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 How can I draw double headed arrow |
| Posted by Tony on Nov-17-2017 19:43 |
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Hi,
How can I draw double headed arrow on XYchart.
please refer to the attachment.
Thanks.
My sample code:
double Measx[2] = {x1 , x2};
double Measy[2] = {y1 , y2};
LineLayer *layer = c->addLineLayer(DoubleArray(Measy, 2), 0);
layer->setXData(DoubleArray(Measx, 2));
layer->setLineWidth(2);
version: 6.0
programming language : MFC C++
operating system:Win7
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| Re: How can I draw double headed arrow |
| Posted by Peter Kwan on Nov-18-2017 00:37 |
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Hi Tony,
You can use vector layers (XYChart.addVectorLayer) to add arrows to the chart. You can use two such layers for arrows pointing in opposite directions. For example:
// The starting and ending points of the arrows
double startX[] = {x1};
double endX[] = {x2};
double startY[] = {y1};
double endY[] = {y2};
VectorLayer *layer1 = c->addVectorLayer(DoubleArray(startX, 1), DoubleArray(startY, 1), DoubleArray(endX, 1), DoubleArray(endY, 1), Chart::EndPoints, 0x000000);
layer1->setLineWidth(1);
VectorLayer layer2 = c->addVectorLayer(DoubleArray(endX, 1), DoubleArray(endY, 1), DoubleArray(startX, 1), DoubleArray(startY, 1), Chart::EndPoints, 0x000000);
// Set arrow head size . If not set, will use default size.
layer1->setArrowHead(15);
layer2->setArrowHead(15);
Hope this can help.
Regards
Peter Kwan |
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