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drawing.js
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drawing.js
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"use strict";
function redrawAnims()
{
animContext.clearRect(0, 0, canvas.width, canvas.height);
// if we're trying to add an edge, draw it to the mouse
if (clickedVertex != -1 && selectedVertex == -1)
{
animContext.beginPath();
animContext.strokeStyle = "#000000";
animContext.lineWidth = 4;
animContext.moveTo(G.pos[clickedVertex].x, G.pos[clickedVertex].y);
animContext.lineTo(mx, my);
animContext.stroke();
}
// if we're moving a vertex, draw all its edges
if (clickedVertex != -1 && clickedVertex == selectedVertex)
{
for (var i = 0; i < G.list[selectedVertex].length; ++i)
{
const v = G.list[selectedVertex][i];
if (!isDrawingSubgraph || (isVertexDrawn[selectedVertex] && isVertexDrawn[v]))
{
animContext.beginPath();
animContext.strokeStyle = "#000000";
animContext.lineWidth = 4;
animContext.moveTo(G.pos[selectedVertex].x, G.pos[selectedVertex].y);
animContext.lineTo(G.pos[v].x, G.pos[v].y);
animContext.stroke();
}
}
drawVertex(animContext, selectedVertex, "#555555");
}
}
function redraw()
{
backContext.fillStyle = "#DDDDDD";
backContext.fillRect(0, 0, canvas.width, canvas.height);
// draw edges
for (var u = 0; u < G.list.length; ++u)
{
const neighbors = G.list[u];
for (var i = 0; i < neighbors.length; ++i)
{
const v = neighbors[i];
if (!isDrawingSubgraph || (isVertexDrawn[u] && isVertexDrawn[v]))
{
// u < v so we don't draw each edge twice
// and also for easily checking against selected edge
// also don't draw the clicked down one - it is drawn in redrawAnims()
// but only if we're moving it!!!
if (u < v && (u != clickedVertex && v != clickedVertex) || selectedVertex == -1)
{
if (selectedEdge[0] == u && selectedEdge[1] == v)
{
backContext.beginPath();
backContext.strokeStyle = "#AA0000";
backContext.lineWidth = 9;
backContext.moveTo(G.pos[u].x, G.pos[u].y);
backContext.lineTo(G.pos[v].x, G.pos[v].y);
backContext.stroke();
}
backContext.beginPath();
backContext.strokeStyle = "#000000";
backContext.lineWidth = 3;
backContext.moveTo(G.pos[u].x, G.pos[u].y);
backContext.lineTo(G.pos[v].x, G.pos[v].y);
backContext.stroke();
}
}
}
}
// draw overlapping edge highlights as arcs going
// away from the main edge so that you can see them all
var edgeHighlightCount = new Array(G.list.length);
for (var i = 0; i < G.list.length; ++i)
{
// triangular array since always indexed [i][j] with i > j (or i >= j if we allow loops later)
edgeHighlightCount[i] = new Array(i + 1);
edgeHighlightCount[i].fill(0);
}
// draw coloured edge highlights on top
for (var col in edgeHighlights)
{
for (var i = 0; i < edgeHighlights[col].length; ++i)
{
// this is important to get rid of potentially issues when it would
// otherwise draw both u,v and v,u in overlapping spots when one would
// have one higher bezierIndex than the toher
const u = Math.min(edgeHighlights[col][i][0], edgeHighlights[col][i][1]);
const v = Math.max(edgeHighlights[col][i][0], edgeHighlights[col][i][1]);
if (!isDrawingSubgraph || (isVertexDrawn[u] && isVertexDrawn[v]))
{
var bezierOffset = edgeHighlightCount[v][u];
++(edgeHighlightCount[v][u]);
backContext.beginPath();
backContext.strokeStyle = col;
backContext.lineWidth = 4;
backContext.moveTo(G.pos[u].x, G.pos[u].y);
if (bezierOffset == 0)
{
backContext.lineTo(G.pos[v].x, G.pos[v].y);
}
else
{
// flip norm across the line on odd lines so that they alternate
const normAngle = (bezierOffset % 2 == 0) ? (Math.PI / 2) : (-Math.PI / 2);
bezierOffset = Math.floor((bezierOffset + 1) / 2);
const midx = (G.pos[u].x + G.pos[v].x) / 2;
const midy = (G.pos[u].y + G.pos[v].y) / 2;
const xdif = G.pos[v].x - G.pos[u].x;
const ydif = G.pos[v].y - G.pos[u].y;
const dist = Math.sqrt(xdif * xdif + ydif * ydif);
const norm = Math.atan2(ydif, xdif) + normAngle;
const normScalar = 3 + bezierOffset * 1.3 + bezierOffset * 0.1 * Math.pow(dist, 0.9);
const controlx = midx + normScalar * Math.cos(norm);
const controly = midy + normScalar * Math.sin(norm);
backContext.quadraticCurveTo(controlx, controly, G.pos[v].x, G.pos[v].y);
}
backContext.stroke();
}
}
}
// draw vertices on top
function darkenColour(colour, lum)
{
// assumes 0 <= lum <= 1
var colourNum = parseInt(colour.slice(1),16);
var r = Math.round(((colourNum >> 16) & 0xFF) * lum)
var g = Math.round(((colourNum >> 8) & 0xFF) * lum)
var b = Math.round((colourNum & 0xFF) * lum)
return "#" + (0x1000000 + r * 0x10000 + g * 0x100 + b).toString(16).slice(1);
}
for (var id = 0; id < G.pos.length; ++id)
{
// selected vertex is drawn in redrawAnims
if (id != clickedVertex || clickedVertex != selectedVertex)
{
drawVertex(backContext, id, (id == selectedVertex ? "#555555" : "#BBBBBB"));
}
}
for (var col in vertexHighlights)
{
for (var i = 0; i < vertexHighlights[col].length; ++i)
{
drawVertex(backContext, vertexHighlights[col][i], darkenColour(col, (vertexHighlights[col][i] == selectedVertex ? 0.4 : 0.8)));
}
}
}
function drawVertex(context, u, colour)
{
if (!isDrawingSubgraph || isVertexDrawn[u])
{
context.beginPath();
context.arc(G.pos[u].x, G.pos[u].y, vertexSize, 0, 2*Math.PI);
context.fillStyle = colour;
context.fill();
context.lineWidth = 3;
context.strokeStyle = "#000000";
context.stroke();
context.font = "12px Arial";
context.lineWidth = 1;
context.textAlign = "center";
context.textBaseline = "middle";
context.fillStyle = "#000000";
context.fillText(u, G.pos[u].x, G.pos[u].y);
}
}
function resetHighlights()
{
edgeHighlights = {};
vertexHighlights = {};
isVertexDrawn = new Array(G.list.length);
isVertexDrawn.fill(true);
}