fix(text): layer

demos/06_text.html

@@ -37,7 +37,7 @@ scene.on('loaded', () => {
     .source(data)
     .shape('name', 'text')
     .active(true)
-    .size(48) // default 1
+    .size(12) // default 1
     .color('name')
     .style({
       stroke: '#999',

src/geom/buffer/point/text.js

@@ -29,7 +29,7 @@ function generateTextBuffer(layerData, fontAtlasManager) {
     const size = element.size;
     const pos = element.coordinates;
     let text = element.shape || '';
-    const pen = { x: -text.length * size / 2, y: 0 };
+    const pen = { x: -text.length * size / 2 + size / 2, y: 0 };
     text = text.toString();
     for (let i = 0; i < text.length; i++) {
       const metric = mapping[text[i]];

src/geom/shader/point_frag.glsl

@@ -54,7 +54,6 @@ void main() {
             return;
         }else if(dis2center>ri){
             gl_FragColor= u_stroke;
-            gl_FragColor.a = * u_stroke;
             return;
         }
     }

src/geom/shader/text_vert2.glsl

@@ -18,12 +18,12 @@ varying vec4 v_color;
 void main(){
   mat4 matModelViewProjection=projectionMatrix*modelViewMatrix;
   vec4 cur_position=matModelViewProjection*vec4(a_position.xy,0,1);
-  gl_Position=cur_position/cur_position.w+vec4(a_textSize*position.xy/u_glSize/2.,0.,0.)+vec4(a_textOffset/u_glSize,0,0);
+  gl_Position=cur_position / cur_position.w+ vec4(a_textSize*position.xy/u_glSize, 0., 0.)+vec4(a_textOffset/u_glSize * 2.0,0,0);
   v_color=vec4(a_color.rgb,a_color.a*u_opacity);
   if(pickingId == u_activeId) {
      v_color = u_activeColor;
    }
-  v_texcoord=(textUv.xy+vec2(uv.x,1.-uv.y)*textUv.zw)/u_textTextureSize;
+  v_texcoord=(textUv.xy + vec2(uv.x,1.-uv.y) * textUv.zw)/u_textTextureSize;
   worldId = id_toPickColor(pickingId);
   
 }

src/layer/render/point/drawText.js

@@ -18,8 +18,8 @@ export default function DrawText(attributes, style) {
     u_strokeWidth: strokeWidth,
     u_stroke: stroke,
     u_textTextureSize: [ attributes.fontAtlas.width, attributes.fontAtlas.height ],
-    u_gamma: 0.02,
-    u_buffer: 0.75,
+    u_gamma: 0.1,
+    u_buffer: 0.68,
     u_opacity: opacity,
     u_glSize: [ width, height ],
     u_activeColor: activeColor