117 lines
4.5 KiB
C++
117 lines
4.5 KiB
C++
#include "Flow.hpp"
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#include <cmath>
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#include <assert.h>
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namespace Slic3r {
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/* This constructor builds a Flow object from an extrusion width config setting
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and other context properties. */
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Flow
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Flow::new_from_config_width(FlowRole role, const ConfigOptionFloatOrPercent &width, float nozzle_diameter, float height, float bridge_flow_ratio) {
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// we need layer height unless it's a bridge
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if (height <= 0 && bridge_flow_ratio == 0) CONFESS("Invalid flow height supplied to new_from_config_width()");
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float w;
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if (bridge_flow_ratio > 0) {
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// if bridge flow was requested, calculate bridge width
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height = w = Flow::_bridge_width(nozzle_diameter, bridge_flow_ratio);
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} else if (!width.percent && width.value == 0) {
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// if user left option to 0, calculate a sane default width
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w = Flow::_auto_width(role, nozzle_diameter, height);
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} else {
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// if user set a manual value, use it
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w = width.get_abs_value(height);
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}
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return Flow(w, height, nozzle_diameter, bridge_flow_ratio > 0);
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}
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/* This constructor builds a Flow object from a given centerline spacing. */
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Flow
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Flow::new_from_spacing(float spacing, float nozzle_diameter, float height, bool bridge) {
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// we need layer height unless it's a bridge
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if (height <= 0 && !bridge) CONFESS("Invalid flow height supplied to new_from_spacing()");
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float w = Flow::_width_from_spacing(spacing, nozzle_diameter, height, bridge);
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if (bridge) height = w;
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return Flow(w, height, nozzle_diameter, bridge);
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}
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/* This method returns the centerline spacing between two adjacent extrusions
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having the same extrusion width (and other properties). */
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float
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Flow::spacing() const
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{
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#ifdef HAS_PERIMETER_LINE_OVERLAP
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if (this->bridge)
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return this->width + BRIDGE_EXTRA_SPACING;
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// rectangle with semicircles at the ends
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float min_flow_spacing = this->width - this->height * (1 - PI/4.0);
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return this->width - PERIMETER_LINE_OVERLAP_FACTOR * (this->width - min_flow_spacing);
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#else
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return this->bridge ? (this->width + BRIDGE_EXTRA_SPACING) : (this->width - this->height * (1 - PI/4.0));
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#endif
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}
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/* This method returns the centerline spacing between an extrusion using this
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flow and another one using another flow.
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this->spacing(other) shall return the same value as other.spacing(*this) */
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float
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Flow::spacing(const Flow &other) const {
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assert(this->height == other.height);
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assert(this->bridge == other.bridge);
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return this->bridge ?
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0.5f * this->width + 0.5f * other.width + BRIDGE_EXTRA_SPACING :
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0.5f * this->spacing() + 0.5f * other.spacing();
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}
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/* This method returns extrusion volume per head move unit. */
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double Flow::mm3_per_mm() const
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{
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return this->bridge ?
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(this->width * this->width) * PI/4.0 :
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this->width * this->height + (this->height * this->height) / 4.0 * (PI-4.0);
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}
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/* This static method returns bridge width for a given nozzle diameter. */
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float Flow::_bridge_width(float nozzle_diameter, float bridge_flow_ratio) {
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return (bridge_flow_ratio == 1.) ?
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// optimization to avoid sqrt()
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nozzle_diameter :
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sqrt(bridge_flow_ratio) * nozzle_diameter;
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}
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/* This static method returns a sane extrusion width default. */
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float Flow::_auto_width(FlowRole role, float nozzle_diameter, float height) {
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// here we calculate a sane default by matching the flow speed (at the nozzle) and the feed rate
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// shape: rectangle with semicircles at the ends
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float width = ((nozzle_diameter*nozzle_diameter) * PI + (height*height) * (4.0 - PI)) / (4.0 * height);
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float min = nozzle_diameter * 1.05;
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float max = -1;
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if (role == frExternalPerimeter || role == frSupportMaterial || role == frSupportMaterialInterface) {
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min = max = nozzle_diameter;
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} else if (role != frInfill) {
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// do not limit width for sparse infill so that we use full native flow for it
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max = nozzle_diameter * 1.7;
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}
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if (max != -1 && width > max) width = max;
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if (width < min) width = min;
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return width;
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}
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/* This static method returns the extrusion width value corresponding to the supplied centerline spacing. */
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float Flow::_width_from_spacing(float spacing, float nozzle_diameter, float height, bool bridge)
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{
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return bridge ?
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(spacing - BRIDGE_EXTRA_SPACING) :
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#ifdef HAS_PERIMETER_LINE_OVERLAP
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(spacing + PERIMETER_LINE_OVERLAP_FACTOR * height * (1 - PI/4.0));
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#else
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(spacing + height * (1 - PI/4.0));
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#endif
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}
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}
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