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Diffstat (limited to 'frontend/_shared/math/line2.js')
| -rw-r--r-- | frontend/_shared/math/line2.js | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/frontend/_shared/math/line2.js b/frontend/_shared/math/line2.js new file mode 100644 index 0000000..d8ab096 --- /dev/null +++ b/frontend/_shared/math/line2.js @@ -0,0 +1,49 @@ +/// <reference path="vec2.js" /> +/// <reference path="mat4.js" /> + +/** + * Creates a new line object + * @param {vec2} pStart + * @param {vec2} pEnd + * @param {WebGLRenderingContext} pGl + */ +function line2(pStart, pEnd, pGl, pColor, pThickness) { + const lDiffVector = subVec2(pEnd, pStart); + + const lBuffer = pGl.createBuffer(); + pGl.bindBuffer(pGl.ARRAY_BUFFER, lBuffer); + + var lBufferedData = [ + pStart.x, pStart.y, pColor.x, pColor.y, pColor.z, pColor.w, + pEnd.x, pEnd.y, pColor.x, pColor.y, pColor.z, pColor.w + ]; + + pGl.bufferData(pGl.ARRAY_BUFFER, new Float32Array(lBufferedData), pGl.STATIC_DRAW) + pGl.bindBuffer(pGl.ARRAY_BUFFER, undefined); + + var lSlope = (pEnd.y - pStart.y) / (pEnd.x - pStart.x); + + return { + buffer: lBuffer, + start: pStart, + end: pEnd, + slope: lSlope, + angle: Math.atan(lSlope), + length: length2(lDiffVector), + direction: normalize2(lDiffVector) + }; +} + +function renderLine2(pGl, pProgramInfo, pLine) { + pGl.uniformMatrix4fv(pProgramInfo.uniformLocations.model, false, mat4()); // Model on a line is always default matrix + pGl.bindBuffer(pGl.ARRAY_BUFFER, pLine.buffer); + { + pGl.enableVertexAttribArray(pProgramInfo.attributeLocations.position); + pGl.vertexAttribPointer(pProgramInfo.attributeLocations.position, 2, pGl.FLOAT, false, BYTES_PER_FLOAT * 6, 0); + + pGl.enableVertexAttribArray(pProgramInfo.attributeLocations.color); + pGl.vertexAttribPointer(pProgramInfo.attributeLocations.color, 4, pGl.FLOAT, false, BYTES_PER_FLOAT * 6, BYTES_PER_FLOAT * 2); + } + + pGl.drawArrays(pGl.LINES, 0, 2); +}
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