pixi.js

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{"version":3,"file":"buildCircle.mjs","sources":["../../../../../src/scene/graphics/shared/buildCommands/buildCircle.ts"],"sourcesContent":["import { ExtensionType } from '../../../../extensions/Extensions';\n\nimport type { Circle } from '../../../../maths/shapes/Circle';\nimport type { Ellipse } from '../../../../maths/shapes/Ellipse';\nimport type { RoundedRectangle } from '../../../../maths/shapes/RoundedRectangle';\nimport type { ShapeBuildCommand } from './ShapeBuildCommand';\n\n/** @internal */\ntype RoundedShape = Circle | Ellipse | RoundedRectangle;\n\n/**\n * Builds a rectangle to draw\n *\n * Ignored from docs since it is not directly exposed.\n * @internal\n */\nexport const buildCircle: ShapeBuildCommand<RoundedShape> = {\n extension: {\n type: ExtensionType.ShapeBuilder,\n name: 'circle',\n },\n\n build(shape: RoundedShape, points: number[]): boolean\n {\n let x;\n let y;\n let dx;\n let dy;\n\n let rx;\n let ry;\n\n if (shape.type === 'circle')\n {\n const circle = shape as Circle;\n\n rx = ry = circle.radius;\n if (rx <= 0)\n {\n return false;\n }\n x = circle.x;\n y = circle.y;\n dx = dy = 0;\n }\n\n else if (shape.type === 'ellipse')\n {\n const ellipse = shape as Ellipse;\n\n rx = ellipse.halfWidth;\n ry = ellipse.halfHeight;\n if (rx <= 0 || ry <= 0)\n { // skip zero ellipse\n return false;\n }\n x = ellipse.x;\n y = ellipse.y;\n dx = dy = 0;\n }\n else\n {\n const roundedRect = shape as RoundedRectangle;\n const halfWidth = roundedRect.width / 2;\n const halfHeight = roundedRect.height / 2;\n\n x = roundedRect.x + halfWidth;\n y = roundedRect.y + halfHeight;\n rx = ry = Math.max(0, Math.min(roundedRect.radius, Math.min(halfWidth, halfHeight)));\n dx = halfWidth - rx;\n dy = halfHeight - ry;\n }\n\n if (dx < 0 || dy < 0)\n {\n return false;\n }\n\n // Choose a number of segments such that the maximum absolute deviation from the circle is approximately 0.029\n const n = Math.ceil(2.3 * Math.sqrt(rx + ry));\n const m = (n * 8) + (dx ? 4 : 0) + (dy ? 4 : 0);\n\n if (m === 0)\n {\n return false;\n }\n\n if (n === 0)\n {\n points[0] = points[6] = x + dx;\n points[1] = points[3] = y + dy;\n points[2] = points[4] = x - dx;\n points[5] = points[7] = y - dy;\n\n return true;\n }\n\n let j1 = 0;\n let j2 = (n * 4) + (dx ? 2 : 0) + 2;\n let j3 = j2;\n let j4 = m;\n\n let x0 = dx + rx;\n let y0 = dy;\n let x1 = x + x0;\n let x2 = x - x0;\n let y1 = y + y0;\n\n points[j1++] = x1;\n points[j1++] = y1;\n points[--j2] = y1;\n points[--j2] = x2;\n\n if (dy)\n {\n const y2 = y - y0;\n\n points[j3++] = x2;\n points[j3++] = y2;\n points[--j4] = y2;\n points[--j4] = x1;\n }\n\n for (let i = 1; i < n; i++)\n {\n const a = Math.PI / 2 * (i / n);\n const x0 = dx + (Math.cos(a) * rx);\n const y0 = dy + (Math.sin(a) * ry);\n const x1 = x + x0;\n const x2 = x - x0;\n const y1 = y + y0;\n const y2 = y - y0;\n\n points[j1++] = x1;\n points[j1++] = y1;\n points[--j2] = y1;\n points[--j2] = x2;\n points[j3++] = x2;\n points[j3++] = y2;\n points[--j4] = y2;\n points[--j4] = x1;\n }\n\n x0 = dx;\n y0 = dy + ry;\n x1 = x + x0;\n x2 = x - x0;\n y1 = y + y0;\n const y2 = y - y0;\n\n points[j1++] = x1;\n points[j1++] = y1;\n points[--j4] = y2;\n points[--j4] = x1;\n\n if (dx)\n {\n points[j1++] = x2;\n points[j1++] = y1;\n points[--j4] = y2;\n points[--j4] = x2;\n }\n\n return true;\n },\n\n triangulate(points, vertices, verticesStride, verticesOffset, indices, indicesOffset)\n {\n if (points.length === 0)\n {\n return;\n }\n\n // Compute center (average of all points)\n let centerX = 0; let\n centerY = 0;\n\n for (let i = 0; i < points.length; i += 2)\n {\n centerX += points[i];\n centerY += points[i + 1];\n }\n centerX /= (points.length / 2);\n centerY /= (points.length / 2);\n\n // Set center vertex\n let count = verticesOffset;\n\n vertices[count * verticesStride] = centerX;\n vertices[(count * verticesStride) + 1] = centerY;\n const centerIndex = count++;\n\n // Set edge vertices and indices\n for (let i = 0; i < points.length; i += 2)\n {\n vertices[count * verticesStride] = points[i];\n vertices[(count * verticesStride) + 1] = points[i + 1];\n\n if (i > 0)\n { // Skip first point for indices\n indices[indicesOffset++] = count;\n indices[indicesOffset++] = centerIndex;\n indices[indicesOffset++] = count - 1;\n }\n count++;\n }\n\n // Connect last point to the first edge point\n indices[indicesOffset++] = centerIndex + 1;\n indices[indicesOffset++] = centerIndex;\n indices[indicesOffset++] = count - 1;\n }\n\n};\n\n/** @internal */\nexport const buildEllipse = { ...buildCircle, extension: { ...buildCircle.extension, name: 'ellipse' } };\n/** @internal */\nexport const buildRoundedRectangle = { ...buildCircle, extension: { ...buildCircle.extension, name: 'roundedRectangle' } 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