sigma/rendering/webgl/shaders/edge.arrowHead.vert.glsl.js

A JavaScript library dedicated to graph drawing.

(()=>{"use strict";var a={d:(n,t)=>{for(var o in t)a.o(t,o)&&!a.o(n,o)&&Object.defineProperty(n,o,{enumerable:!0,get:t[o]})},o:(a,n)=>Object.prototype.hasOwnProperty.call(a,n),r:a=>{"undefined"!=typeof Symbol&&Symbol.toStringTag&&Object.defineProperty(a,Symbol.toStringTag,{value:"Module"}),Object.defineProperty(a,"__esModule",{value:!0})}},n={};a.r(n),a.d(n,{default:()=>t});const t="attribute vec2 a_position;\nattribute vec2 a_normal;\nattribute float a_thickness;\nattribute float a_radius;\nattribute vec4 a_color;\nattribute vec3 a_barycentric;\n\nuniform mat3 u_matrix;\nuniform float u_scale;\nuniform float u_cameraRatio;\nuniform float u_viewportRatio;\nuniform float u_thicknessRatio;\n\nvarying vec4 v_color;\n\nconst float arrowHeadLengthThicknessRatio = 2.5;\nconst float arrowHeadWidthLengthRatio = 0.66;\nconst float minThickness = 0.8;\nconst float bias = 255.0 / 254.0;\n\nvoid main() {\n\n  // Computing thickness in screen space:\n  float thickness = a_thickness * u_thicknessRatio * u_scale * u_viewportRatio / 2.0;\n  thickness = max(thickness, minThickness * u_viewportRatio);\n\n  float nodeRadius = a_radius * u_thicknessRatio * u_viewportRatio * u_cameraRatio;\n  float arrowHeadLength = thickness * 2.0 * arrowHeadLengthThicknessRatio * u_cameraRatio;\n  float arrowHeadHalfWidth = arrowHeadWidthLengthRatio * arrowHeadLength / 2.0;\n\n  float da = a_barycentric.x;\n  float db = a_barycentric.y;\n  float dc = a_barycentric.z;\n\n  vec2 delta = vec2(\n      da * ((nodeRadius) * a_normal.y)\n    + db * ((nodeRadius + arrowHeadLength) * a_normal.y + arrowHeadHalfWidth * a_normal.x)\n    + dc * ((nodeRadius + arrowHeadLength) * a_normal.y - arrowHeadHalfWidth * a_normal.x),\n\n      da * (-(nodeRadius) * a_normal.x)\n    + db * (-(nodeRadius + arrowHeadLength) * a_normal.x + arrowHeadHalfWidth * a_normal.y)\n    + dc * (-(nodeRadius + arrowHeadLength) * a_normal.x - arrowHeadHalfWidth * a_normal.y)\n  );\n\n  vec2 position = (u_matrix * vec3(a_position + delta, 1)).xy;\n\n  gl_Position = vec4(position, 0, 1);\n\n  // Extract the color:\n  v_color = a_color;\n  v_color.a *= bias;\n}\n";module.exports=n})();