Port new GlyphContext, FontData, enums, props, Bezier and text rendering

2026-05-30 05:31:01 +00:00 · 2017-08-23 05:41:35 +03:00
parent 3cafc34cb2
commit ccb8729917
105 changed files with 10437 additions and 105 deletions
@@ -0,0 +1,56 @@
+/*
+ Erica Sadun, http://ericasadun.com
+ iPhone Developer's Cookbook, 6.x Edition
+ BSD License, Use at your own risk
+ */
+
+#import "UIBezierPath+Text.h"
+#import "Utility.h"
+
+@implementation UIBezierPath (TextUtilities)
+- (void) drawAttributedString: (NSAttributedString *) string
+{
+    if (!string) return;
+    CGContextRef context = UIGraphicsGetCurrentContext();
+    if (context == NULL) COMPLAIN_AND_BAIL(@"No context to draw into", nil);
+    
+    if (self.elements.count < 2) return;
+    
+    // Keep a running tab of how far the glyphs have traveled to
+    // be able to calculate the percent along the point path
+    float glyphDistance = 0.0f;
+    float lineLength = self.pathLength;
+    
+    for (int loc = 0; loc < string.length; loc++)
+    {
+        // Retrieve item
+        NSRange range = NSMakeRange(loc, 1);
+        NSAttributedString *item = [string attributedSubstringFromRange:range];
+        
+        // Start halfway through each glyph
+        CGRect bounding = [item boundingRectWithSize:CGSizeMake(CGFLOAT_MAX, CGFLOAT_MAX) options:0 context:nil];
+        glyphDistance += bounding.size.width / 2;
+
+        // Find point
+        CGPoint slope;
+        CGFloat percentConsumed = glyphDistance / lineLength;
+        CGPoint targetPoint = [self pointAtPercent:percentConsumed withSlope:&slope];
+        
+        // Accommodate the forward progress
+        glyphDistance += bounding.size.width / 2;         
+        if (percentConsumed >= 1.0f) break;
+
+        // Calculate the rotation
+        float angle = atan(slope.y / slope.x); //  + M_PI;
+        if (slope.x < 0) angle += M_PI; // going left, update the angle
+
+        // Draw the glyph
+        PushDraw(^{
+            CGContextTranslateCTM(context, targetPoint.x, targetPoint.y);
+            CGContextRotateCTM(context, angle);
+            CGContextTranslateCTM(context, -bounding.size.width / 2, -item.size.height / 2);
+            [item drawAtPoint:CGPointZero];
+        });
+    }
+}
+@end