Javascript 我的代码显示了一个对角线,它不应该';T
我正在用javascript和html5编写一个小日历应用程序 出于某种原因,其中一个事件有一条对角线,而我认为它应该是水平的 感谢您的帮助Javascript 我的代码显示了一个对角线,它不应该';T,javascript,html,graphics,canvas,Javascript,Html,Graphics,Canvas,我正在用javascript和html5编写一个小日历应用程序 出于某种原因,其中一个事件有一条对角线,而我认为它应该是水平的 感谢您的帮助 <!doctype html> <html> <head> <title>Calendar</title> </head> <body> <canvas id="canvas" width="700" heig
<!doctype html>
<html>
<head>
<title>Calendar</title>
</head>
<body>
<canvas id="canvas" width="700" height="500"></canvas>
<script type="text/javascript">
function Event(start, end, name, text){
this.start = start;
this.end = end;
this.name = name;
this.text = text;
}
function EventCollection(){
this.events = [];
this.insert = function insert(event){
// find position for event
var pos = 0;
for(var i=0; i<this.events.length && this.events[i].start < this.events[i].start; i++)
pos = i;
// insert event
this.events.splice(pos, 0, event);
}
this.get = function get(i){
return this.events[i];
}
this.length = function length(){
return this.events.length;
}
}
var events = new EventCollection();
var currentTime = Date.now();
events.insert(new Event(currentTime + 60000, currentTime + 60000 * 5, "Meeting", ""));
events.insert(new Event(currentTime + 60000 * 2, currentTime + 60000 * 10));
function displayEvent(events, i, scale, now, BORDER){
var underlapping = 0;
for(var j=i; j>0 && events.get(j).end >= events.get(i); j++)
underlapping++;
var overlapping = 0;
for(var j=i; j<events.length() && events.get(j).start < events.get(i).end; j++){
overlapping++;
}
var LAPPING_DISTANCE = 5;
beginX = BORDER + (events.get(i).start < now.getTime() ? 0 : BORDER + scale * (events.get(i).start - now.getTime()));
beginY = canvas.height/2 - (underlapping +2)* LAPPING_DISTANCE;
context.moveTo(beginX, beginY);
endX = (BORDER + (events.get(i).end - events.get(i).start)*scale < canvas.width - BORDER ? BORDER + (events.get(i).end - events.get(i).start)*scale : canvas.width);
endY = beginY;
context.lineTo(endX, endY);
}
function displayEvents(events, scale, now, BORDER){
for(var i=0; i<events.length(); i++){
displayEvent(events, i, scale, now, BORDER);
}
}
var visibleBegin = 0;
var visibleEnd = 0;
var canvas = document.getElementById("canvas");
var context = canvas.getContext("2d");
function draw(context, canvas, events, scale){
var now = new Date();
var BORDER = 10;
context.clearRect(0, 0, canvas.width, canvas.height);
context.beginPath();
context.moveTo(0, canvas.height/2);
context.lineTo(canvas.width, canvas.height/2);
// draw tickmark for now
var HALFTICKLENGTH = 10;
context.moveTo(10, canvas.height/2-HALFTICKLENGTH);
context.lineTo(10, canvas.height/2+HALFTICKLENGTH);
var hours = now.getHours();
var minutes = now.getMinutes();
context.fillText(hours + ":" + (minutes<10 ? "0" : "") + minutes, 10, canvas.height/2+20);
// draw events
displayEvents(events, 1, now);
// draw end date
context.moveTo(canvas.width - BORDER, canvas.height/2-HALFTICKLENGTH);
context.lineTo(canvas.width - BORDER, canvas.height/2+HALFTICKLENGTH);
context.strokeStyle = "#000";
context.stroke();
context.closePath();
}
draw(context, canvas, events, 1);
</script>
</body>
</html>
历法
函数事件(开始、结束、名称、文本){
this.start=start;
this.end=end;
this.name=名称;
this.text=文本;
}
函数EventCollection(){
this.events=[];
this.insert=函数插入(事件){
//查找事件的位置
var-pos=0;
对于(var i=0;i0&&events.get(j).end>=events.get(i);j++)
底层应用++;
var重叠=0;
对于(var j=i;j设置
var LAPPING_DISTANCE = -5;
还是修这条线
beginY = canvas.height/2 - (underlapping + 2) * (-LAPPING_DISTANCE);
似乎是水平设置
var LAPPING_DISTANCE = -5;
还是修这条线
beginY = canvas.height/2 - (underlapping + 2) * (-LAPPING_DISTANCE);
似乎是水平的您有一个不匹配的context.beginPath()
/context.stroke()
对。快速看一眼,我会说这是在您从draw
函数调用displayEvents
时发生的。您有一个不匹配的context.beginPath()
/context.stroke()
pair。快速看一眼,我会说这是在从draw
函数调用displayEvents
时发生的。那么我应该有一个context.beginPath();…;context.closePath();context.stroke();对于我画的每件东西,我应该有一个context.beginPath();…;context.closePath();context.stroke();对于我画的每一件东西?我不知道为什么,但这解决了它。谢谢!不客气。它改变了上下文。移动到Y偏移。使用负重叠距离,偏移似乎是错误的。我不知道为什么,但这解决了它。谢谢!不客气。它改变了上下文。移动到Y偏移。使用负重叠距离,偏移似乎是错误的。