加快MonoGame的绘图速度

Question

我是MonoGame开发人员，我正在开发一个允许用户用手指画画的项目

手机屏幕，我通过在手指路径上重复绘制图像来做到这一点：

我使用了这样的代码：

LoadConent方法

texture = Content.Load<Texture2D>("b3");

renderTarget = new RenderTarget2D( this.GraphicsDevice, this.GraphicsDevice.PresentationParameters.BackBufferWidth, this.GraphicsDevice.PresentationParameters.BackBufferHeight, false, this.GraphicsDevice.PresentationParameters.BackBufferFormat, DepthFormat.None, 0, RenderTargetUsage.PreserveContents);

更新方法

   protected override void Update(GameTime gameTime)
    {
    TouchCollection touches = TouchPanel.GetState();

        foreach (TouchLocation touch in touches)
        {
            if (touch.State == TouchLocationState.Moved)
            {
                GraphicsDevice.SetRenderTarget(renderTarget);
                spriteBatch.Begin();
                spriteBatch.Draw(texture, touch.Position, Color.White);
                spriteBatch.End();
                GraphicsDevice.SetRenderTarget(null);
            }
           }
       base.Update(gameTime);
    }

绘制方法

  protected override void Draw(GameTime gameTime)
    {
        GraphicsDevice.Clear(Color.White);

        // TODO: Add your drawing code here
        spriteBatch.Begin();
        spriteBatch.Draw(renderTarget, Vector2.Zero, Color.White);
        spriteBatch.End();
       base.Draw(gameTime);
    }

我有这个结果：

所以，我的问题是：

如何加速绘图，我得到连续草图。

由于

Answer 1

试试这个。首先创建一个方法来绘制精灵间隔开的精灵：

    // increment is how far apart each sprite is drawn
    private void DrawEvenlySpacedSprites(Texture2D texture, Vector2 point1, Vector2 point2, float increment)
    {
        var distance = Vector2.Distance(point1, point2);    // the distance between two points
        var iterations = (int)(distance / increment);       // how many sprites with be drawn
        var normalizedIncrement = 1.0f / iterations;        // the Lerp method needs values between 0.0 and 1.0
        var amount = 0.0f;

        // not sure if this is needed but it's here to make sure at least one
        // sprite is drawn if the two points are very close together
        if(iterations == 0)
            iterations = 1;

        for (int i = 0; i < iterations; i++)
        {
            var drawPoint = Vector2.Lerp(point1, point2, amount);
            _spriteBatch.Draw(texture, drawPoint, Color.White);
            amount += normalizedIncrement;
        }
    }

然后将Update方法更改为以下内容：

    private Vector2? _previousPoint;
    protected override void Update(GameTime gameTime)
    {
        TouchCollection touches = TouchPanel.GetState();

        foreach (TouchLocation touch in touches)
        {
            if (touch.State == TouchLocationState.Moved)
            {
                GraphicsDevice.SetRenderTarget(renderTarget);
                _spriteBatch.Begin();

                if (_previousPoint.HasValue)
                    DrawEvenlySpacedSprites(texture, _previousPoint.Value, touch.Position, 0.5f);

                _spriteBatch.End();
                GraphicsDevice.SetRenderTarget(null);
            }
        }

        if (touches.Any())
            _previousPoint = touches.Last().Position;
        else
            _previousPoint = null;

        base.Update(gameTime);
    }

它应该在每个触摸点之间绘制许多均匀间隔的精灵，从而提供您正在寻找的效果，而无需加快渲染速度（无论如何都无法实现）。

让我知道它是怎么回事。祝你好运:)）