javascript 场景的React Three Fiber等效物,add()-带有React Three Fiber的2D文本精灵

0lvr5msh  于 2023-02-18  发布在  Java
关注(0)|答案(2)|浏览(108)

接下来:three.js 2D Text sprite labels
我发现了如何在three.js二维文本精灵,我需要它的React三纤维现在。
我的索引上有这个。js:

<Canvas 
        gl={{}}
          orthographic camera={{zoom: 20, position: [28, 22, 26]}}
          color={'#FF3333'}
          >
          <ambientLight />
          <pointLight position={[0, 10, 30]} />
          <Box   className="boxMesh" color={'#FF3333'} active={active} setActive={setActive} position={[-1, 0, 10]} />
          <Text position={[-4, -4, 10]}   />
          <Controls />
        </Canvas>

盒子工作正常,文本我不知道如何转换的代码在react三纤维,Text.js

function Text(props) {
    // This reference will give us direct access to the mesh
    const mesh = useRef()

    function makeTextSprite( message, parameters )
    {
        if ( parameters === undefined ) parameters = {};
        var fontface = parameters.hasOwnProperty("fontface") ? parameters["fontface"] : "Arial";
        var fontsize = parameters.hasOwnProperty("fontsize") ? parameters["fontsize"] : 18;
        var borderThickness = parameters.hasOwnProperty("borderThickness") ? parameters["borderThickness"] : 4;
        var borderColor = parameters.hasOwnProperty("borderColor") ?parameters["borderColor"] : { r:0, g:0, b:0, a:1.0 };
        var backgroundColor = parameters.hasOwnProperty("backgroundColor") ?parameters["backgroundColor"] : { r:255, g:255, b:255, a:1.0 };
        var textColor = parameters.hasOwnProperty("textColor") ?parameters["textColor"] : { r:0, g:0, b:0, a:1.0 };

        var canvas = document.createElement('canvas');
        var context = canvas.getContext('2d');
        context.font = "Bold " + fontsize + "px " + fontface;
        var metrics = context.measureText( message );
        var textWidth = metrics.width;

        context.fillStyle   = "rgba(" + backgroundColor.r + "," + backgroundColor.g + "," + backgroundColor.b + "," + backgroundColor.a + ")";
        context.strokeStyle = "rgba(" + borderColor.r + "," + borderColor.g + "," + borderColor.b + "," + borderColor.a + ")";

        context.lineWidth = borderThickness;
        roundRect(context, borderThickness/2, borderThickness/2, (textWidth + borderThickness) * 1.1, fontsize * 1.4 + borderThickness, 8);

        context.fillStyle = "rgba("+textColor.r+", "+textColor.g+", "+textColor.b+", 1.0)";
        context.fillText( message, borderThickness, fontsize + borderThickness);

        var texture = new THREE.Texture(canvas) 
        texture.needsUpdate = true;

        var spriteMaterial = new THREE.SpriteMaterial( { map: texture, useScreenCoordinates: false } );
        var sprite = new THREE.Sprite( spriteMaterial );
    }

    function roundRect(ctx, x, y, w, h, r) { ctx.beginPath(); ctx.moveTo(x + r, y); ctx.lineTo(x + w - r, y); ctx.quadraticCurveTo(x + w, y, x + w, y + r); ctx.lineTo(x + w, y + h - r); ctx.quadraticCurveTo(x + w, y + h, x + w - r, y + h); ctx.lineTo(x + r, y + h); ctx.quadraticCurveTo(x, y + h, x, y + h - r); ctx.lineTo(x, y + r); ctx.quadraticCurveTo(x, y, x + r, y); ctx.closePath(); ctx.fill(); ctx.stroke(); }

    return (
        <>
      <mesh 
      sprite={makeTextSprite('text')}
        {...props}
        ref={mesh}
        className="text"
        >
       
        
      </mesh>
      </>
      
    )
  }



export default Text

如果我可以在我的画布上使用scene.add,我只需要使用makeTextSprite函数就可以轻松地添加它,但是我需要作为文本组件添加,我该怎么做呢?

i5desfxk

i5desfxk1#

找到了一个临时的解决方案,不是那么糟糕,但文本有点颗粒感...(下面的版本2看起来更好,但使用另一个库)

    • 第1版**
function Text({ children, position, opacity, color = 'black', fontSize = 35 }) {

  

  const canvas = useMemo(() => {
    var fontface = "Arial";
    var fontsize = fontSize;
    var borderThickness =  4;

    var canvas = document.createElement('canvas');
    var context = canvas.getContext('2d');
    context.textBaseline = 'middle'
    context.font = `bold ${fontSize}px -apple-system, BlinkMacSystemFont, avenir next, avenir, helvetica neue, helvetica, ubuntu, roboto, noto, segoe ui, arial, sans-serif`

    var metrics = context.measureText( children );
  var textWidth = metrics.width;
  
    context.lineWidth = borderThickness;

    context.fillStyle = color
    context.fillText( children, textWidth - (textWidth*0.8), fontsize);    
    return canvas
  }, [children])

  return (
    <sprite 
    scale={[5, 3, 3]} position={position}>
      <spriteMaterial attach="material" transparent alphaTest={0.5} >
        <canvasTexture attach="map" image={canvas} />
      </spriteMaterial>
    </sprite>
  )
}

export default Text
<Text opacity={1} position={[8, 2.5, 10]}>Text Content</Text>
    • 第2版**

文本看起来更好,保持比例上的低值,并通过更改fontSize更改尺寸
一个二个一个一个

ttcibm8c

ttcibm8c2#

你可以使用react-three/drei库来获得更好的文本质量,它使用msdf创建文本。

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