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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,131 @@ | ||
| // Blocker -> Diffraction Grating | ||
| objTypes['diffractiongrating'] = { | ||
|
|
||
| // Create the obj | ||
| create: function(mouse) { | ||
| return {type: 'diffractiongrating', p1: mouse, p2: mouse, line_density: 1000, slit_ratio: 0.5, mirrored: false}; | ||
| }, | ||
|
|
||
| // Use the prototype lineobj | ||
| c_mousedown: objTypes['lineobj'].c_mousedown, | ||
| c_mousemove: objTypes['lineobj'].c_mousemove, | ||
| c_mouseup: objTypes['lineobj'].c_mouseup, | ||
| move: objTypes['lineobj'].move, | ||
| clicked: objTypes['lineobj'].clicked, | ||
| dragging: objTypes['lineobj'].dragging, | ||
|
|
||
| // Draw the obj on canvas | ||
| draw: function(obj, ctx, aboveLight) { | ||
| if (obj.mirrored) { | ||
| ctx.strokeStyle = getMouseStyle(obj, 'rgb(168,168,168)'); | ||
| ctx.beginPath(); | ||
| ctx.moveTo(obj.p1.x, obj.p1.y); | ||
| ctx.lineTo(obj.p2.x, obj.p2.y); | ||
| ctx.stroke(); | ||
| } | ||
| ctx.strokeStyle = getMouseStyle(obj, 'rgb(124,62,18)'); | ||
| ctx.lineWidth = 2; | ||
| ctx.lineCap = 'butt'; | ||
| ctx.beginPath(); | ||
| ctx.setLineDash([4*(1-obj.slit_ratio),4*obj.slit_ratio]); | ||
| ctx.moveTo(obj.p1.x, obj.p1.y); | ||
| ctx.lineTo(obj.p2.x, obj.p2.y); | ||
| ctx.stroke(); | ||
| ctx.setLineDash([]); | ||
| ctx.lineWidth = 1; | ||
| }, | ||
|
|
||
| // Show the property box | ||
| p_box: function(obj, elem) { | ||
| createNumberAttr(getMsg('lines/mm'), 1, 2500, 5, obj.line_density, function(obj, value) { | ||
| obj.line_density = value; | ||
| }, elem); | ||
|
|
||
| if (createAdvancedOptions(obj.slit_ratio != 0.5 || obj.mirrored)) { | ||
| createNumberAttr(getMsg('slit_ratio'), 0, 1, 0.001, obj.slit_ratio, function(obj, value) { | ||
| obj.slit_ratio = value; | ||
| }, elem); | ||
| createBooleanAttr(getMsg('mirrored'), obj.mirrored, function(obj, value) { | ||
| obj.mirrored = value; | ||
| }, elem); | ||
| } | ||
|
|
||
| if (mode == 'images' || mode == 'observer') { | ||
| var note = document.createElement('span'); | ||
| note.innerHTML = getMsg('image_detection_warning'); | ||
| note.id = "image_detection_warning"; | ||
| note.style.marginLeft = "0.2em"; | ||
| note.style.marginRight = "0.2em"; | ||
| note.style.color = "white"; | ||
| elem.appendChild(note); | ||
| } | ||
|
|
||
| if (!colorMode) { | ||
| var note = document.createElement('span'); | ||
| note.innerHTML = getMsg('non_color_mode_warning'); | ||
| note.id = "non_color_mode_warning"; | ||
| note.style.marginLeft = "0.2em"; | ||
| note.style.marginRight = "0.2em"; | ||
| note.style.color = "white"; | ||
| elem.appendChild(note); | ||
| } | ||
| }, | ||
|
|
||
| //Describes how the ray intersects the grating | ||
| rayIntersection: function(obj, ray) { | ||
| return objTypes['lineobj'].rayIntersection(obj, ray); | ||
| }, | ||
|
|
||
| // When the obj is shot by a ray | ||
| shot: function(diffractiongrating, ray, rayIndex, rp) { | ||
| const mm_in_nm = 1/1000000; | ||
| var rx = ray.p1.x - rp.x; | ||
| var ry = ray.p1.y - rp.y; | ||
| var mx = diffractiongrating.p2.x - diffractiongrating.p1.x; | ||
| var my = diffractiongrating.p2.y - diffractiongrating.p1.y; | ||
| ray.exist = false; | ||
|
|
||
| var wavelength = (ray.wavelength || GREEN_WAVELENGTH) * mm_in_nm; | ||
| var interval = 1/diffractiongrating.line_density; | ||
| var slit_width = interval * diffractiongrating.slit_ratio; | ||
|
|
||
| //Find which side the incoming ray is hitting the diffraction line segment | ||
| var crossProduct = rx * my - ry * mx; | ||
| var left_point = crossProduct > 0? diffractiongrating.p1 : diffractiongrating.p2; | ||
|
|
||
| //If mirrored, reflect the rays rather than pass them | ||
| var mirror = diffractiongrating.mirrored? -1 : 1; | ||
|
|
||
| //Find angles | ||
| var theta_left = Math.PI - Math.atan2(left_point.y - rp.y,left_point.x - rp.x); | ||
| var theta_i = Math.PI - Math.atan2(ry,rx); | ||
| var incidence_angle = Math.PI/2 - (theta_left < theta_i? theta_left + 2 * Math.PI - theta_i : theta_left - theta_i); | ||
|
|
||
| var m_min = -Math.floor(interval/wavelength*(1-Math.sin(incidence_angle))); | ||
| var m_max = -Math.ceil(interval/wavelength*(-1-Math.sin(incidence_angle))); | ||
|
|
||
| for (var m = m_min; m <= m_max; m++) { | ||
| var diffracted_angle = Math.asin(Math.sin(incidence_angle) - m * wavelength / interval); | ||
|
|
||
| var rot_c = Math.cos(mirror * (-Math.PI/2 - diffracted_angle)); | ||
| var rot_s = Math.sin(mirror * (-Math.PI/2 - diffracted_angle)); | ||
| var diffracted_ray = graphs.ray(rp, graphs.point(rp.x + (left_point.x-rp.x) * rot_c - (left_point.y-rp.y) * rot_s, rp.y + (left_point.x-rp.x) * rot_s + (left_point.y-rp.y) * rot_c)); | ||
|
|
||
| var phase_diff = 2 * Math.PI * slit_width / wavelength * (Math.sin(incidence_angle) - Math.sin(diffracted_angle)) | ||
| var sinc_arg = (phase_diff == 0)? 1 : Math.sin(phase_diff/2) / (phase_diff/2); | ||
| var intensity = slit_width*slit_width/(interval*interval) * Math.pow(sinc_arg, 2); | ||
|
|
||
| if (m==0) { | ||
| console.log(intensity) | ||
| } | ||
| diffracted_ray.wavelength = ray.wavelength; | ||
| diffracted_ray.brightness_s = ray.brightness_s * intensity; | ||
| diffracted_ray.brightness_p = ray.brightness_p * intensity; | ||
|
|
||
| // There is currently no good way to make image detection work here. So just set gap to true to disable image detection for the diffracted rays. | ||
| diffracted_ray.gap = true; | ||
|
|
||
| addRay(diffracted_ray); | ||
| } | ||
| }, | ||
| }; |
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