- add paint_app sketch

Author: tabreturn

README.md

@@ -44,7 +44,7 @@ The official source code for the examples, as well as solutions to challenges, f
 
 ## Chapter 11: Mouse and Keyboard Interaction
 
-<a href="chapter-11-mouse_and_keyboard_interaction/scratch_art"><img src="img/ch11-scratch_art.png" height="200" /></a>
+<a href="chapter-11-mouse_and_keyboard_interaction/scratch_art"><img src="img/ch11-scratch_art.png" height="200" /></a><a href="chapter-11-mouse_and_keyboard_interaction/paint_app"><img src="img/ch11-paint_app.png" height="200" /></a>
 
 ## Miscellaneous
 

chapter-11-mouse_and_keyboard_interaction/paint_app/data/Ernest.ttf

@@ -0,0 +1,103 @@
+def setup():
+    size(600, 600)
+    background('#004477')
+    ernest = createFont('Ernest.ttf', 20)
+    textFont(ernest)
+    noLoop()
+    cursor(CROSS)
+
+
+swatches = ['#FF0000', '#FF9900', '#FFFF00', '#00FF00', '#0099FF', '#6633FF']
+brushcolor = swatches[2]
+brushshape = ROUND
+brushsize = 3
+painting = False
+paintmode = 'free'
+palette = 60
+
+
+def draw():
+    print(frameCount)
+    global painting, paintmode
+
+    if mouseX < palette:
+        paintmode = 'select'
+
+    if paintmode == 'free':
+
+        if painting:
+            stroke(brushcolor)
+            strokeCap(brushshape)
+            strokeWeight(brushsize)
+            line(mouseX, mouseY, pmouseX, pmouseY)
+
+        elif frameCount > 1:
+            painting = True
+
+    # black panel
+    noStroke()
+    fill('#000000'); rect(0, 0, palette, height)
+    # color swatches
+    p, p2 = palette, palette/2
+    fill(swatches[0]); square(0, 0, p2)
+    fill(swatches[1]); square(p2, 0, p2)
+    fill(swatches[2]); square(0, p2, p2)
+    fill(swatches[3]); square(p2, p2, p2)
+    fill(swatches[4]); square(0, p, p2)
+    fill(swatches[5]); square(p2, p, p2)
+    # brush preview
+    fill(brushcolor)
+    if brushshape == ROUND:
+        circle(30, 123, brushsize)
+    paintmode = 'free'
+    # clear button
+    fill('#FFFFFF')
+    text('CLEAR', 10, height-12)
+
+
+def mousePressed():
+    # start painting
+    if mouseButton == LEFT:
+        loop()
+    # swatch select
+    if mouseButton == LEFT and mouseX < palette and mouseY < 90:
+        global brushcolor
+        brushcolor = get(mouseX, mouseY)
+
+
+def mouseReleased():
+    # stop painting
+    if mouseButton == LEFT:
+        global painting
+        painting = False
+        noLoop()
+
+
+def mouseWheel(e):
+    # resize the brush
+    global brushsize, paintmode
+    paintmode = 'select'
+    brushsize += e.count
+    if brushsize < 3:
+        brushsize = 3
+    if brushsize > 45:
+        brushsize = 45
+    redraw()
+
+
+def keyPressed():
+    global brushcolor, paintmode
+    paintmode = 'select'
+    # color swatch shortcuts
+    if key.isdigit():
+        k = int(key) - 1
+        if k < len(swatches):
+            brushcolor = swatches[k]
+            redraw()
+
+
+def mouseClicked():
+    # clear canvas
+    if mouseButton == LEFT and mouseX < 60 and mouseY > height-30:
+        fill('#004477')
+        rect(palette, 0, width, height)

chapter-11-mouse_and_keyboard_interaction/paint_app/paint_app.pyde

@@ -0,0 +1,2 @@
+mode=Python
+mode.id=jycessing.mode.PythonMode