())
{
return(Area.EMPTY_AREA);
}
if (start < graphRam.getStartAddr())
{
start = graphRam.getStartAddr();
}
if (end > graphRam.getStartAddr() + graphRam.size())
{
end = graphRam.getStartAddr() + graphRam.size();
}
start <<= 3;
end = (end << 3) - 1;
int y1 = start / screen.getWidth();
int x1 = start % screen.getWidth();
int y2 = end / screen.getWidth();
int x2 = end % screen.getWidth();
if (y1 == y2)
{
return(new Area(x1, y1, x2 - x1 + 1, 1));
}
else
{
return(new Area(0, y1, screen.getWidth(), y2 - y1 + 1));
}
}
/// <summary>
/// 设置用于显示的ScreenModel,并作适当的初始化
/// </summary>
/// <param name="screen"></param>
public void setScreenModel(ScreenModel screen)
{
if (screen == null)
{
//throw new IllegalArgumentException("Screen must't be null!");
}
if (this.screen != screen)
{
this.screen = screen;
this.buffer = new sbyte[(screen.getWidth() / 6) * (screen.getHeight() / 13)];
this.getter = new ByteArrayGetter(buffer);
this.ram = new ByteArrayRam(buffer, screen);
this.render = screen.getRender();
}
else
{
ram.Clear();
}
this.curCol = this.curRow = 0;
this.isBigMode = true;
this.maxCol = screen.getWidth() / 8;
this.maxRow = screen.getHeight() / 16;
}
