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import QtQuick 2.0
SketchView {
id: area
autoRepaint: false
property color fingerLineColor: Qt.rgba(1.0, 0.0, 0.0, 1.0)
property color stylusLineColor: Qt.rgba(0.0, 0.0, 0.0, 1.0)
property color eraserLineColor: Qt.rgba(1.0, 1.0, 1.0, 1.0)
property real curLineWidth: 4
function _boundingBox(points) {
if (!points.length) return Qt.rect(0, 0, 0, 0);
var x1 = points[0].x, y1 = points[0].y;
var x2 = x1, y2 = y1;
for (var i = 1; i < points.length; i++) {
if (points[i].x < x1) x1 = points[i].x;
if (points[i].y < y1) y1 = points[i].y;
if (points[i].x > x2) x2 = points[i].x;
if (points[i].y > y2) y2 = points[i].y;
}
return Qt.rect(x1, y1, x2 - x1, y2 - y1);
}
function _isStylusOn() {
return stylus.pressure > 0.15;
}
function _isEraserOn() {
return !_isStylusOn() && stylus.y > 0.85;
}
MouseArea {
anchors.fill: parent
preventStealing: true
onPressed: {
var point = Qt.point(mouse.x, mouse.y);
var stroke = {
lineWidth : curLineWidth,
lineColor : fingerLineColor,
stylus : false,
eraser : false,
boundingBox : Qt.rect(0, 0, area.width, area.height),
points : [point]
}
strokes.push(stroke);
canvas.requestPaint();
}
onReleased: {
canvas.requestPaint();
}
onPositionChanged: {
var cur_stroke = strokes[area.strokes.length - 1];
var point = Qt.point(mouse.x, mouse.y);
var prev_point = cur_stroke.points[cur_stroke.points.length - 1];
cur_stroke.points.push(point);
cur_stroke.boundingBox = _boundingBox(cur_stroke.points);
var rect = Qt.rect(Math.floor(Math.min(point.x, prev_point.x) - cur_stroke.lineWidth/2),
Math.floor(Math.min(point.y, prev_point.y) - cur_stroke.lineWidth/2),
Math.ceil(Math.abs(point.x - prev_point.x) + cur_stroke.lineWidth),
Math.ceil(Math.abs(point.y - prev_point.y) + cur_stroke.lineWidth));
if (!cur_stroke.stylus) {
if (_isStylusOn()) {
cur_stroke.stylus = true;
cur_stroke.lineColor = stylusLineColor;
canvas.requestPaint();
return;
} else if (_isEraserOn()) {
cur_stroke.stylus = true;
cur_stroke.eraser = true;
cur_stroke.lineColor = eraserLineColor;
canvas.requestPaint();
return;
}
}
canvas.markDirty(rect);
}
}
}
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