如何捕捉矩形? [英] How do I rectangle capture ?

问题描述

我要拖动鼠标来拖动要捕获的区域.

I want to drag and mouse to drag an area I want to capture.


How do I drag the region to capture can be done?

推荐答案

为什么不做类似的事情(用伪代码)

Why not do something like (in pseudocode)

// In some sort of update loop
Rectangle dragRectangle;

if(Mouse.LeftButton.IsDown() && !oldMouseState.LeftButton.IsDown())
{
    dragRectangle.X = oldMousePosition.X;
    dragRectangle.Y = oldMousePosition.Y;
    dragRectangle.Width = oldMousePosition.X - Mouse.Position.X;
    dragRectangle.Height = oldMousePosition.Y - Mouse.Position.Y;
}

这样会给您一个矩形，该矩形的左上角原点应该在单击鼠标的位置，而宽度将是此更新在鼠标的任何位置?

That would give you a rectangle who''s left corner origin should be at the position the mouse was clicked and the width would be wherever the mouse was this update?

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