CGFloat widthValue = -1.0;
CFNumberRef strokeWidth = CFNumberCreate(NULL,kCFNumberFloatType,&widthValue);
//Setup the attributes dictionary with font and color
NSDictionary *attributes = [NSDictionary dictionaryWithObjectsAndKeys:
(id)font, (id)kCTFontAttributeName,
我有多维数据需要在Google图表中可视化。我使用多维的意思是,它可能包含多维的普通列(字符串、日期...)和多个数字列。
例如,考虑下面的简单数据;由三个字符串维度和一个数值组成:
Profession (String) | Country (String) | Gender (String) | income (Numerical)
Doctor Germany male 30000
Engineer Austria female
strokeRect (0, 0, canvasWidth, canvasHeight);绘制了一个完整的矩形,但线条宽度被减半,下面是一个示例:
<canvas></canvas>
<script>
var canvas = document.getElementsByTagName ("canvas");
var lineWidth = 10;
var canvasHeight = canvas[0].height;
var canvasWidth = canvas[0].width;
va