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我正在Java腳本中創建Box2d世界,但我不在其中添加任何對象。我將重力設置爲零。當我嘗試在畫布中繪製box2d對象時,如果存在,我找到一個以0,0繪製的矩形。但是,當我使用DebugDraw()時,沒有對象按預期方式顯示。有人可以解釋爲什麼額外的矩形被繪製?該代碼是下面:即使未在Box2d中添加對象,也會繪製矩形
canvas=document.getElementById("cnv");
context=canvas.getContext("2d");
x=0;
y=0;
scale=100;
gravity=new b2Vec2(0,0);
world=new b2World(gravity,false);
requestAnimFrame(main);
function main()
{
requestAnimFrame(main);
begin();
}
function begin()
{
world.Step(1/60,10,10);
drawObjects();
world.ClearForces();
}
function drawObjects()
{
canvas.width=canvas.width;
for (currentBody = world.GetBodyList(); currentBody; currentBody =currentBody.m_next)
{
position = currentBody.GetPosition();
if (currentBody.GetType() == b2Body.b2_staticBody)
{
context.fillStyle="red";
alert(position.x+" "+position.y);
context.fillRect(position.x*scale,position.y*scale,125,125);
}
}
}