绘制几种常见图形的类方法。
绘制图形.png
1.绘制圆形
/*
*画圆
*context 当前上下文
*fillColor 填充色
*radius 半径
*point 圆心点坐标
*/
+ (void)drawCircle:(CGContextRef)context
fillcolor:(UIColor *)fillColor
radius:(CGFloat)radius
point:(CGPoint)point {
CGContextSaveGState(context);
CGContextSetShouldAntialias(context, YES);
CGContextSetFillColorWithColor(context, fillColor.CGColor);
CGContextAddArc(context, point.x, point.y, radius, 0, M_PI * 2, 0);
CGContextDrawPath(context, kCGPathFill);
CGContextRestoreGState(context);
}
2.绘制同心圆
/*
*画同心圆
*context 当前上下文
*lineColor 外圆颜色
*fillColor 内圆颜色
*lineWidth 外圆半径－内圆半径
*radius 内圆半径
*point 圆心点坐标
*/
+ (void)drawConcentricCircle:(nullable CGContextRef)context
lineColor:(nullable UIColor *)lineColor
fillColor:(nullable UIColor *)fillColor
lineWidth:(CGFloat)lineWidth
radius:(CGFloat)radius
point:(CGPoint)point {
CGContextSetShouldAntialias(context, YES);
CGContextSetLineWidth(context, lineWidth);
CGContextSetStrokeColorWithColor(context, lineColor.CGColor); //线的填充色
CGContextSetFillColorWithColor(context, fillColor.CGColor); //圆的填充色
//内圆
CGContextAddArc(context, point.x, point.y, radius, 0, M_PI * 2, 0);
CGContextDrawPath(context, kCGPathFill);
//外圆
CGContextAddArc(context, point.x, point.y, radius, 0, M_PI * 2, 0);
CGContextDrawPath(context, kCGPathStroke);
}
3.绘制矩形
/*
＊画矩形
*context 当前上下文
*color 填充色
*rect 矩形位置的大小
*/
+ (void)drawRect:(nullable CGContextRef)context
color:(nullable UIColor*)color
rect:(CGRect)rect {
CGContextSetShouldAntialias(context, YES);
CGContextSetFillColorWithColor(context, color.CGColor);
CGContextAddRect(context, rect);
CGContextDrawPath(context, kCGPathFill);
}
4.绘制圆角矩形
/*
*context 当前上下文
*lineColor 边框颜色
*fillColor 填充颜色
*lineWidth 边框宽度
*cornerRadius 圆角半径
*rect 矩形位置和大小
*/
+ (void)drawRoundedRect:(nullable CGContextRef)context
lineColor:(nullable UIColor *)lineColor
fillColor:(nullable UIColor *)fillColor
lineWidth:(CGFloat)lineWidth
cornerRadius:(CGFloat)cornerRadius
rect:(CGRect)rect {
CGFloat x = rect.origin.x;
CGFloat y = rect.origin.y;
CGFloat width = rect.size.width;
CGFloat height = rect.size.height;
CGContextSetShouldAntialias(context, YES);
CGContextSetLineWidth(context, lineWidth);
CGContextSetStrokeColorWithColor(context, lineColor.CGColor);
CGContextSetFillColorWithColor(context, fillColor.CGColor);
CGContextMoveToPoint(context, x + width, y + height - cornerRadius); //从右下角开始画起
CGContextAddArcToPoint(context, x + width, y + height, x + width - cornerRadius, y + height, cornerRadius); //右下角的圆角
CGContextAddArcToPoint(context, x, y + height, x, y + height - cornerRadius, cornerRadius); //左下角的圆角
CGContextAddArcToPoint(context, x, y, x + cornerRadius, y, cornerRadius); //左上角的圆角
CGContextAddArcToPoint(context, x + width, y, x + width, y + height - cornerRadius, cornerRadius); //右上角的圆角
CGContextClosePath(context);
CGContextDrawPath(context, kCGPathFillStroke);
}
5.绘制三角形
typedef NS_ENUM(NSInteger, TriangleDirection) {
TriangleDirectionUp = 0, //向上
TriangleDirectionDown, //向下
TriangleDirectionLeft, //向左
TriangleDirectionRight //向右
};
#pragma mark - 绘制三角形
/*
*画正三角形
*context 当前上下文
*lineColor 边框颜色
*fillColor 填充颜色
*centerPoint 正三角形中心
*length 边长
*lineWidth 边框宽度
*TriangleDirection 三角形方向
*/
+ (void)drawTriangle:(nullable CGContextRef)context
lineColor:(nullable UIColor *)lineColor
fillColor:(nullable UIColor *)fillColor
centerPoint:(CGPoint)centerPoint
length:(CGFloat)length
lineWidth:(CGFloat)lineWidth
direction:(TriangleDirection)direction {
CGContextSetShouldAntialias(context, YES);
CGContextSetLineWidth(context, lineWidth);
CGContextSetStrokeColorWithColor(context, lineColor.CGColor);
CGContextSetFillColorWithColor(context, fillColor.CGColor);
//正三角形的外接圆半径
CGFloat radius = length * sqrt(3) / 3.0;
//正三角形的圆心距离底边的距离
CGFloat distance = length * sqrt(3) / 6.0;
CGFloat halfLength = length / 2.0;
CGPoint points[3];
switch (direction) {
case TriangleDirectionUp:
points[0] = CGPointMake(centerPoint.x, centerPoint.y - radius);
points[1] = CGPointMake(centerPoint.x - halfLength, centerPoint.y + distance);
points[2] = CGPointMake(centerPoint.x + halfLength, centerPoint.y + distance);
break;
case TriangleDirectionDown:
points[0] = CGPointMake(centerPoint.x, centerPoint.y + radius);
points[1] = CGPointMake(centerPoint.x - halfLength, centerPoint.y - distance);
points[2] = CGPointMake(centerPoint.x + halfLength, centerPoint.y - distance);
break;
case TriangleDirectionLeft:
points[0] = CGPointMake(centerPoint.x - radius, centerPoint.y);
points[1] = CGPointMake(centerPoint.x + distance, centerPoint.y - halfLength);
points[2] = CGPointMake(centerPoint.x + distance, centerPoint.y + halfLength);
break;
case TriangleDirectionRight:
points[0] = CGPointMake(centerPoint.x + radius, centerPoint.y);
points[1] = CGPointMake(centerPoint.x - distance, centerPoint.y - halfLength);
points[2] = CGPointMake(centerPoint.x - distance, centerPoint.y + halfLength);
break;
default:
break;
}
CGContextAddLines(context, points, 3);
CGContextClosePath(context);
CGContextDrawPath(context, kCGPathFillStroke);
CGContextDrawPath(context, kCGPathStroke);
}
/*
*任意三角形
*context 当前上下文
*lineColor 边框颜色
*fillColor 填充颜色
*pointArr 三个点的坐标
*lineWidth 边框宽度
*/
+ (void)drawTriangle:(nullable CGContextRef)context
lineColor:(nullable UIColor *)lineColor
fillColor:(nullable UIColor *)fillColor
pointArr:(nullable NSArray *)pointArr
lineWidth:(CGFloat)lineWidth {
CGContextSaveGState(context);
CGContextSetShouldAntialias(context, YES);
CGContextSetLineWidth(context, lineWidth);
CGContextSetStrokeColorWithColor(context, lineColor.CGColor);
CGContextSetFillColorWithColor(context, fillColor.CGColor);
if (pointArr.count != 3) {
return;
}
CGPoint points[3];
points[0] = [pointArr[0] CGPointValue];
points[1] = [pointArr[1] CGPointValue];
points[2] = [pointArr[2] CGPointValue];
CGContextAddLines(context, points, 3);
CGContextClosePath(context);
CGContextDrawPath(context, kCGPathFillStroke);
CGContextRestoreGState(context);
}```