绘制粉笔风格的path
很简单的，三步走，关键是用NSImage imageNamed:方法生成一个粉笔样的color。
- S1: 准备一张粉笔纹理的图片，比如像这样的:
- S2: 用这个图片生成一个颜色：
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NSImage *image = [NSImage imageNamed:@"chalk"];
NSColor *color = [NSColor colorWithPatternImage:image];
- S3: 用这个color去绘制path、string或者作为背景色等
demo代码如下：
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#import "ChalkView.h"
@implementation ChalkView
- (void)drawRect:(NSRect)dirtyRect {
[super drawRect:dirtyRect];
// Drawing code here.
NSImage *image = [NSImage imageNamed:@"chalk"];
NSColor *color = [NSColor colorWithPatternImage:image];
[color set];
[NSBezierPath setDefaultLineWidth:10];
[NSBezierPath strokeLineFromPoint:NSZeroPoint toPoint:NSMakePoint(100, 100)];
NSFont *font = [NSFont systemFontOfSize:50];
NSDictionary *attr = @{NSForegroundColorAttributeName: color, NSFontAttributeName:font};
[@"Hello Leonidas" drawInRect:dirtyRect withAttributes:attr];
}
@end
效果如下:
选择的粉笔风格纹理图片决定了最终粉笔风格的显示效果，所以找一张好一点的图片吧，或者用OpenGL制作一个
