From 6a16ad9c408fb84dd27c618312f3111563ca2ad5 Mon Sep 17 00:00:00 2001
From: Jules Laplace <jules@okfoc.us>
Date: Tue, 9 Dec 2014 01:40:49 -0500
Subject: blitting functions

---
 js/blit.js | 41 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)
 create mode 100644 js/blit.js

(limited to 'js/blit.js')

diff --git a/js/blit.js b/js/blit.js
new file mode 100644
index 0000000..09f39b2
--- /dev/null
+++ b/js/blit.js
@@ -0,0 +1,41 @@
+var blit = (function(){
+	var blit = {}
+	blit.and = blit.atop = function(A, B, x, y){
+		x = x || 0 ; y = y || 0
+		B.forEach(function(lex, u, v){
+			var cell = A.getCell(u+x, v+y)
+			if (cell && lex.opacity > 0) {
+				cell.clone(lex)
+			}
+		})
+	}
+	blit.or = blit.under = function(A, B, x, y){
+		x = x || 0 ; y = y || 0
+		B.forEach(function(lex, u, v){
+			var cell = A.getCell(u+x, v+y)
+			if (cell && cell.opacity == 0) {
+				cell.clone(lex)
+			}
+		})
+	}
+	blit.set = blit.replace = function(A, B, x, y){
+		x = x || 0 ; y = y || 0
+		B.forEach(function(lex, u, v){
+			var cell = A.getCell(u+x, v+y)
+			if (cell) {
+				cell.clone(lex)
+			}
+		})
+	}
+	blit.invert = function(A, B, x, y){
+		x = x || 0 ; y = y || 0
+		B.forEach(function(lex, u, v){
+			var cell = A.getCell(u+x, v+y)
+			if (cell && lex.opacity > 0) {
+				cell.fg = get_inverse(cell.fg)
+				cell.bg = get_inverse(cell.bg)
+			}
+		})
+	}
+	return blit
+})()
-- 
cgit v1.2.3-70-g09d2


From 353f109d60ca9d29af333fe91bc09edd8a69472f Mon Sep 17 00:00:00 2001
From: Jules Laplace <jules@okfoc.us>
Date: Thu, 11 Dec 2014 22:26:08 -0500
Subject: drag a selection around clones/copies it

---
 js/blit.js         | 12 +++++++++++-
 js/ui/selection.js | 14 ++++++++++++--
 2 files changed, 23 insertions(+), 3 deletions(-)

(limited to 'js/blit.js')

diff --git a/js/blit.js b/js/blit.js
index 09f39b2..8683f22 100644
--- a/js/blit.js
+++ b/js/blit.js
@@ -18,7 +18,17 @@ var blit = (function(){
 			}
 		})
 	}
-	blit.set = blit.replace = function(A, B, x, y){
+	// copy the region of A beginning at x,y into B
+	blit.copy_from = function(A, B, x, y){
+		x = x || 0 ; y = y || 0
+		B.forEach(function(lex, u, v){
+			var cell = A.getCell(u+x, v+y)
+			if (cell) {
+				lex.clone(cell)
+			}
+		})
+	}
+	blit.copy_to = function(A, B, x, y){
 		x = x || 0 ; y = y || 0
 		B.forEach(function(lex, u, v){
 			var cell = A.getCell(u+x, v+y)
diff --git a/js/ui/selection.js b/js/ui/selection.js
index 43b1a75..6f8f7db 100644
--- a/js/ui/selection.js
+++ b/js/ui/selection.js
@@ -22,11 +22,14 @@ var selection = (function(){
   // - drag the selection to move it -- this "cuts" it and leaves a blank space on the canvas.
   // - shift-drag the selection to copy it
   
-  var a = [-1, -1]
+  var a = [0, 0]
   var b = [0, 0]
   var c = [0, 0]
   var d = [0, 0]
   
+  function reset () {
+  	a[0] = a[1] = b[0] = b[1] = 0
+  }
   function left (a,b) { return min(a[0],b[0]) }
   function top (a,b) { return min(a[1],b[1]) }
   function right (a,b) { return max(a[0],b[0]) }
@@ -101,7 +104,8 @@ var selection = (function(){
   	if (creating) {
   		orient(a,b)
   		selection_canvas.resize(width(a,b), height(a,b))
-  		// copy canvas here..
+  		blit.copy_from( canvas, selection_canvas, a[0], a[1] )
+  		selection_canvas.build()
       selector_el.classList.remove("creating")
   	}
   	if (moving) {
@@ -111,6 +115,7 @@ var selection = (function(){
       a[1] += dy
       b[0] += dx
       b[1] += dy
+  		blit.copy_to( canvas, selection_canvas, a[0], a[1] )
   	}
   	if (copying) {
   	}
@@ -122,6 +127,11 @@ var selection = (function(){
     selecting = true
   }
   function hide () {
+  	reset()
+    selector_el.style.top = "-9999px"
+    selector_el.style.left = "-9999px"
+    selector_el.style.width = "0px"
+    selector_el.style.height = "0px"
     selecting = false
   }
   
-- 
cgit v1.2.3-70-g09d2