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drag-helper.js
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drag-helper.js
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var dragHelper = {
global: {
prevX: 0,
prevY: 0,
ismousedown: false,
pointsToMove: 'all',
startingIndex: 0
},
mousedown: function(e) {
if (isControlKeyPressed) {
copy();
paste();
isControlKeyPressed = false;
}
var dHelper = dragHelper,
g = dHelper.global;
var x = e.pageX - canvas.offsetLeft,
y = e.pageY - canvas.offsetTop;
g.prevX = x;
g.prevY = y;
g.pointsToMove = 'all';
if (points.length) {
var p = points[points.length - 1],
point = p[1];
if (p[0] === 'line') {
if (dHelper.isPointInPath(x, y, point[0], point[1])) {
g.pointsToMove = 'head';
}
if (dHelper.isPointInPath(x, y, point[2], point[3])) {
g.pointsToMove = 'tail';
}
}
if (p[0] === 'pencil') {
if (dHelper.isPointInPath(x, y, point[0], point[1])) {
g.pointsToMove = 'head';
}
if (dHelper.isPointInPath(x, y, point[2], point[3])) {
g.pointsToMove = 'tail';
}
}
if (p[0] === 'arrow') {
if (dHelper.isPointInPath(x, y, point[0], point[1])) {
g.pointsToMove = 'head';
}
if (dHelper.isPointInPath(x, y, point[2], point[3])) {
g.pointsToMove = 'tail';
}
}
if (p[0] === 'rect') {
if (dHelper.isPointInPath(x, y, point[0], point[1])) {
g.pointsToMove = 'stretch-first';
}
if (dHelper.isPointInPath(x, y, point[0] + point[2], point[1])) {
g.pointsToMove = 'stretch-second';
}
if (dHelper.isPointInPath(x, y, point[0], point[1] + point[3])) {
g.pointsToMove = 'stretch-third';
}
if (dHelper.isPointInPath(x, y, point[0] + point[2], point[1] + point[3])) {
g.pointsToMove = 'stretch-last';
}
}
if (p[0] === 'image') {
if (dHelper.isPointInPath(x, y, point[1], point[2])) {
g.pointsToMove = 'stretch-first';
}
if (dHelper.isPointInPath(x, y, point[1] + point[3], point[2])) {
g.pointsToMove = 'stretch-second';
}
if (dHelper.isPointInPath(x, y, point[1], point[2] + point[4])) {
g.pointsToMove = 'stretch-third';
}
if (dHelper.isPointInPath(x, y, point[1] + point[3], point[2] + point[4])) {
g.pointsToMove = 'stretch-last';
}
}
if (p[0] === 'pdf') {
if (dHelper.isPointInPath(x, y, point[1], point[2])) {
g.pointsToMove = 'stretch-first';
}
if (dHelper.isPointInPath(x, y, point[1] + point[3], point[2])) {
g.pointsToMove = 'stretch-second';
}
if (dHelper.isPointInPath(x, y, point[1], point[2] + point[4])) {
g.pointsToMove = 'stretch-third';
}
if (dHelper.isPointInPath(x, y, point[1] + point[3], point[2] + point[4])) {
g.pointsToMove = 'stretch-last';
}
}
if (p[0] === 'quadratic') {
if (dHelper.isPointInPath(x, y, point[0], point[1])) {
g.pointsToMove = 'starting-points';
}
if (dHelper.isPointInPath(x, y, point[2], point[3])) {
g.pointsToMove = 'control-points';
}
if (dHelper.isPointInPath(x, y, point[4], point[5])) {
g.pointsToMove = 'ending-points';
}
}
if (p[0] === 'bezier') {
if (dHelper.isPointInPath(x, y, point[0], point[1])) {
g.pointsToMove = 'starting-points';
}
if (dHelper.isPointInPath(x, y, point[2], point[3])) {
g.pointsToMove = '1st-control-points';
}
if (dHelper.isPointInPath(x, y, point[4], point[5])) {
g.pointsToMove = '2nd-control-points';
}
if (dHelper.isPointInPath(x, y, point[6], point[7])) {
g.pointsToMove = 'ending-points';
}
}
}
g.ismousedown = true;
},
mouseup: function() {
var g = this.global;
if (is.isDragLastPath) {
tempContext.clearRect(0, 0, innerWidth, innerHeight);
context.clearRect(0, 0, innerWidth, innerHeight);
this.end();
}
g.ismousedown = false;
},
mousemove: function(e) {
var x = e.pageX - canvas.offsetLeft,
y = e.pageY - canvas.offsetTop,
g = this.global;
drawHelper.redraw();
if (g.ismousedown) {
this.dragShape(x, y);
}
if (is.isDragLastPath) this.init();
},
init: function() {
if (!points.length) return;
var p = points[points.length - 1],
point = p[1],
g = this.global;
if (g.ismousedown) tempContext.fillStyle = 'rgba(255,85 ,154,.9)';
else tempContext.fillStyle = 'rgba(255,85 ,154,.4)';
if (p[0] === 'quadratic') {
tempContext.beginPath();
tempContext.arc(point[0], point[1], 10, Math.PI * 2, 0, !1);
tempContext.arc(point[2], point[3], 10, Math.PI * 2, 0, !1);
tempContext.arc(point[4], point[5], 10, Math.PI * 2, 0, !1);
tempContext.fill();
}
if (p[0] === 'bezier') {
tempContext.beginPath();
tempContext.arc(point[0], point[1], 10, Math.PI * 2, 0, !1);
tempContext.arc(point[2], point[3], 10, Math.PI * 2, 0, !1);
tempContext.arc(point[4], point[5], 10, Math.PI * 2, 0, !1);
tempContext.arc(point[6], point[7], 10, Math.PI * 2, 0, !1);
tempContext.fill();
}
if (p[0] === 'line') {
tempContext.beginPath();
tempContext.arc(point[0], point[1], 10, Math.PI * 2, 0, !1);
tempContext.arc(point[2], point[3], 10, Math.PI * 2, 0, !1);
tempContext.fill();
}
if (p[0] === 'pencil') {
tempContext.beginPath();
tempContext.arc(point[0], point[1], 10, Math.PI * 2, 0, !1);
tempContext.arc(point[2], point[3], 10, Math.PI * 2, 0, !1);
tempContext.fill();
}
if (p[0] === 'arrow') {
tempContext.beginPath();
tempContext.arc(point[0], point[1], 10, Math.PI * 2, 0, !1);
tempContext.arc(point[2], point[3], 10, Math.PI * 2, 0, !1);
tempContext.fill();
}
if (p[0] === 'text') {
tempContext.font = "15px Verdana";
tempContext.fillText(point[0], point[1], point[2]);
}
if (p[0] === 'rect') {
tempContext.beginPath();
tempContext.arc(point[0], point[1], 10, Math.PI * 2, 0, !1);
tempContext.fill();
tempContext.beginPath();
tempContext.arc(point[0] + point[2], point[1], 10, Math.PI * 2, 0, !1);
tempContext.fill();
tempContext.beginPath();
tempContext.arc(point[0], point[1] + point[3], 10, Math.PI * 2, 0, !1);
tempContext.fill();
tempContext.beginPath();
tempContext.arc(point[0] + point[2], point[1] + point[3], 10, Math.PI * 2, 0, !1);
tempContext.fill();
}
if (p[0] === 'image') {
tempContext.beginPath();
tempContext.arc(point[1], point[2], 10, Math.PI * 2, 0, !1);
tempContext.fill();
tempContext.beginPath();
tempContext.arc(point[1] + point[3], point[2], 10, Math.PI * 2, 0, !1);
tempContext.fill();
tempContext.beginPath();
tempContext.arc(point[1], point[2] + point[4], 10, Math.PI * 2, 0, !1);
tempContext.fill();
tempContext.beginPath();
tempContext.arc(point[1] + point[3], point[2] + point[4], 10, Math.PI * 2, 0, !1);
tempContext.fill();
}
if (p[0] === 'pdf') {
tempContext.beginPath();
tempContext.arc(point[1], point[2], 10, Math.PI * 2, 0, !1);
tempContext.fill();
tempContext.beginPath();
tempContext.arc(point[1] + point[3], point[2], 10, Math.PI * 2, 0, !1);
tempContext.fill();
tempContext.beginPath();
tempContext.arc(point[1], point[2] + point[4], 10, Math.PI * 2, 0, !1);
tempContext.fill();
tempContext.beginPath();
tempContext.arc(point[1] + point[3], point[2] + point[4], 10, Math.PI * 2, 0, !1);
tempContext.fill();
}
},
isPointInPath: function(x, y, first, second) {
return x > first - 10 && x < first + 10 && y > second - 10 && y < second + 10;
},
getPoint: function(point, prev, otherPoint) {
if (point > prev) {
point = otherPoint + (point - prev);
} else {
point = otherPoint - (prev - point);
}
return point;
},
getXYWidthHeight: function(x, y, prevX, prevY, oldPoints) {
if (oldPoints.pointsToMove == 'stretch-first') {
if (x > prevX) {
oldPoints.x = oldPoints.x + (x - prevX);
oldPoints.width = oldPoints.width - (x - prevX);
} else {
oldPoints.x = oldPoints.x - (prevX - x);
oldPoints.width = oldPoints.width + (prevX - x);
}
if (y > prevY) {
oldPoints.y = oldPoints.y + (y - prevY);
oldPoints.height = oldPoints.height - (y - prevY);
} else {
oldPoints.y = oldPoints.y - (prevY - y);
oldPoints.height = oldPoints.height + (prevY - y);
}
}
if (oldPoints.pointsToMove == 'stretch-second') {
if (x > prevX) {
oldPoints.width = oldPoints.width + (x - prevX);
} else {
oldPoints.width = oldPoints.width - (prevX - x);
}
if (y < prevY) {
oldPoints.y = oldPoints.y + (y - prevY);
oldPoints.height = oldPoints.height - (y - prevY);
} else {
oldPoints.y = oldPoints.y - (prevY - y);
oldPoints.height = oldPoints.height + (prevY - y);
}
}
if (oldPoints.pointsToMove == 'stretch-third') {
if (x > prevX) {
oldPoints.x = oldPoints.x + (x - prevX);
oldPoints.width = oldPoints.width - (x - prevX);
} else {
oldPoints.x = oldPoints.x - (prevX - x);
oldPoints.width = oldPoints.width + (prevX - x);
}
if (y < prevY) {
oldPoints.height = oldPoints.height + (y - prevY);
} else {
oldPoints.height = oldPoints.height - (prevY - y);
}
}
return oldPoints;
},
dragShape: function(x, y) {
if (!this.global.ismousedown) return;
tempContext.clearRect(0, 0, innerWidth, innerHeight);
if (is.isDragLastPath) {
this.dragLastPath(x, y);
}
if (is.isDragAllPaths) {
this.dragAllPaths(x, y);
}
var g = this.global;
g.prevX = x;
g.prevY = y;
},
end: function() {
if (!points.length) return;
tempContext.clearRect(0, 0, innerWidth, innerHeight);
var point = points[points.length - 1];
drawHelper[point[0]](context, point[1], point[2]);
},
dragAllPaths: function(x, y) {
var g = this.global,
prevX = g.prevX,
prevY = g.prevY,
p, point,
length = points.length,
getPoint = this.getPoint,
i = g.startingIndex;
for (i; i < length; i++) {
p = points[i];
point = p[1];
if (p[0] === 'line') {
points[i] = [p[0],
[
getPoint(x, prevX, point[0]),
getPoint(y, prevY, point[1]),
getPoint(x, prevX, point[2]),
getPoint(y, prevY, point[3])
], p[2]
];
}
if (p[0] === 'pencil') {
points[i] = [p[0],
[
getPoint(x, prevX, point[0]),
getPoint(y, prevY, point[1]),
getPoint(x, prevX, point[2]),
getPoint(y, prevY, point[3])
], p[2]
];
}
if (p[0] === 'arrow') {
points[i] = [p[0],
[
getPoint(x, prevX, point[0]),
getPoint(y, prevY, point[1]),
getPoint(x, prevX, point[2]),
getPoint(y, prevY, point[3])
], p[2]
];
}
if (p[0] === 'text') {
points[i] = [p[0],
[
point[0],
getPoint(x, prevX, point[1]),
getPoint(y, prevY, point[2])
], p[2]
];
}
if (p[0] === 'arc') {
points[i] = [p[0],
[
getPoint(x, prevX, point[0]),
getPoint(y, prevY, point[1]),
point[2],
point[3],
point[4]
], p[2]
];
}
if (p[0] === 'rect') {
points[i] = [p[0],
[
getPoint(x, prevX, point[0]),
getPoint(y, prevY, point[1]),
point[2],
point[3]
], p[2]
];
}
if (p[0] === 'image') {
points[i] = [p[0],
[
point[0],
getPoint(x, prevX, point[1]),
getPoint(y, prevY, point[2]),
point[3],
point[4],
point[5]
], p[2]
];
}
if (p[0] === 'pdf') {
points[i] = [p[0],
[
point[0],
getPoint(x, prevX, point[1]),
getPoint(y, prevY, point[2]),
point[3],
point[4],
point[5]
], p[2]
];
}
if (p[0] === 'quadratic') {
points[i] = [p[0],
[
getPoint(x, prevX, point[0]),
getPoint(y, prevY, point[1]),
getPoint(x, prevX, point[2]),
getPoint(y, prevY, point[3]),
getPoint(x, prevX, point[4]),
getPoint(y, prevY, point[5])
], p[2]
];
}
if (p[0] === 'bezier') {
points[i] = [p[0],
[
getPoint(x, prevX, point[0]),
getPoint(y, prevY, point[1]),
getPoint(x, prevX, point[2]),
getPoint(y, prevY, point[3]),
getPoint(x, prevX, point[4]),
getPoint(y, prevY, point[5]),
getPoint(x, prevX, point[6]),
getPoint(y, prevY, point[7])
], p[2]
];
}
}
},
dragLastPath: function(x, y) {
// if last past is undefined?
if (!points[points.length - 1]) return;
var g = this.global,
prevX = g.prevX,
prevY = g.prevY,
p = points[points.length - 1],
point = p[1],
getPoint = this.getPoint,
getXYWidthHeight = this.getXYWidthHeight,
isMoveAllPoints = g.pointsToMove === 'all';
if (p[0] === 'line') {
if (g.pointsToMove === 'head' || isMoveAllPoints) {
point[0] = getPoint(x, prevX, point[0]);
point[1] = getPoint(y, prevY, point[1]);
}
if (g.pointsToMove === 'tail' || isMoveAllPoints) {
point[2] = getPoint(x, prevX, point[2]);
point[3] = getPoint(y, prevY, point[3]);
}
points[points.length - 1] = [p[0], point, p[2]];
}
if (p[0] === 'pencil') {
if (g.pointsToMove === 'head' || isMoveAllPoints) {
point[0] = getPoint(x, prevX, point[0]);
point[1] = getPoint(y, prevY, point[1]);
}
if (g.pointsToMove === 'tail' || isMoveAllPoints) {
point[2] = getPoint(x, prevX, point[2]);
point[3] = getPoint(y, prevY, point[3]);
}
points[points.length - 1] = [p[0], point, p[2]];
}
if (p[0] === 'arrow') {
if (g.pointsToMove === 'head' || isMoveAllPoints) {
point[0] = getPoint(x, prevX, point[0]);
point[1] = getPoint(y, prevY, point[1]);
}
if (g.pointsToMove === 'tail' || isMoveAllPoints) {
point[2] = getPoint(x, prevX, point[2]);
point[3] = getPoint(y, prevY, point[3]);
}
points[points.length - 1] = [p[0], point, p[2]];
}
if (p[0] === 'text') {
if (g.pointsToMove === 'head' || isMoveAllPoints) {
point[1] = getPoint(x, prevX, point[1]);
point[2] = getPoint(y, prevY, point[2]);
}
points[points.length - 1] = [p[0], point, p[2]];
}
if (p[0] === 'arc') {
point[0] = getPoint(x, prevX, point[0]);
point[1] = getPoint(y, prevY, point[1]);
points[points.length - 1] = [p[0], point, p[2]];
}
if (p[0] === 'rect') {
if (isMoveAllPoints) {
point[0] = getPoint(x, prevX, point[0]);
point[1] = getPoint(y, prevY, point[1]);
}
if (g.pointsToMove === 'stretch-first') {
var newPoints = getXYWidthHeight(x, y, prevX, prevY, {
x: point[0],
y: point[1],
width: point[2],
height: point[3],
pointsToMove: g.pointsToMove
});
point[0] = newPoints.x;
point[1] = newPoints.y;
point[2] = newPoints.width;
point[3] = newPoints.height;
}
if (g.pointsToMove === 'stretch-second') {
var newPoints = getXYWidthHeight(x, y, prevX, prevY, {
x: point[0],
y: point[1],
width: point[2],
height: point[3],
pointsToMove: g.pointsToMove
});
point[1] = newPoints.y;
point[2] = newPoints.width;
point[3] = newPoints.height;
}
if (g.pointsToMove === 'stretch-third') {
var newPoints = getXYWidthHeight(x, y, prevX, prevY, {
x: point[0],
y: point[1],
width: point[2],
height: point[3],
pointsToMove: g.pointsToMove
});
point[0] = newPoints.x;
point[2] = newPoints.width;
point[3] = newPoints.height;
}
if (g.pointsToMove === 'stretch-last') {
point[2] = getPoint(x, prevX, point[2]);
point[3] = getPoint(y, prevY, point[3]);
}
points[points.length - 1] = [p[0], point, p[2]];
}
if (p[0] === 'image') {
if (isMoveAllPoints) {
point[1] = getPoint(x, prevX, point[1]);
point[2] = getPoint(y, prevY, point[2]);
}
if (g.pointsToMove === 'stretch-first') {
var newPoints = getXYWidthHeight(x, y, prevX, prevY, {
x: point[1],
y: point[2],
width: point[3],
height: point[4],
pointsToMove: g.pointsToMove
});
point[1] = newPoints.x;
point[2] = newPoints.y;
point[3] = newPoints.width;
point[4] = newPoints.height;
}
if (g.pointsToMove === 'stretch-second') {
var newPoints = getXYWidthHeight(x, y, prevX, prevY, {
x: point[1],
y: point[2],
width: point[3],
height: point[4],
pointsToMove: g.pointsToMove
});
point[2] = newPoints.y;
point[3] = newPoints.width;
point[4] = newPoints.height;
}
if (g.pointsToMove === 'stretch-third') {
var newPoints = getXYWidthHeight(x, y, prevX, prevY, {
x: point[1],
y: point[2],
width: point[3],
height: point[4],
pointsToMove: g.pointsToMove
});
point[1] = newPoints.x;
point[3] = newPoints.width;
point[4] = newPoints.height;
}
if (g.pointsToMove === 'stretch-last') {
point[3] = getPoint(x, prevX, point[3]);
point[4] = getPoint(y, prevY, point[4]);
}
points[points.length - 1] = [p[0], point, p[2]];
}
if (p[0] === 'pdf') {
if (isMoveAllPoints) {
point[1] = getPoint(x, prevX, point[1]);
point[2] = getPoint(y, prevY, point[2]);
}
if (g.pointsToMove === 'stretch-first') {
var newPoints = getXYWidthHeight(x, y, prevX, prevY, {
x: point[1],
y: point[2],
width: point[3],
height: point[4],
pointsToMove: g.pointsToMove
});
point[1] = newPoints.x;
point[2] = newPoints.y;
point[3] = newPoints.width;
point[4] = newPoints.height;
}
if (g.pointsToMove === 'stretch-second') {
var newPoints = getXYWidthHeight(x, y, prevX, prevY, {
x: point[1],
y: point[2],
width: point[3],
height: point[4],
pointsToMove: g.pointsToMove
});
point[2] = newPoints.y;
point[3] = newPoints.width;
point[4] = newPoints.height;
}
if (g.pointsToMove === 'stretch-third') {
var newPoints = getXYWidthHeight(x, y, prevX, prevY, {
x: point[1],
y: point[2],
width: point[3],
height: point[4],
pointsToMove: g.pointsToMove
});
point[1] = newPoints.x;
point[3] = newPoints.width;
point[4] = newPoints.height;
}
if (g.pointsToMove === 'stretch-last') {
point[3] = getPoint(x, prevX, point[3]);
point[4] = getPoint(y, prevY, point[4]);
}
points[points.length - 1] = [p[0], point, p[2]];
}
if (p[0] === 'quadratic') {
if (g.pointsToMove === 'starting-points' || isMoveAllPoints) {
point[0] = getPoint(x, prevX, point[0]);
point[1] = getPoint(y, prevY, point[1]);
}
if (g.pointsToMove === 'control-points' || isMoveAllPoints) {
point[2] = getPoint(x, prevX, point[2]);
point[3] = getPoint(y, prevY, point[3]);
}
if (g.pointsToMove === 'ending-points' || isMoveAllPoints) {
point[4] = getPoint(x, prevX, point[4]);
point[5] = getPoint(y, prevY, point[5]);
}
points[points.length - 1] = [p[0], point, p[2]];
}
if (p[0] === 'bezier') {
if (g.pointsToMove === 'starting-points' || isMoveAllPoints) {
point[0] = getPoint(x, prevX, point[0]);
point[1] = getPoint(y, prevY, point[1]);
}
if (g.pointsToMove === '1st-control-points' || isMoveAllPoints) {
point[2] = getPoint(x, prevX, point[2]);
point[3] = getPoint(y, prevY, point[3]);
}
if (g.pointsToMove === '2nd-control-points' || isMoveAllPoints) {
point[4] = getPoint(x, prevX, point[4]);
point[5] = getPoint(y, prevY, point[5]);
}
if (g.pointsToMove === 'ending-points' || isMoveAllPoints) {
point[6] = getPoint(x, prevX, point[6]);
point[7] = getPoint(y, prevY, point[7]);
}
points[points.length - 1] = [p[0], point, p[2]];
}
}
};