Spline, multiline, cli and pre/postfix suport

README.md

@@ -25,7 +25,7 @@ Prebuilt single-file binaries (PyInstaller):
 ![License](https://img.shields.io/badge/License-MIT-yellow)
 
 ## Overview
-Text2Gcode converts a single line of text into basic G-code moves (G0/G1) suitable for pen plotters, light engraving, or CNC simulation. It offers font selection, automatic size fitting, adjustable line width preview, and direct export.
+Text2Gcode converts a single line of text into basic G-code moves (G0/G1/G5) suitable for pen plotters, light engraving, or CNC simulation. It offers font selection, automatic size fitting, adjustable line width preview, and direct export.
 
 ## Features
 - System font selection (Qt `QFontComboBox`)
@@ -40,7 +40,7 @@ Text2Gcode converts a single line of text into basic G-code moves (G0/G1) suitab
 ## How It Works
 1. Text is converted to a `QPainterPath`
 2. Path geometry is scaled (default: `0.1` units → mm)
-3. Each path element is emitted as rapid (`G0`) or linear (`G1`) move
+3. Each path element is emitted as rapid (`G0`), linear (`G1`) or cubic spline (`G5`) move
 4. Pen up/down simulated via Z moves (`safe_z` / `cut_z`)
 5. Output ends with `M2`
 
@@ -109,4 +109,4 @@ Copyright © 2025.
 📡 vy 73 de OE7SET
 
 ---
-Enjoy precise text-to-gcode conversion with a minimal, transparent codebase.
+Enjoy precise text-to-gcode conversion with a minimal, transparent codebase.

src/helper.py

@@ -0,0 +1,99 @@
+import sys
+import os
+from PySide6.QtCore import Qt
+from PySide6.QtGui import QFont, QFontMetrics, QPainterPath
+
+# Helper function: Convert text to path
+def text_to_path(text, font_family="Arial", font_size=50):
+    font = QFont(font_family, font_size)
+    font_metrics = QFontMetrics(font)
+    line_spacing = font_metrics.lineSpacing();
+    #print(f"Spacing {font_metrics.lineSpacing()}", file=sys.stderr)
+    path = QPainterPath()
+    text_split=text.splitlines()
+    n_lines=len(text_split);
+    for i in range(n_lines):
+        #print(f"Text {i} {text_nl[i]}", file=sys.stderr)
+        path.addText(0, (i-n_lines+1)*line_spacing, font, text_split[i])
+    return path
+
+def elem2xy(elem: QPainterPath.Element, scale=0.1, x_offset=0.0, y_offset=0.0):
+    #print(elem.type, file=sys.stderr)
+    #print(elem.x, file=sys.stderr)
+    #print(elem.y, file=sys.stderr)
+    x = elem.x * scale + x_offset
+    y = -elem.y * scale + y_offset  # Invert Y-axis for CNC
+    return [x, y]
+
+# Helper function: Convert path to G-Code
+def path_to_gcode(path: QPainterPath, scale=0.1, safe_z=5.0, cut_z=0.0, feedrate=500,
+                 x_offset=0.0, y_offset=0.0, z_offset=0.0, use_g5=True, g_prefix=[""], g_postfix=[""]):
+    gcode = g_prefix
+
+    if path.elementCount() == 0:
+        return "\n".join(gcode)
+
+    pen_down = True #Stat with pen_down so first move is up to save position
+
+    i = 0
+    while i < path.elementCount():
+        elem = path.elementAt(i)
+
+        if elem.isMoveTo():
+            if pen_down:
+                gcode.append(f"G0 Z{safe_z + z_offset:.2f}")  # Pen up
+                pen_down = False
+            [x0, y0] = elem2xy(elem, scale, x_offset, y_offset)
+            gcode.append(f"G0 X{x0:.2f} Y{y0:.2f}")  # Position
+
+        elif elem.isLineTo():  # LineTo
+            assert(i != 0) #First should be move to
+            if not pen_down:
+                gcode.append(f"G1 Z{cut_z + z_offset:.2f} F{feedrate}")  # Pen down
+                pen_down = True
+            [x0, y0] = elem2xy(elem, scale, x_offset, y_offset)
+            gcode.append(f"G1 X{x0:.2f} Y{y0:.2f} F{feedrate}")
+
+        elif elem.isCurveTo():  # CurveTo
+            assert(i != 0) #First should be move to
+            if not pen_down:
+                gcode.append(f"G1 Z{cut_z + z_offset:.2f} F{feedrate}")  # Pen down
+                pen_down = True
+
+            # See: https://doc.qt.io/qt-6/qpainterpath.html#cubicTo
+            # and https://linuxcnc.org/docs/html/gcode/g-code.html#gcode:g5
+
+            #x0, y0: Start is given by last element
+            [x1, y1] = elem2xy(elem, scale, x_offset, y_offset) #c1
+
+            i=i+1;
+            elem = path.elementAt(i)
+            assert(elem.type == QPainterPath.CurveToDataElement) #CurveTo is always followed by two CurveToDataElement
+            [x2, y2] = elem2xy(elem, scale, x_offset, y_offset) #c2
+
+            i=i+1;
+            elem = path.elementAt(i)
+            assert(elem.type == QPainterPath.CurveToDataElement) #CurveTo is always followed by two CurveToDataElement
+            [x3, y3] = elem2xy(elem, scale, x_offset, y_offset) #end
+
+            if use_g5:
+                gcode.append(f"G5 I{x1-x0:.2f} J{y1-y0:.2f} P{x2-x3:.2f} Q{y2-y3:.2f} X{x3:.2f} Y{y3:.2f} F{feedrate}")
+            else:
+                #Just move trough control points, looks better, even if it is basicaly wrong
+                #ToDo: Do interpolation somehow?
+                gcode.append(f"G1 X{x1:.2f} Y{y1:.2f} F{feedrate}")
+                gcode.append(f"G1 X{x2:.2f} Y{y2:.2f} F{feedrate}")
+                gcode.append(f"G1 X{x3:.2f} Y{y3:.2f} F{feedrate}")
+
+            #End is next start for spline
+            x0=x3
+            y0=y3
+
+        i=i+1
+
+    if pen_down:
+        gcode.append(f"G0 Z{safe_z + z_offset:.2f}")  # Pen up at the end
+
+    gcode = gcode + g_postfix
+
+    return "\n".join(gcode)

src/main.py

@@ -1,5 +1,6 @@
 import sys
 import os
+from helper import text_to_path, path_to_gcode
 from PySide6.QtCore import QSize, Qt, QTimer
 from PySide6.QtGui import QColor, QFont, QPainter, QPainterPath, QPen, QIcon
 from PySide6.QtWidgets import (
@@ -23,54 +24,6 @@
     QGridLayout
 )
 
-
-# Helper function: Convert text to path
-def text_to_path(text, font_family="Arial", font_size=50):
-    font = QFont(font_family, font_size)
-    path = QPainterPath()
-    path.addText(0, 0, font, text)
-    return path
-
-
-# Helper function: Convert path to G-Code
-def path_to_gcode(path: QPainterPath, scale=0.1, safe_z=5.0, cut_z=0.0, feedrate=500,
-                 x_offset=0.0, y_offset=0.0, z_offset=0.0):
-    gcode = [
-        "G21 ; mm mode",
-        "G90 ; absolute positioning"
-    ]
-
-    if path.elementCount() == 0:
-        return "\n".join(gcode)
-
-    pen_down = False
-
-    for i in range(path.elementCount()):
-        elem = path.elementAt(i)
-
-        x = elem.x * scale + x_offset
-        y = -elem.y * scale + y_offset  # Invert Y-axis for CNC
-
-        if elem.type == QPainterPath.ElementType.MoveToElement:
-            if pen_down:
-                gcode.append(f"G0 Z{safe_z + z_offset:.2f}")  # Pen up
-                pen_down = False
-            gcode.append(f"G0 X{x:.2f} Y{y:.2f}")  # Position
-
-        else:  # LineTo or CurveTo
-            if not pen_down:
-                gcode.append(f"G1 Z{cut_z + z_offset:.2f} F{feedrate}")  # Pen down
-                pen_down = True
-            gcode.append(f"G1 X{x:.2f} Y{y:.2f} F{feedrate}")
-
-    if pen_down:
-        gcode.append(f"G0 Z{safe_z + z_offset:.2f}")  # Pen up at the end
-
-    gcode.append("M2 ; Program end")
-    return "\n".join(gcode)
-
-
-
 class PreviewWidget(QWidget):
     def __init__(self):
         super().__init__()
@@ -162,7 +115,7 @@ def __init__(self):
 
         # Text input field
         text_label = QLabel("Enter Text:")
-        self.text_input = QLineEdit()
+        self.text_input = QTextEdit()
         self.text_input.setPlaceholderText("Type your text here...")
         input_layout.addWidget(text_label)
         input_layout.addWidget(self.text_input)
@@ -340,7 +293,7 @@ def update_line_width(self):
         self.preview.set_line_width(self.line_width_spin.value())
 
     def generate_gcode(self):
-        text = self.text_input.text()
+        text = self.text_input.toPlainText()
         if not text.strip():
             self.status_bar.showMessage("Please enter some text", 3000)
             return
@@ -396,8 +349,21 @@ def generate_gcode(self):
         height_mm = bounds.height() * scale
         self.dimensions_label.setText(f"Dimensions: {width_mm:.2f} x {height_mm:.2f} mm")
 
+        g_prefix = [
+            # Information
+            "; Text = " + "\\n".join(text.splitlines()),
+            f"; Dimensions: {width_mm:.2f} x {height_mm:.2f} mm",
+            # Prefix
+            "G21 ; mm mode",
+            "G90 ; absolute positioning"
+        ]
+        g_postfix = [
+            "M2 ; Program end"
+        ]
+
         gcode = path_to_gcode(path, scale=scale,
-                              x_offset=x_offset, y_offset=y_offset, z_offset=z_offset, feedrate=feedrate)
+                              x_offset=x_offset, y_offset=y_offset, z_offset=z_offset, feedrate=feedrate,
+                              g_prefix=g_prefix, g_postfix=g_postfix)
         self.gcode_preview.setPlainText(gcode)
 
         self.status_bar.showMessage("G-code generated successfully", 3000)
@@ -416,7 +382,7 @@ def save_gcode(self):
             return
 
         # Default name from LineEdit text
-        default_name = self.text_input.text().strip()
+        default_name = self.text_input.toPlainText().strip().replace("\n", " ")
         if not default_name:
             default_name = "gcode"
 

src/main_cli.py

@@ -0,0 +1,57 @@
+import sys
+import os
+from PySide6.QtWidgets import (
+    QApplication
+)
+
+from helper import text_to_path, path_to_gcode
+
+if __name__ == "__main__":
+    app = QApplication(sys.argv)
+
+    if len(sys.argv) != 4 and len(sys.argv) != 10:
+        print("Usage: main_cli.py font fontsize text [x y z feed gcode_prefix gcode_postfix]", file=sys.stderr)
+        sys.exit(-1)
+
+    font_family = sys.argv[1]
+    font_size = float(sys.argv[2])
+    scale = 0.1  # Same scale as in path_to_gcode
+
+    text = sys.argv[3]
+
+    # Get offset and feedrate values
+    if len(sys.argv) == 10:
+        x_offset = float(sys.argv[4])
+        y_offset = float(sys.argv[5])
+        z_offset = float(sys.argv[6])
+        feedrate = float(sys.argv[7])
+        g_prefix =  sys.argv[8].splitlines()
+        g_postfix = sys.argv[9].splitlines()
+    else:
+        x_offset = 0
+        y_offset = 0
+        z_offset = 0
+        feedrate = 500
+        g_prefix = [
+            "G21 ; mm mode",
+            "G90 ; absolute positioning"
+        ]
+        g_postfix = [
+            "M2 ; Program end"
+        ]
+
+    path = text_to_path(text, font_family=font_family, font_size=font_size)
+
+    # Calculate dimensions
+    bounds = path.boundingRect()
+    width_mm = bounds.width() * scale
+    height_mm = bounds.height() * scale
+
+    # Add information
+    g_prefix = ["; Text = " + "\\n".join(text.splitlines()), f"; Dimensions: {width_mm:.2f} x {height_mm:.2f} mm"] + g_prefix;
+
+    gcode = path_to_gcode(path, scale=scale,
+                          x_offset=x_offset, y_offset=y_offset, z_offset=z_offset, feedrate=feedrate,
+                          g_prefix=g_prefix, g_postfix=g_postfix)
+
+    print(gcode)