在libGDX中画线动画

Question

我在做libGdx的第一个游戏。我必须做的线画动画像this video

这里是我的代码的DrawLine

Vector2 start = new Vector2(10, 10); 
Vector2 end = new Vector2(100,100); 
ShapeRenderer shapeRenderer=new ShapeRenderer(); 
shapeRenderer.setProjectionMatrix(cam.combined); 
shapeRenderer.begin(ShapeRenderer.ShapeType.Line); 
shapeRenderer.setColor(Color.BLACK); 
shapeRenderer.line(start, end); 
shapeRenderer.end(); 

我能够得出两点间的直线，但需要与绘图动画。

有帮助吗？基于您的代码

Answer 1

，你只需要做出的坐标值动态：

Vector2 startPt = null; 
Vector2 endPt = null; 
Vector2 movingPt = null; 

void myInit() 
{ 
    startPt = new Vector2(10, 10); 
    endPt = new Vector2(100, 100); 
    movingPt = new Vector2(startPt.x, startPt.y); 
} 

void update(float delta) 
{ 
    // add your animation here, below is an example 
    float PixelsPerSecond = 100f; 
    float dt = delta * PixelsPerSecond; 
    if (movingPt.x < endPt.x) movingPt.x += dt; 
    else movingPt.x = endPt.x; 
    if (movingPt.y < endPt.y) movingPt.y += dt; 
    else movingPt.y = endPt.y; 
} 

void draw() 
{ 

    // add code here (or in a base class) to clear the screen (once) each loop 

    ShapeRenderer shapeRenderer=new ShapeRenderer(); 
    shapeRenderer.setProjectionMatrix(cam.combined); 
    shapeRenderer.begin(ShapeRenderer.ShapeType.Line); 
    shapeRenderer.setColor(Color.BLACK); 
    shapeRenderer.line(startPt, movingPt); 
    shapeRenderer.end(); 
}