iOS 畫直線，虛線，圓，矩形

iOS 畫直線，虛線，圓，矩形

畫矩形

    CGContextRef ctx = UIGraphicsGetCurrentContext();

    CGContextSetStrokeColorWithColor(ctx, [_axisColor CGColor]);

    CGContextSetLineWidth(ctx, 1.0);

    CGPoint poins[] = {CGPointMake(_margin, _margin),CGPointMake(_margin+_axisWidth, _margin),CGPointMake(_margin+_axisWidth, _margin+_axisHeight),CGPointMake(_margin, _margin+_axisHeight)};

    CGContextAddLines(ctx,poins,4);

    CGContextClosePath(ctx);

    CGContextStrokePath(ctx);

畫虛線

        CGPoint aPoints[2];//坐標點

        aPoints[0] =CGPointMake(_margin, _margin+i*(_axisHeight/_gridStep));//坐標1

        aPoints[1] =CGPointMake(_margin+_axisWidth, _margin+i*(_axisHeight/_gridStep));//坐標2

        CGContextSetStrokeColorWithColor(ctx, _axisColor.CGColor);

        CGFloat lengths[2] = {5,5};

        CGContextSetLineDash(ctx, 0, lengths, 1);  //畫虛線

        CGContextMoveToPoint(ctx, aPoints[0].x,aPoints[0].y);    //開始畫線

        CGContextAddLineToPoint(ctx, aPoints[1].x,aPoints[1].y);

        CGContextStrokePath(ctx);

畫圓

    UIColor * color = [_colorArray objectAtIndex:_index];

    CGFloat rColor,gColor,bColor,alph;

    [color getRed:&rColor green:&gColor blue:&bColor alpha:&alph];

    /*畫圓*/

    CGContextSetRGBStrokeColor(context,rColor,gColor,bColor,1);//畫筆線的顏色

    CGContextSetFillColorWithColor(context, [UIColor whiteColor].CGColor);

    CGFloat lengths[2] = {5,5};

    CGContextSetLineDash(context, 0, lengths, 0);//防止被虛線

    CGContextSetLineWidth(context, 2.0);//線的寬度

    CGFloat radius = 3;//半徑

    CGContextAddArc(context, point.x, point.y,radius, 0, 2*M_PI, 0); //添加一個圓

    CGContextDrawPath(context, kCGPathFillStroke); //繪制路徑//kCGPathStroke//kCGPathFill