blocks|key|3269096|text|我正在做一件非常类似的事情，目前画的是参数EQ的波德扫描(一条带有多个扫描曲线的长线)。我的方式(伪风格)：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3269097|qreal+yCoords[GRAPH_WIDTH];
...
QPainter+Painter(this);
Painter.setRenderHint(QPainter::Antialiasing,+true);
//Painter.setRenderHint(QPainter::HighQualityAntialiasing,+true);+//opengl+specific
for(int+xCoord+=+0;+xCoord+<+GRAPH_WIDTH;+x%2B%2B)
++Path.lineTo(QPointF(xCoord,+yCoord[xCoord]));
...
Painter.drawPath(Path);|code-block|syntax|javascript|3269098|对setRenderHint的调用和用QPointF+(即两个qreal)而不是QPoint+(两个int)绘制线条的组合使得这条线非常平滑。|offset|length|style|CODE|3269099|我们在运行Ubuntu的SBC上使用这种方法，并为600x300px图重新绘制时间(首先包括所有复杂的数学以获得分数)~80+in。初步测试表明，启用opengl绘制将这个值减少到了8ms(显然，处理器密集型任务是具有抗混叠的画图)，所以如果您能够做到这一点，我认为这个解决方案将适用于您。|3269100|entityMap|0|LINK|mutability|MUTABLE|url|http://doc.qt.nokia.com/latest/qapplication.html#QApplication^0|0|0|1|D|J|7|V|5|14|6|1E|3|0|21|A|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Y|8|@$I|Z|J|10|K|L]|$I|11|J|12|K|L]|$I|13|J|14|K|L]|$I|15|J|16|K|L]|$I|17|J|18|K|L]]|9|@]|A|$]]|$1|M|3|N|5|6|7|19|8|@]|9|@$I|1A|J|1B|1|1C]]|A|$]]|$1|O|3|-4|5|6|7|1D|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|V]]]]

I am doing a very similar thing currently with painting the bode sweep of a parametric EQ (a long line with multiple sweeping curves). The way I'm doing it (pseudo style):

<pre><code>qreal yCoords[GRAPH_WIDTH];
...
QPainter Painter(this);
Painter.setRenderHint(QPainter::Antialiasing, true);
//Painter.setRenderHint(QPainter::HighQualityAntialiasing, true); //opengl specific
for(int xCoord = 0; xCoord &lt; GRAPH_WIDTH; x++)
 Path.lineTo(QPointF(xCoord, yCoord[xCoord]));
...
Painter.drawPath(Path);
</code></pre>

The combination of the calls to <code>setRenderHint</code> and drawing lines with <code>QPointF</code> (i.e. two <code>qreal</code>) rather than <code>QPoint</code> (two <code>int</code>) makes the line very smooth.

We're using this on an SBC running Ubuntu and getting redraw timings (including all of the complex math to get the points in the first place) of ~80ms for a 600x300px graph. Initial tests show that <a href="http://doc.qt.nokia.com/latest/qapplication.html#QApplication">enabling opengl rendering</a> reduces this to ~8ms (clearly the processor intensive task is the painting with antialiasing), so if you can do that, I think this solution will work for you.

blocks|key|3269134|text|QCustomPlot是一个免费的、易于使用的类，可以在网上找到。这也许对你想做的事情更好。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3269135|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

QCustomPlot is a free and easy to use class that can be found online. It may be better for what you are looking to do.

I'm experimenting with ways to draw a sinusoidal graph. 

My widget is only expecting to get passed in a few arbitrary data points. I have to fit these data points to a sinusoidal line curve:

<img src="https://intmstat.com/trigonometric-graphs/sinx.gif" alt="Sin(x)">

So far, I've tried a few methods using <a href="http://doc.qt.nokia.com/latest/qpainterpath.html" rel="nofollow noreferrer">QPainterPath</a>.

<ol>
<li>QPainterPath::lineTo - I tried using this function to plot the curve by taking my data points and creating so many points BETWEEN them, that the line actually smooths out a bit. This is a little too computationally intensive though, I feel.</li>
<li>QPainterPath::cubicTo - From what I gathered from RTFM, this is the best way to go. The only problem is that I'm not sure how to plot my control points at spots where it will consistently and programmatically smooth out the curve the way I want it to. I was unable to get the desired result with this function.</li>
</ol>

After some googling, I came across a few forum posts that were using Qwt for curve plotting. It would be great if I could use Qwt, but it's not an option since I'm restricted to only using Qt.

Does anyone have helpful feedback/suggestions?

Using Qt To Draw the Graph of Sin(x)

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我在试验画正弦波图的方法。我的小部件只期望在几个任意数据点中传递。我必须把这些数据点拟合成正弦曲线：​​到目前为止，我已经尝试了几种使用的方法。QPainterPath::lineTo -我尝试使用这个函数来绘制曲线，方法是取我的数据点，并在它们之间创建这么多的点，这样这条线实际上会平滑一点。不过，我觉得这有点太费算了...

问用Qt绘制Sin(x)图
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