flutter_package / dart_pdf

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David PHAM-VAN
8f6bf402 1 parent 182e6e96

Implement drawShape

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Showing 3 changed files with 149 additions and 16 deletions
... ... @@ -5,6 +5,7 @@
* Fix annotations
* Implement default fonts bounding box
* Add Bézier Curve primitive
* Implement drawShape
# 1.0.8
* Fix monospace TTF font loading
... ...
... ... @@ -206,26 +206,151 @@ class PdfGraphics {
buf.putString("$x1 $y1 $x2 $y2 $x3 $y3 c\n");
}
void drawShape(String d) {
var sb = StringBuffer();
RegExp exp = RegExp(r"([MmZzLlHhVvCcSsQqTtAa])|(-[\.0-9]+)|([\.0-9]+)");
var matches = exp.allMatches(d);
var action;
/// https://github.com/deeplook/svglib/blob/master/svglib/svglib.py#L911
void drawShape(String d, {stroke = true}) {
final sb = StringBuffer();
final exp = RegExp(r"([MmZzLlHhVvCcSsQqTtAaE])|(-[\.0-9]+)|([\.0-9]+)");
final matches = exp.allMatches(d + " E");
String action;
String lastAction;
List<double> points;
PdfPoint lastControl = PdfPoint(0.0, 0.0);
PdfPoint lastPoint = PdfPoint(0.0, 0.0);
for (var m in matches) {
var a = m.group(1);
var b = m.group(0);
print("$a, $b");
if (a != null) {
if (action != null) {
sb.write("$action ");
if (a == null) {
points.add(double.parse(b));
continue;
}
if (action != null) {
switch (action) {
case 'm': // moveto relative
lastPoint =
PdfPoint(lastPoint.x + points[0], lastPoint.y + points[1]);
sb.write("${lastPoint.x} ${lastPoint.y} m ");
break;
case 'M': // moveto absolute
lastPoint = PdfPoint(points[0], points[1]);
sb.write("${lastPoint.x} ${lastPoint.y} m ");
break;
case 'l': // lineto relative
lastPoint =
PdfPoint(lastPoint.x + points[0], lastPoint.y + points[1]);
sb.write("${lastPoint.x} ${lastPoint.y} l ");
break;
case 'L': // lineto absolute
lastPoint = PdfPoint(points[0], points[1]);
sb.write("${lastPoint.x} ${lastPoint.y} l ");
break;
case 'H': // horizontal line absolute
lastPoint = PdfPoint(points[0], lastPoint.y);
sb.write("${lastPoint.x} ${lastPoint.y} l ");
break;
case 'V': // vertical line absolute
lastPoint = PdfPoint(lastPoint.x, points[0]);
sb.write("${lastPoint.x} ${lastPoint.y} l ");
break;
case 'h': // horizontal line relative
lastPoint = PdfPoint(lastPoint.x + points[0], lastPoint.y);
sb.write("${lastPoint.x} ${lastPoint.y} l ");
break;
case 'v': // vertical line relative
lastPoint = PdfPoint(lastPoint.x, lastPoint.y + points[0]);
sb.write("${lastPoint.x} ${lastPoint.y} l ");
break;
case 'C': // cubic bezier, absolute
var len = 0;
while ((len + 1) * 6 <= points.length) {
sb.write(
points.sublist(len * 6, (len + 1) * 6).join(" ") + " c ");
len += 1;
}
lastPoint =
PdfPoint(points[points.length - 2], points[points.length - 1]);
lastControl =
PdfPoint(points[points.length - 4], points[points.length - 3]);
break;
case 'S': // smooth cubic bézier, absolute
while (points.length >= 4) {
PdfPoint c1;
if ('cCsS'.indexOf(lastAction) >= 0) {
c1 = PdfPoint(lastPoint.x + (lastPoint.x - lastControl.x),
lastPoint.y + (lastPoint.y - lastControl.y));
} else {
c1 = lastPoint;
}
lastControl = PdfPoint(points[0], points[1]);
lastPoint = PdfPoint(points[2], points[3]);
sb.write(
"${c1.x} ${c1.y} ${lastControl.x} ${lastControl.y} ${lastPoint.x} ${lastPoint.y} c ");
points = points.sublist(4);
lastAction = 'C';
}
break;
case 'c': // cubic bezier, relative
var len = 0;
while ((len + 1) * 6 <= points.length) {
points[len + 0] += lastPoint.x;
points[len + 1] += lastPoint.y;
points[len + 2] += lastPoint.x;
points[len + 3] += lastPoint.y;
points[len + 4] += lastPoint.x;
points[len + 5] += lastPoint.y;
sb.write(
points.sublist(len * 6, (len + 1) * 6).join(" ") + " c ");
len += 1;
}
lastPoint =
PdfPoint(points[points.length - 2], points[points.length - 1]);
lastControl =
PdfPoint(points[points.length - 4], points[points.length - 3]);
break;
case 's': // smooth cubic bézier, relative
while (points.length >= 4) {
PdfPoint c1;
if ('cCsS'.indexOf(lastAction) >= 0) {
c1 = PdfPoint(lastPoint.x + (lastPoint.x - lastControl.x),
lastPoint.y + (lastPoint.y - lastControl.y));
} else {
c1 = lastPoint;
}
lastControl =
PdfPoint(points[0] + lastPoint.x, points[1] + lastPoint.y);
lastPoint =
PdfPoint(points[2] + lastPoint.x, points[3] + lastPoint.y);
sb.write(
"${c1.x} ${c1.y} ${lastControl.x} ${lastControl.y} ${lastPoint.x} ${lastPoint.y} c ");
points = points.sublist(4);
lastAction = 'c';
}
break;
// case 'Q': // quadratic bezier, absolute
// break;
// case 'T': // quadratic bezier, absolute
// break;
// case 'q': // quadratic bezier, relative
// break;
// case 't': // quadratic bezier, relative
// break;
// case 'A': // elliptical arc, absolute
// break;
// case 'a': // elliptical arc, relative
// break;
case 'Z': // close path
case 'z': // close path
if (stroke) sb.write("s ");
break;
default:
print("Unknown path action: $action");
}
action = a;
} else {
sb.write("$b ");
}
lastAction = action;
action = a;
points = List<double>();
}
print(sb);
buf.putString(sb.toString());
}
... ...
... ... @@ -20,12 +20,19 @@ void main() {
var page = PdfPage(pdf, pageFormat: const PdfPageFormat(500.0, 300.0));
var g = page.getGraphics();
g.saveContext();
var tm = Matrix4.identity();
tm.translate(100.0, 700.0);
tm.translate(50.0, 290.0);
tm.rotateZ(pi);
g.setTransform(tm);
// g.drawShape("M37 0H9C6.24 0 4 2.24 4 5v38c0 2.76 2.24 5 5 5h28c2.76 0 5-2.24 5-5V5c0-2.76-2.24-5-5-5zM23 46c-1.66 0-3-1.34-3-3s1.34-3 3-3 3 1.34 3 3-1.34 3-3 3zm15-8H8V6h30v32z");
g.setColor(PdfColor(0.0, 0.0, 0.0));
g.drawShape(
"M37 0H9C6.24 0 4 2.24 4 5v38c0 2.76 2.24 5 5 5h28c2.76 0 5-2.24 5-5V5c0-2.76-2.24-5-5-5zM23 46c-1.66 0-3-1.34-3-3s1.34-3 3-3 3 1.34 3 3-1.34 3-3 3zm15-8H8V6h30v32z",
stroke: false);
g.fillPath();
g.restoreContext();
var font1 = g.defaultFont;
var font2 = PdfTtfFont(
... ...